作者:Laurence Miesch、Tania Welsch、Michel Miesch
DOI:10.1039/c3ob40431e
日期:——
reaction between [(S)-(−)] or [(R)-(+)]-benzyloxypropanal and silyl enol ethers derived from bicyclo[3.2.0]alkanones was carried out in the presence of TiCl4, leading with total stereoselectivity to a 1 : 1 mixture of enantiomerically pure diastereomers isolated in 81% overall yield. Thus, 5 stereogenic centers could be created starting from one. Furthermore, an efficient access to an enantiomerically
之间[(A交叉醛醇缩合反应小号- ( - ))]或[([R )- (+)〕 - benzyloxypropanal和甲硅烷基烯醇醚从双环衍生〔3.2.0〕烷酮在的TiCl的存在下进行4,导致对81对映体纯的非对映异构体的混合物具有总的立体选择性,总收率为81%。因此,可以从一个开始创建5个立体生成中心。此外,通过4步反应序列,可以有效地获得对映体纯的三环[5.3.0.0 2,6 ]癸烷骨架。