Ligand exchange reaction of sulfoxides in organic synthesis: A new synthesis of α-chloroketones from carbonyl compounds with one-carbon homologation
作者:Tsuyoshi Satoh、Yasuhiro Mizu、Taku Kawashima、Koji Yamakawa
DOI:10.1016/0040-4020(94)00989-8
日期:1995.1
A new procedure for one-carbon homologation of carbonyl compounds to α-chloroketones is described. Addition of the carbanion of dichloromethyl phenyl sulfoxide with ketones and aldehydes gave the adducts, chloro alcohols, in good yields. Treatment of the chloro alcohols with EtMgBr or lithium diisopropylamide gave one-carbon homologated α-chloroketones via β-oxido carbenoid rearrangement in moderate
描述了一种将羰基化合物一碳均化为α-氯酮的新方法。二氯甲基苯基亚砜与酮和醛的碳负离子加成后,以良好的收率得到加合物氯醇。用EtMgBr或二异丙基氨基化锂处理氯醇,可通过β-氧化类胡萝卜素重排以中等至良好的收率得到一碳同系的α-氯酮。通过由甲基酯和氯甲基苯基亚砜合成的α-氯代α-亚砜基酮的亚磺酰基与EtMgBr的配体交换反应,实现了酯与α-氯代酮的一碳同系化。