phenylselenenylation of an α-diethoxyphosphinyl-γ-butyrolactone carbanion and subsequent oxidative elimination of the phenylseleno residue. The butenolide 2 underwent the Michael addition of various nucleophiles to generate the phosphoryl-stabilized carbanions, which reacted with carbonyl compounds to give α,β-difunctionalized γ-butyrolactones, lignans, and a γ-butyrolactohe annelated compound.
Preparation of E- and Z-α-arylidene-γ-butyrolactones from Z-α-stannylmethylene-γ-butyrolactones: stereoselective synthesis of (±)-savinin and (±)-gadain
作者:Eun Lee、Chang Uk Hur、Young Chun Jeong、Young Ho Rhee、Moon Ho Chang
DOI:10.1039/c39910001314
日期:——
E-α-Arylidene-γ-butyrolactones were prepared by the radical additionâelimination reaction of Z-α-stannylmethylene-γ-butyrolactones, whereas the palladium(0) catalysed cross-coupling reaction of the same substrates afforded Z-α-arylidene-γ-butyrolactones.