Palladium-Catalyzed Deracemization of Allylic Carbonates in Water with Formation of Allylic Alcohols: Hydrogen Carbonate Ion as Nucleophile in the Palladium-Catalyzed Allylic Substitution and Kinetic Resolution
作者:Bernhard J. Lüssem、Hans-Joachim Gais
DOI:10.1021/ja034109t
日期:2003.5.1
carbonates, with formation of the corresponding allylic alcohols. The palladium-catalyzed reaction of racemic cyclic allylic acetates with potassium hydrogen carbonate in water in the presence of the chiral bisphosphane proceeds with a highly selective kinetic resolution to give the corresponding allylic alcohols and allylic acetates.
在 N,N'-(1R,2R)-1,2-环己烷二基双[2-(二苯基膦基)苯甲酰胺]存在下,钯催化的外消旋环状和非环状烯丙基甲基碳酸酯在水中的脱消旋反应具有高对映选择性,得到相应的烯丙醇收率很高。这种去外消旋涉及钯催化的烯丙基取代与原位形成的碳酸氢根离子和中间体烯丙基碳酸氢盐的不可逆分解,形成相应的烯丙醇。在手性双膦存在下,外消旋环状烯丙乙酸酯与碳酸氢钾在水中的钯催化反应以高度选择性的动力学拆分进行,得到相应的烯丙醇和乙酸烯丙酯。