Catalytic Enantioselective Aldol Reactions of Unprotected Carboxylic Acids under Phosphine Oxide Catalysis
作者:Shunsuke Kotani、Yusaku Yoshiwara、Masamichi Ogasawara、Masaharu Sugiura、Makoto Nakajima
DOI:10.1002/anie.201810599
日期:2018.11.26
The first catalytic enantioselective aldol reaction of various unprotected carboxylic acids is described. In the presence of a chiral bis(phosphine oxide) as a Lewis base catalyst, carboxylic acids were activated with silicon tetrachloride to form the corresponding bis(trichlorosilyl)enediolates in situ, which subsequently underwent an aldol reaction with an aldehyde or a ketone to produce β‐hydroxycarboxylic
描述了各种未保护的羧酸的第一催化对映选择性醛醇缩合反应。在手性双(氧化膦)作为路易斯碱催化剂的存在下,用四氯化硅活化羧酸以原位形成相应的双(三氯甲硅烷基)亚乙基二醇酯,随后将其与醛或酮进行醛醇缩合反应以生成高达92%ee的高对映选择性的β-羟基羧酸。