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You searched for: Journal Chemistry of natural compounds Remove constraint Journal: Chemistry of natural compounds Source 2017 v.53 no.6 Remove constraint Source: 2017 v.53 no.6
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1. The Alkaloidal Constituents of Cephalotaxus mannii Collected in Lam Dong Province, Vietnam

Author:
Tran Van Loc; Nguyen Thi Lieu; Tran Thi Phuong Thao; Nguyen Thi Luu; Ho Ngoc Anh; Le Thi Thu Ha; Tran Van Chien; Pham Thi Ninh; Dinh Thi Phong; Tran Van Sung
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1122-1126
ISSN:
0009-3130
Subject:
Cephalotaxus; Fourier transform infrared spectroscopy; alkaloids; electrospray ionization mass spectrometry; isomers; nuclear magnetic resonance spectroscopy; Vietnam
Abstract:
... Eight alkaloidal constituents have been isolated and structurally elucidated from Cephalotaxus mannii Hook. f. collected from the highland Lam Dong Province, Vietnam. They are: cephalotaxine (1), isoharringtonine (2), norisoharringtonine (3), desoxyharringtonine (4), nordesoxyharringtonine (5), cephalotaxine 𝛽 -N-oxide (6), 3-epi-schellhammericine (7), and an isomer of 3-epi-schellhammericine (8) ...
DOI:
10.1007/s10600-017-2214-x

2. Covalent and Ionic Conjugates of Trolox and α-Tocopherol with 1-Aminoadamantane

Author:
Yu. V. Yushkova; S. V. Morozov; E. I. Chernyak; I. A. Grigor’ev
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1059-1065
ISSN:
0009-3130
Subject:
alpha-tocopherol; chemical bonding; mass spectrometry; nuclear magnetic resonance spectroscopy; water solubility
Abstract:
... Covalent, ionic, and ionic-covalent conjugates of trolox and α-tocopherol with 1-aminoadamantane were synthesized. Their structures were elucidated using mass spectrometry and IR, PMR, and ¹³C NMR spectroscopy. The water solubility of the ionic trolox conjugates with 1-aminoadamantane increased by 2–24 times as compared with that of trolox whereas that of the α-tocopherol succinate conjugates rema ...
DOI:
10.1007/s10600-017-2201-2

3. First Ionic Conjugates of Dihydroquercetin Monosuccinate with Amines

Author:
N. V. Mamontova; E. I. Chernyak; E. V. Amosov; Yu. V. Gatilov; V. I. Vinogradova; S. F. Aripova; S. V. Morozov; I. A. Grigor’ev
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1045-1051
ISSN:
0009-3130
Subject:
alkaloids; amines; ammonia; antioxidant activity; free radicals; taxifolin; water solubility
Abstract:
... The reaction of dihydroquercetin monosuccinate with ammonia, a series of alkylamines, and amino-derivatives of heterocyclic compounds including nitroxyl radicals and alkaloids produced the corresponding ionic conjugates, the water solubility of which was 1–2 orders of magnitude greater than that of dihydroquercetin with retention of the high antioxidant activity. ...
DOI:
10.1007/s10600-017-2198-6

4. In vitro Antibacterial Evaluation of 1,2,4-Triazole Compounds Containing Purine Moiety

Author:
Sevdije Govori
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1137-1139
ISSN:
0009-3130
Subject:
antibacterial properties; carbon disulfide; ethanol; formic acid; moieties; nuclear magnetic resonance spectroscopy; potassium hydroxide
Abstract:
... 9H-[1,2,4]Triazolo[4,3-g]purin-5-amine (2) was synthesized by reaction of 6-hydrazinyl-7H-purin-2-amine (1a) with formic acid under reflux conditions. Treating compound 1a in ethanol with CS₂ in the presence of KOH yielded 5-amino-3H-[1,2,4]triazolo[4,3-g]purine-3-thione (3). The new synthesized compounds were characterized using IR, ¹H NMR, and elemental analysis. The synthesized compounds have b ...
DOI:
10.1007/s10600-017-2217-7

