A palladium-catalyzed construction of enantiomerically pure α-methylene-γ-butyrolactones. Enantiospecific synthesis of both enantiomers of methylenolactocin
作者:Guoxin Zhu、Xiyan Lu
DOI:10.1016/0957-4166(95)00096-8
日期:1995.4
Opticallyactive β,γ-disubstituted-α-methylene-γ-butyrolactones were synthesized by palladium(II)-catalyzed cyclization reactions of homochiral allylic 2-alkynoates. The reaction was applied to the totalsynthesis of methylenolactocin in both enantiomeric forms.
Stereoselective Synthesis of β-(Hydroxymethylaryl/alkyl)-α-methylene-γ-butyrolactones
作者:David M. Hodgson、Eric P. A. Talbot、Barry P. Clark
DOI:10.1021/ol200711f
日期:2011.5.20
Zinc or a chromium(II) source with 3-(bromomethyl)furan-2(5H)-one (3) and an aldehyde gives beta-(hydroxymethylaryl/alkyl)-alpha-methylene-gamma-butyrolactones 5 in good yields and high diastereoselectivities. The methodology is demonstrated in concise syntheses of (+/-)-hydroxymatalresinol (8) and (+/-)-methylenolactocin (10) by subsequent arylboronate conjugate addition and translactonization, respectively.