Phosphonamide stabilized allylic carbanions. New homoenolate anion equivalents
作者:David A. Evans、James M. Takacs、Kenneth M. Hurst
DOI:10.1021/ja00496a016
日期:1979.1
The chemistry of phosphonamide stabilized allylic carbanions derived from the 1,2-addition of tervalent phosphorus siloxanes with a,b-unsaturated aldehydes has been studied. An in situ synthesis of allylic cu-silyloxyphosphonamides, followed by metalation and regioselective y-alkylation of the allylic carbanion, yields a versatile "active ester". Transesterification under mild conditions gives esters