Asymmetric Syntheses of (−)-Enterolactone and (7′<i>R</i>)-7′-Hydroxyenterolactone via Organocatalyzed Aldol Reaction
作者:Saumen Hajra、Aswini Kumar Giri、Sunit Hazra
DOI:10.1021/jo900810a
日期:2009.10.16
Short syntheses of (−)-enterolactone (1a) and (7′R)-7′-hydroxyenterolactone (1b) have been achieved utilizing organocatalyzed asymmetric cross-aldol reaction of aldehydes 2 and 3 and base-mediated alkylation of lactones 5 and 4.
α,β-Dibenzyl-γ-butyrolactone lignan alcohols: total synthesis of (±)-7′-hydroxyenterolactone, (±)-7′-hydroxymatairesinol and (±)-8-hydroxyenterolactone
作者:T Mäkelä
DOI:10.1016/s0039-128x(01)00107-6
日期:2001.10
carbon atom and a alpha-hydroxy alpha,beta-dibenzyl-gamma-butyrolactone lignan were synthesized in racemic form using the tandem conjugate addition reaction to construct the basic lignan skeleton. Subsequent reaction steps involved either a catalytic reduction of the regenerated keto group to the alcohol, or a hydrogenolysis to benzylic methylene followed by lactone enolate formation and oxidation