作者:Dong Zhang、Jeff A. Celaje、Alon Agua、Chad Doan、Timothy Stewart、Robert Bau、Matthias Selke
DOI:10.1021/ol101122u
日期:2010.7.2
dialkylbiarylphosphines react with singlet oxygen to form phosphine oxides and phosphinate esters. For mixed arylphosphines, the most electron-rich aryl group migrates to form the phosphinate, while for dialkylbiarylphosphines migration of the alkyl group occurs. Dialkylbiarylphosphines also yield arene epoxides, especially in electron-rich systems. Phosphinate ester formation is increased at high temperature, while
芳基膦和二烷基二芳基膦与单线态氧反应形成氧化膦和次膦酸酯。对于混合芳基膦,最富电子的芳基迁移形成次膦酸盐,而对于二烷基联芳基膦,发生烷基迁移。二烷基二芳基膦也产生芳烃环氧化物,特别是在富电子系统中。高温下次膦酸酯的形成会增加,而质子溶剂会增加环氧化物的产率。产物分布为 Buchwald 最近关于二烷基二芳基膦有氧氧化的构象模型提供了证据。