Catalytic Effect of Five-Coordinate Organotin Bromide or Tetraphenylstibonium Bromide on the Chemo- and Stereoselective Addition of Tin Enolate to<i>α</i>-Halo Ketone
作者:Makoto Yasuda、Tatsuhiro Oh-hata、Ikuya Shibata、Akio Baba、Haruo Matsuda、Noboru Sonoda
DOI:10.1246/bcsj.68.1180
日期:1995.4
tetraphenylstibonium bromide, similarly promoted the selective addition of tin enolates to the carbonyl moiety in α-halo ketones. The reaction with 2-chlorocyclohexanones and the enolates gave chlorohydrins bearing chloro- and hydroxyl groups in the cis-conformation. Chemoselective carbonyl addition to acyclic α-halo ketones was followed by effective cyclization to 2-(2-oxoethyl)oxiranes. The structural and bonding
两种类型的催化剂,五配位有机锡溴化物和四苯基溴化锑,同样促进了烯醇锡选择性加成到 α-卤代酮的羰基部分。与 2-氯环己酮和烯醇化物的反应得到带有顺式构象的氯和羟基的氯代醇。化学选择性羰基加成到无环 α-卤代酮,然后有效环化成 2-(2-氧乙基) 环氧乙烷。两种催化剂的结构和键合类比可能是导致化学和立体选择性加成的相似催化活性的原因。