Synthesis and reactions of chiral 5-substituted (Z)-ethyl 2-bromo-3-(1,3-dioxolan-4-yl)-2-propenoates
摘要:
Wittig olefination of the aldehydes 2a/b gave the 2-bromo-dienes 3a/b. Regioselective catalytic Sharpless asymmetric dihydroxylation (AD) led to the diols 4a/b with high enantiomeric excess (ee > 94%). Cascade reactions of 5a/b with dienolate 6 yielded 7a/b with excellent diastereomeric excess(de > 95%). (C) 1997 Elsevier Science Ltd.
作者:Valentina A. Kobelevskaya、Alexander V. Popov、Sergey V. Zinchenko、Alexander Yu. Rulev
DOI:10.1002/ejoc.202000893
日期:2020.9.14
One isomer or another! Chemo‐ and stereoselectivity of dienoates bromination depends strongly on the substituent nature in starting ester and reaction conditions.