The Favorskii rearrangement of α-chloro β-keto sulfones, which are easily synthesized from aldehydes and ketones, with amines gives β-sulfonyl amides in good yield. These β-sulfonyl amides are converted to amides and α,β-unsaturated amides by reduction or elimination of the sulfonyl group.
Lithium-chlorine exchange of α-chloro α-sulfonyl ketones, easily prepared from 1-chloroalkyl aryl sulfoxides and aldehydes in good yields, with n-butyllithium gave α-sulfonyl ketones in high yields. Some trials to trap the enolate intermediate were carried out.
1-Chloroalkyl p-tolyl sulfoxides as useful agents for homologation of carbonyl compounds: conversion of carbonyl compounds to .alpha.-hydroxy acids, esters, and amides and .alpha.,.alpha.'-dihydroxy ketones
作者:Tsuyoshi Satoh、Kenichi Onda、Koji Yamakawa
DOI:10.1021/jo00013a011
日期:1991.6
One-carbon homologation of carbonyl compounds to alpha-hydroxy acids, esters, and amides by the use of 1-chloroalkyl p-tolyl sulfoxide as a hydroxycarbonyl anion equivalent is reported. Oxidation of the vinyl chlorides, the intermediates of the above-mentioned method, with osmium tetraoxide gives alpha,alpha'-dihydroxy ketones which are found in biologically active natural products such as cortisone and adriamycin.
A novel synthesis of haloalkenes from aldehydes with carbon-carbon coupling
Treatment of alpha-halo beta-mesyloxy sulfoxides, easily synthesized from aldehydes and 1-haloalkyl aryl sulfoxides in two steps, with n-BuLi at -78-degrees-C gives haloalkenes in good yields.
SATOH, TSUYOSHI;ONDA, KEN-ICHI;YAMAKAWA, KOJI, J. ORG. CHEM., 56,(1991) N3, C. 4129-4134