5. Isolation of Antimicrobial Peptides from Fritillaria pallidiflora

Author:
Y. Mijiti; P. Rozi; A. Waili; Y. H. Gao; V. V. Maksimov; Zh. F. Ziyavitdinov; A. Yili; Sh. I. Salikhov; H. A. Aisa
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1144-1147
ISSN:
0009-3130
Subject:
Candida albicans; Fritillaria pallidiflora; antimicrobial peptides; antimicrobial properties; electrophoresis; fungi; liquid chromatography; mass spectrometry; molecular weight; polypeptides; seed extracts; seeds
Abstract:
... Polypeptide fractions from seeds of Fritillaria pallidiflora Schrenk were isolated and purified. The peptide compositions and molecular masses were determined using SDS-PAAG electrophoresis and LC-MS analysis. The results showed that the most active fraction of biocidal peptides contained greater than 20 constituents with molecular masses in the range of 1050–4727.2 Da. The isolated peptide fracti ...
DOI:
10.1007/s10600-017-2219-5

6. A New Amide and Antioxidant Constituents of Piper taiwanense

Author:
Jih-Jung Chen; Shih-Wei Wang; Chun-Lin Chen; Yueh-Hsiung Kuo; Ming-Jen Cheng; Tsung-Hsien Chang; Ping-Jyun Sung; Wen-Lung Kuo; Yun-Ping Lim
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1117-1121
ISSN:
0009-3130
Subject:
2,2-diphenyl-1-picrylhydrazyl; Piper; aerial parts; alkaloids; antioxidant activity; decolorization; free radical scavengers; plant extracts; spectroscopy; vitamin content
Abstract:
... A new amide, pipertaiwanamide (1), has been isolated from the aerial part of Piper taiwanense, together with four known compounds, taiwanamide A (2), taiwanamide B (3), 1-cinnamoylpyrrolidine (4), and N-cinnamoyltyramine (5). The structure of the new compound 1 was determined through spectroscopic and MS analyses. Pipertaiwanamide (1) and N-cinnamoyltyramine (5) exhibited free radical scavenging a ...
DOI:
10.1007/s10600-017-2213-y

7. A New Flavonoid Glycoside from Viburnum macrocephalum f. keteleeri

Author:
Xiao-Qing Xu; Xu-Hua Huang; Jia Chen; Jian-Hua Shao; Chun-Chao Zhao
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1035-1037
ISSN:
0009-3130
Subject:
Viburnum; chromatography; flavonoids; glycosides; spectral analysis
Abstract:
... A new flavonoid glycoside 1, along with seven known compounds (2–8), was isolated from Viburnum macrocephalum f. keteleeri by repeated column chromatography. Its structure was identified as apigenin-7-O-[6-O-(5-methoxy-3-hydroxy-3-methyl-5-oxovaleryl)]-β-D-glucopyranoside (1) by spectral analysis. ...
DOI:
10.1007/s10600-017-2196-8

8. A New Lignan Glucoside from Cyclea racemosa

Author:
Jian-Hua Shao; Xue-Wei Zhang; Zi-Ling Dong; Si-Hui Li; Ben-Jie Miao; Ke-Zhi Cheng
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1025-1027
ISSN:
0009-3130
Subject:
Cyclea; chemical structure; glucosides; lignans; spectral analysis
Abstract:
... A new lignan glucoside 1, along with two known lignans (2, 3), was isolated from Cyclea racemosa Oliv. Its structure was elucidated as (+)-7′-methoxylariciresinol 4-O-β-D-glucopyranoside on the basis of extensive spectroscopic analyses. ...
DOI:
10.1007/s10600-017-2193-y

