A New Type of Catalytic Tandem 1,4-Addition−Aldol Reaction Which Proceeds through an (Oxa-π-allyl)rhodium Intermediate
作者:Kazuhiro Yoshida、Masamichi Ogasawara、Tamio Hayashi
DOI:10.1021/ja0271025
日期:2002.9.1
The reaction of 9-aryl-9-borabicyclo[3.3.1]nonanes (B-Ar-9BBN) with alpha,beta-unsaturated ketones and aldehydes in the presence of 3 mol % [Rh(OMe)(cod)](2) in toluene at 20 degrees C for 2 h gave high yields of the tandem 1,4-addition-aldol reaction products with high syn selectivity. The reaction proceeds through the catalytic cycle consisting of 1,4-addition of an organorhodium species to an alpha
在 3 mol % [Rh(OMe)(cod)](2) 存在下,9-芳基-9-硼双环 [3.3.1] 壬烷 (B-Ar-9BBN) 与 α,β-不饱和酮和醛的反应) 在 20 摄氏度的甲苯中持续 2 小时,以高顺式选择性获得高产率的串联 1,4-加成-羟醛反应产物。该反应通过催化循环进行,该催化循环包括有机铑物质与 α,β-不饱和酮的 1,4-加成反应以及所得(氧杂-π-烯丙基)铑中间体与醛的醛醇加成反应。