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Chemoselective Intramolecular Carbonyl Ylide Formation through Electronically Differentiated Malonate Diesters

Author:
Nakhla, Mina C., Lee, Che-Wah, Wood, John L.
Source:
Organic letters 2015 v.17 no.23 pp. 5760-5763
ISSN:
1523-7052
Subject:
alkynes, catalysts, catalytic activity, chemical reactions, chemical structure, chemoselectivity, diastereoselectivity, diazo compounds
Abstract:
A method for chemoselective carbonyl ylide formation utilizing the Rh(II) catalyzed decomposition of electronically differentiated diazo malonates is disclosed. Treatment of ethyl, trifluoro ethyl diazo malonate with a Rh(II) catalyst selectively forms a carbonyl ylide from the relatively electron rich ethyl ester. This carbonyl ylide can be trapped by various alkynes giving highly functionalized oxabicyclic compounds in a chemo-, regio-, and diastereoselective fashion.
Agid:
5789955