9. New Steroidal Glycosides from Pericarp of Digitalis ferruginea

Author:
A. V. Skhirtladze; T. A. Kopaliani; V. G. Nebieridze; E. P. Kemertelidze; Markus Ganzera
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1083-1087
ISSN:
0009-3130
Subject:
Digitalis ferruginea; fruit extracts; glycosides; pericarp
Abstract:
... Nine steroidal compounds, three of which were new (two furostanol and one spirostanol glycosides), were isolated from pericarp of Digitalis ferruginea L. fruit. ...
DOI:
10.1007/s10600-017-2206-x

10. A New Sydonic Acid Derivative From a Marine Derived-Fungus Aspergillus sydowii

Author:
Xiuli Xu; Shujiang Zhao; Liyuan Yin; Ying Yu; Zhengkun Chen; Huihui Shen; Li Zhou
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1056-1058
ISSN:
0009-3130
Subject:
Aspergillus; Candida albicans; Staphylococcus aureus; antibacterial properties; mass spectrometry; nuclear magnetic resonance spectroscopy; spectral analysis
Abstract:
... Methyl (3-hydroxy-4-(2-hydroxy-6-methylheptan-2-yl)benzoyl)glycinate (1), a new sydonic acid derivative with glycinate, together with sydonic acid (2), sydowic acid (3), and 7-deoxy-7,14-didehydrosydonic acid (4), were isolated from a marine-derived Aspergillus sydowii strain CUGB-F126. Their structures were elucidated by spectroscopic analysis, including high-resolution mass spectroscopy, and 1D ...
DOI:
10.1007/s10600-017-2200-3

11. A New Triterpenoid from Ixeris chinensis

Author:
Qing-hu Wang; Cui-lan Bai; Jing-jing Han; Bai-yinmu-qi-er Bao
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1080-1082
ISSN:
0009-3130
Subject:
Asteraceae; chemical structure; ethyl acetate; nuclear magnetic resonance spectroscopy; plant extracts; triterpenoids
Abstract:
... A new triterpenoid, namely 3β-(2-methoxy-5-formylphenoxy)-erythrodiol (1), was isolated from the EtOAc extract of Ixeris chinensis. The structures of 1 was elucidated by spectroscopic methods, including UV, IR, HR-ESI-MS, and extensive 1D and 2D NMR techniques. ...
DOI:
10.1007/s10600-017-2205-y

12. New Triterpenoids from the Leaves of Alafia barteri

Author:
Abdulmumeen A. Hamid; Olapeju O. Aiyelaagbe; Arvind S. Negi; Suaib Luqman; Fatima Kaneez
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1075-1079
ISSN:
0009-3130
Subject:
Apocynaceae; acetates; cytotoxicity; inhibitory concentration 50; leaves; lupane; mass spectrometry; neoplasm cells; nuclear magnetic resonance spectroscopy; stigmasterol; viability
Abstract:
... A new oleanane derivative, 3β-acetyloleana-5,12-dien-2,23-diol (1), and a new lupane compound, lup-11,20(29)-dien-3 β,28-diol (2), together with eight known compounds, oleana-5,12-dien-3β-yl acetate (3), lup-5,20(29)-dien-3 β -yl acetate (4), 18-methylethylnonadecan-19-oic-9-enoate (6), octadecane (5), cis-pentadec-7-enoic acid (7), cis-tetradec-7,10-dienoic acid (8), cholest-4-en-3-one (9), and s ...
DOI:
10.1007/s10600-017-2204-z

13. Reaction of Halogenated Uracils with KI

Author:
I. B. Chernikova; L. V. Spirikhin; M. F. Abdullin; M. S. Yunusov
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1140-1143
ISSN:
0009-3130
Subject:
chemical reactions; chemical structure; methanol; sulfuric acid
Abstract:
... Treatment of 5-iodo-1,3,6-trimethyluracil or 5-bromo-1,3,6-trimethyluracil with H₂SO₄ (5%) in the presence of an excess of KI at 80°C for 5 h produced 1,3,6-trimethyluracil as the only product. Analogous treatment of N-bromo-6-iodomethyluracil gave a mixture with 5-bromo-6-iodomethyluracil as the main constituent. The reaction with an excess of KI in MeOH at 50°C formed 5-bromo-6-hydroxymethylurac ...
DOI:
10.1007/s10600-017-2218-6

