Novel Functionalized Trisubstituted Allylboronates via Hosomi−Miyaura Borylation of Functionalized Allyl Acetates
摘要:
A series of novel functionalized achiral and chiral allylboronates have been synthesized via the nucleophilic addition of boronates on allyl acetates derived via vinylalumination or Baylis-Hillman reaction of aldehydes. These reagents, upon allylboration with aldehydes, furnish,beta-substituted-alpha-methylene-gamma-butyrolactones stereoselectively.
A new stereospecific synthesis of unusual (Z)-β-branched Baylis-Hillman adducts
作者:Guigen Li、Han-Xun Wei、Steven Willis
DOI:10.1016/s0040-4039(98)00850-8
日期:1998.6
A new method has been developed for the stereospecific synthesis of unusual (Z)-β-branched Baylis-Hillman adducts with high selectivity (>99 %) in modest to good yields. The process involves successful formation of anionic β-substituted [α-(alkoxycarbonyl)vinyl]aluminum intermediates and their coupling with aldehydes and ketones catalyzed by n-Bu2BOTf at −78 °C.
A series of novel functionalized achiral and chiral allylboronates have been synthesized via the nucleophilic addition of boronates on allyl acetates derived via vinylalumination or Baylis-Hillman reaction of aldehydes. These reagents, upon allylboration with aldehydes, furnish,beta-substituted-alpha-methylene-gamma-butyrolactones stereoselectively.