Unsaturated γ-hydroxy ketones 3 and γ-hydroxy nitriles 7 are readily converted into 4-oxo esters 4 and 3-cyano esters 8 by means of a Claisen−Johnson orthoester rearrangement, using triethyl orthoacetate in xylene at reflux. The obtained ester derivatives can be selectively reduced at the carbonyl and cyano groups to afford the corresponding lactones 5 and pyrrolidinones 14.
Convenient procedure of Horner–Wadsworth–Emmons olefination for the synthesis of simple and functionalized α,β-unsaturated nitriles
作者:Alessandra Lattanzi、Liliana R. Orelli、Patrizia Barone、Antonio Massa、Patrizia Iannece、Arrigo Scettri
DOI:10.1016/s0040-4039(02)02880-0
日期:2003.2
A mild and practical procedure of Horner-Wadsworth-Emmons olefination promoted by lithium hydroxide and alpha-cyano phosphonates has been set up for the synthesis of alpha,beta-unsaturated nitrites. The reaction conditions are tolerated by functionalized ketones and the exclusive formation of E-gamma-hydroxy alpha,beta-unsaturated nitrites has been observed. (C) 2003 Elsevier Science Ltd. All rights reserved.
Preparation of 4-hydroxy-2-alkenenitriles from phrnylsulfinylacetonitrile with keetones or aldehydes, and its synthetic application to substituted furans