14. Secondary Metabolites from Alternaria sp., a Fungal Endophyte Isolated from the Seeds of Ziziphus jujuba

Author:
Raha S. Orfali; Weaam Ebrahim; Azza M. El-Shafae
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1031-1034
ISSN:
0009-3130
Subject:
Alternaria; Ziziphus jujuba; alkaloids; culture media; cytotoxicity; endophytes; fungi; inhibitory concentration 50; liquids; medicinal plants; mice; neoplasm cells; nuclear magnetic resonance spectroscopy; polyketides; rice; secondary metabolites; seeds; Uzbekistan
Abstract:
... From the seeds of the traditional medicinal plant Ziziphus jujuba growing in Uzbekistan, the fungal endophyte Alternaria sp. was isolated. Extracts of this fungus grown on solid rice and liquid Wickerham culture media yielded 21 natural products. These natural products include the new phthalide natural product (±)7-methoxyphthalide-3-acetic acid (1) in addition to 20 known compounds including 19 p ...
DOI:
10.1007/s10600-017-2195-9

15. Spireasalicin, a New Acylated Quercetin Glycoside from Spiraea salicifolia

Author:
D. N. Olennikov; N. I. Kashchenko
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1038-1044
ISSN:
0009-3130
Subject:
Spiraea; alpha-glucosidase; flowering; glycosides; mass spectrometry; nuclear magnetic resonance spectroscopy; phenolic compounds; plant anatomy; quercetin; screening
Abstract:
... A new acylated quercetin glycoside and 36 known compounds were isolated from flowering runners of Spiraea salicifolia L. (Rosaceae). The structures of the new glycoside quercetin-3-O-[6″-(4‴-hydroxy-2‴-methylenebutyroyl)]-β-D-glucopyranoside (spireasalicin, 1) and the 36 known compounds were elucidated using UV, IR, and NMR spectroscopy and mass spectrometry. The biological screening of the isolat ...
DOI:
10.1007/s10600-017-2197-7

16. Stereoselective Synthesis of Pear Ester

Author:
R. N. Shakhmaev; A. Sh. Sunagatullina; D. A. Akimova; V. V. Zorin
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1017-1019
ISSN:
0009-3130
Subject:
cross-coupling reactions; esters; oxidation; pears; stereoselective synthesis
Abstract:
... A simple two-step synthesis of ethyl-(2E,4Z)-deca-2,4-dienoate based on Fe-catalyzed cross-coupling of ethyl-(2E,4Z)-5-chloropenta-2,4-dienoate, which was obtained via one-pot oxidation and olefination of readily available (2Z)-3-chloroprop-2-en-1-ol by n-pentylmagnesiumbromide, was developed. ...
DOI:
10.1007/s10600-017-2191-0

17. Steroidal Saponin from Allium porrum

Author:
L. N. Gvazava; A. V. Skhirtladze
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1093-1095
ISSN:
0009-3130
Subject:
Allium porrum; chemical structure; fractionation; spectral analysis; steroid saponins
Abstract:
... A new steroidal glycoside (1) was isolated by fractionation of total extracted substances from Allium porrum. Its structure was determined as (25R)-5α-spirostan-3β,6β-diol-12-one 3-O-β-D-glucopyranosyl-(1→2)-[β-D-fucopyranosyl-(1→3)]-β-D-glucopyranosyl-(1→4)-β-D-galactopyranoside using chemical transformations, physical constants, and spectral data. ...
DOI:
10.1007/s10600-017-2208-8

