Enantioselective Michael addition of 3-aryloxindoles to a vinyl bisphosphonate ester catalyzed by a cinchona alkaloid derived thiourea catalyst
作者:Mei-Xin Zhao、Tong-Lei Dai、Ran Liu、Deng-Ke Wei、Hao Zhou、Fei-Hu Ji、Min Shi
DOI:10.1039/c2ob25966d
日期:——
A highly enantioselective Michael addition of 3-aryloxindole to vinyl bisphosphonate ester catalyzed by a cinchonidine derived thiourea catalyst has been investigated. The corresponding adducts, containing a chiral quaternary carbon center and geminal bisphosphonate ester fragment at the 3-position of the oxindole, were obtained in moderate to good yields (65–92%) and moderate to good enantioselectivities