An efficient protocol for the stereoselective dihydroxylation of ene-ester systems
作者:Stephen A. Hermitage、Alison Murphy、Poul Nielsen、Stanley M. Roberts
DOI:10.1016/s0040-4020(98)00800-x
日期:1998.10
Dihydroxylation of ene ester systems was achieved in good yield and diastereoselectivity under classical catalytic OsO4 and NMO conditions using the intrinsic diastereoselectivity in alpha-methyl beta-OTBS systems. This intrinsic diastereoselection can be reversed using 'super' AD-mix to give the opposite diastereomer also in good selectivity. The regioselection of dihydroxylation in diene esters using a modified 'super' AD-mix was poor. This methodology can be applied towards the synthesis of part structures of the marine macrolide Altohyrtin A. (C) 1998 Elsevier Science Ltd. All rights reserved.