18. Structural Characterization of a New Sesquiterpene from the Fungal Strain Monascus kaoliang

Author:
Ming-Jen Cheng; Ming-Der Wu; Hing-Yuen Chan; Jih-Jung Chen; Yen-Lin Chen; Ih-Sheng Chen; Yu-Ming Hsu; Gwo-Fang Yuan
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1072-1074
ISSN:
0009-3130
Subject:
Monascus kaoliang; fungi; nuclear magnetic resonance spectroscopy; red yeast rice; rice; sesquiterpenoids; spectral analysis
Abstract:
... A new sesquiterpene derivative, 10-methoxythujopsene (1), was isolated from the red mould rice of Monascus kaoliang. The structure was determined by extensive NMR and MS spectroscopic analysis. The relative configuration of 1 was established by the use of ROESY spectroscopic data. ...
DOI:
10.1007/s10600-017-2203-0

19. Structural Elucidation of a New Flavolignan Acylglycoside from Fallen Needles of Pinus banksiana

Author:
Cui-Yun Liu; Dan-Ni Xie; Liang-Liang An; Zi-Jiang Li; Chuan-Ling Si; Young-Soo Bae; Gang Xu; Lei Wu
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1020-1024
ISSN:
0009-3130
Subject:
Pinus banksiana; chromatography; conifers; ellagic acid; glycosides; kaempferol; nuclear magnetic resonance spectroscopy; quercetin; secondary metabolites
Abstract:
... A new flavolignan acylglycoside, namely phillygenin 4-O-(2′′-trans-cinnamoyl)-α-L-rhamnopyranoside (1), along with a known phenolic acid (ellagic acid, 2) and three known flavonol glycosides (kaempferol 3-O-β-D-glucopyranoside (3), kaempferol 3-O-α-L-rhamnopyranoside (4), and quercetin 3-O-β-D-glucopyranoside (5), was isolated and purified from the fallen needles of Pinus banksiana by repeated col ...
DOI:
10.1007/s10600-017-2192-z

20. Synthesis and Analgesic Activity of 4,7-Dimethyl-3,4,4a,5,8,8a-Hexahydro-2-Chromen-4,8-Diols Containing Alkyl-Substituted Aromatic Moieties

Author:
O. S. Patrusheva; A. V. Pavlova; D. V. Korchagina; T. G. Tolstikova; K. P. Volcho; N. F. Salakhutdinov
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1066-1071
ISSN:
0009-3130
Subject:
analgesic effect; aromatic compounds; benzaldehyde; heterocyclic compounds; moieties; monoterpenoids; stereoselectivity
Abstract:
... A series of new heterocyclic compounds with the hexahydro-2H-chromene skeleton were prepared by reacting the monoterpenoid para-mentha-1,8-diene-5,6-diol with 4-alkyl-substituted aromatic aldehydes. Adding small alkyl substituents (methyl and ethyl) to the aldehyde aromatic ring increased the yields of hexahydrochromenes as compared with the analogous reaction with benzaldehyde. However, adding a ...
DOI:
10.1007/s10600-017-2202-1

21. Synthesis and Analgesic Activity of 5,7- and 6-Substituted Diazaadamantanes Containing Monoterpene Moieties

Author:
K. Yu. Ponomarev; E. A. Morozova; E. V. Suslov; D. V. Korchagina; T. G. Tolstikova; K. P. Volcho; N. F. Salakhutdinov
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1131-1136
ISSN:
0009-3130
Subject:
aldehydes; analgesic effect; analgesics; moieties; monoterpenoids; structure-activity relationships
Abstract:
... A series of new compounds combining diazaadamantane and monoterpene moieties that were analogs of highly potent analgesic substituted 5,7-dimethyl-1,3-diazaadamantan-6-ones were prepared by reacting 1,5-diethyl- and 1,5-dipropyl-3,7-diazabicyclo[3.3.1]nonan-9-ones with monoterpenoid aldehydes. Another two structural analogs of these compounds were synthesized by reducing the carbonyl. The biologic ...
DOI:
10.1007/s10600-017-2216-8

