Synthesis of geminal bisphosphonates via organocatalyzed enantioselective Michael additions of cyclic ketones and 4-piperidones
作者:Ana Maria Faísca Phillips、Maria Teresa Barros
DOI:10.1039/c1ob06473h
日期:——
A Michaeladdition reaction of cyclic ketones and piperidones to a vinyl phosphonate is described. The reaction, catalyzed by chiral diamines, produced geminal γ-oxobisphosphonates in high yields (up to 92%) and very high ees (up to >99%). Disubstituted ketones gave drs of up to 8 : 92. The synthesis and characterization of several new compounds with potential biological activity is described.