Samarium(II) iodide mediated intramolecular reductivecoupling of carbonyl groups and alkynes in the presence of HMPA and t-BuOH was successfully performed to provide cyclized products. Some cyclic compounds containing a heteroatom such as oxygen or nitrogen were also efficiently prepared by this coupling reaction.
Polystyrene-supported benzyl selenide: an efficient reagent for highly stereocontrolled synthesis of olefins and allylic alcohols
作者:Xian Huang、Weiming Xu
DOI:10.1016/s0040-4039(02)00996-6
日期:2002.7
Polystyrene-supported benzyl selenide has been prepared. This novel reagent was treated with LDA to produce a selenium-stabilized carbanion, which reacted with alkyl halide and epoxides, followed by selenoxide syn-elimination, to give olefins and allylic alcohols, respectively. (C) 2002 Elsevier Science Ltd. All rights reserved.