22. Synthesis and Antifungal Activity of Cuminic Acid Derivatives

Author:
Jian Yang; Yang Gao; Hui Liu; Xiaorong Tang
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1112-1116
ISSN:
0009-3130
Subject:
Bipolaris maydis; Botrytis cinerea; Coniothyrium; Fusarium graminearum; Sclerotinia sclerotiorum; Thanatephorus cucumeris; X-ray diffraction; antifungal properties; carbendazim; crystal structure; plant pathogenic fungi
Abstract:
... A series of benzamide derivatives (compounds 1–29) was synthesized based on the lead compound cuminic acid. The crystal structure of compound 11 was characterized by single crystal X-ray diffraction. The antifungal activity of the synthesized compounds was determined against seven plant pathogenic fungi, namely Rhizoctonia solani, Gibberella zeae, Helminthosporium maydis, Sclerotinia sclerotiorum, ...
DOI:
10.1007/s10600-017-2212-z

23. Synthesis and Antimicrobial Activity of Dihydrobetulin N-Acetylglucosaminides

Author:
I. Yu. Strobykina; B. F. Garifullin; R. R. Sharipova; A. D. Voloshina; A. S. Strobykina; A. B. Dobrynin; V. E. Kataev
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1101-1106
ISSN:
0009-3130
Subject:
Gram-negative bacteria; Staphylococcus aureus; antibacterial properties; fungi; glycosides
Abstract:
... Dihydrobetulin N-acetylglucosaminides were synthesized for the first time. A study of their antimicrobial activity against a standard set of Gram-positive and Gram-negative bacteria and fungi showed highly selective bacteriostatic activity for glycosides 9 and 13 against Staphylococcus aureus ATCC 209p. ...
DOI:
10.1007/s10600-017-2210-1

24. Synthesis and Antimicrobial Activity of Glucuronosyl Derivatives of Steviolbioside from Stevia rebaudiana

Author:
R. R. Sharipova; O. V. Andreeva; I. Yu. Strobykina; A. D. Voloshina; A. S. Strobykina; V. E. Kataev
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1107-1111
ISSN:
0009-3130
Subject:
Stevia rebaudiana; antibacterial properties; chloramphenicol; glycosides; minimum inhibitory concentration
Abstract:
... Glucuronosyl derivatives of the glycoside steviolbioside from Stevia rebaudiana were synthesized for the first time. Steviolbioside exhibited selective bacteriostatic and bactericidal activity against S. aureus ATCC 209p with minimum inhibitory concentration (MIC) of 62.5 μg/mL, which corresponded to the activity of the antibiotic chloramphenicol. ...
DOI:
10.1007/s10600-017-2211-0

25. Synthesis and Antiviral Activity of Glycyrrhizic-Acid Conjugates with Aromatic Amino Acids

Author:
L. A. Baltina Jr; A. I. Fairushina; L. A. Baltina; M. Yu. Eropkin; N. I. Konovalova; P. A. Petrova; E. M. Eropkina
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1096-1100
ISSN:
0009-3130
Subject:
antiviral properties; Human alphaherpesvirus 1; salts; glycyrrhizin; Orthomyxoviridae; tryptophan; tyrosine; triterpenoids; sodium; viruses; phenylalanine; herpes simplex
Abstract:
... Amino-acid conjugates of glycyrrhizic acid (GA) containing phenylalanine, tyrosine, and tryptophan in the carbohydrate and triterpene parts were synthesized using N-hydroxybenzotriazole (HOBt)-N,N′-dicyclohexylcarbodiimide (DCC) and sodium salts of the amino acids. GA conjugates containing two aminoacid residues in the glycoside carbohydrate part were synthesized using N-ethoxycarbonyl-2-ethoxy-1, ...
DOI:
10.1007/s10600-017-2209-7

