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Synthesis of brassinosteroids analogues from laxogenin and their plant growth promotion
- Wang, Qi, Xu, Jing, Liu, XiaoLi, Gong, WenXiu, Zhang, CunLi
- Natural product research 2015 v.29 no.2 pp. 149-157
- bioassays, brassinosteroids, chemical derivatives, cotyledons, growth promotion, hypocotyls, plant growth, radishes, steroid saponins, synthesis
- Four steroid saponins (2 – 5) and three derivatives (6 – 8) were synthesised from laxogenin. Four of them were new compounds: (25 R)-3β - (2,3,4,6-tetra- O -acetyl-β- d -galactopyranosyloxy)-5α-spirostan-6-one (3), (25 R)-3β-(β- d -galactopyranosyloxy)-5α-spirostan-6-one (5), 3β,16-diacetyl-26-hydroxy-5α-cholestan-6,22-dione (6) and 16-acetyl-3β,26-dihydroxy-5α-cholestan-6,22-dione (7). All the compounds showed plant growth-promoting activity in the radish hypocotyl elongation and cotyledon expansion bioassay. Above all, 2 and 6 were found to be more active.