26. Synthesis and Characterization of Novel Heterocyclic Compounds Containing the Benzoxazine Ring by 7-Hydroxycoumarin

Author:
S. Ali-Asgari; M. Moradi; E. Maskani; B. Mirtamizdoust
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1028-1030
ISSN:
0009-3130
Subject:
condensation reactions; coumarin; formaldehyde; phenol; primary amines; umbelliferones
Abstract:
... Benzoxazine derivatives are typically synthesized by condensation reaction of a phenol with two equivalents of formaldehyde and various primary amines (aliphatic or aromatic) as starting materials either by employing solution or solvent-free conditions. In this work, coumarin Mannich bases were synthesized using 7-hydroxycoumarin as phenol and were obtained with moderate to very good yields. ...
DOI:
10.1007/s10600-017-2194-x

27. Synthesis of 20-Hydroxyecdysone Carboxylate Esters

Author:
I. D. Bobaev; I. V. Zavarzin; A. N. Blinnikov; Kh. M. Bobakulov; N. Sh. Ramazanov; N. D. Abdullaev
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1088-1092
ISSN:
0009-3130
Subject:
acylation; anhydrides; chemical derivatives; ecdysterone; esters; organic acids and salts
Abstract:
... Acylation of 20-hydroxy-2,3-O-isopropylideneecdysone (2) by carboxylic-acid anhydrides produced ecdysteroid derivatives containing various organic acids (5–12). ...
DOI:
10.1007/s10600-017-2207-9

28. Two New Alkaloids from the Seeds of Cassia alata and Their Anti-Tobacco Mosaic Virus Activity

Author:
Yan Yang; Shan-Zhai Shang; Wei Zhao; Huan-huan Xing; Hang-Ying Ma; Ling Zhou; Min Zhou; Yan-Qing Ye; Hai-Yan Wu; Gang Du; Dong-Lai Zhu; Qiu-Fen Hu
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1127-1130
ISSN:
0009-3130
Subject:
Senna alata; alkaloids; antiviral properties; chemical structure; nuclear magnetic resonance spectroscopy; seed extracts; seeds; spectral analysis; viruses
Abstract:
... Two new alkaloids, 3-(hydroxymethyl)-6,9-dimethyl-7H-benzo[de]quinolin-7-one (1) and 3-(hydroxymethyl)-8-methoxy-6,9-dimethyl-7H-benzo[de]quinolin-7-one (2), together with two known alkaloids (3 and 4) were isolated from the seeds of Cassia alata. Their structures were determined by means of HR-ESI-MS and extensive 1D and 2D NMR spectroscopic studies. Compounds 1–4 were tested for their anti-tobac ...
DOI:
10.1007/s10600-017-2215-9

29. Two New Xanthones From Swertia atroviolacea and Their Anti-5α-Reductase Activity

Author:
Huan-huan Xing; Neng-Jun Xiang; Li-Xuang Liu; Guo-Rong Yang; Yan-Fei Shen; Yan Yang; Ling Zhou; Hang-Ying Ma; Min Zhou; Hai-Yan Wu; Gan-Peng Li; Qiu-Fen Hu
Source:
Chemistry of natural compounds 2017 v.53 no.6 pp. 1052-1055
ISSN:
0009-3130
Subject:
Swertia; enzyme activity; metabolites; spectral analysis; xanthones
Abstract:
... Two new xanthones, atroxanthones A and B (1 and 2), together with four known xanthones (3–6), were isolated from the whole herb of Swertia atroviolacea. The structures of the metabolites were established on the basis of detailed spectroscopic analysis. Compounds 1 and 2 were evaluated for their anti-5α-reductase activity. The results revealed that 1 and 2 had weak activity with reductase inhibitio ...
DOI:
10.1007/s10600-017-2199-5