Stereoarrays with an All-Carbon Quaternary Center: Diastereoselective Desymmetrization of Prochiral Malonaldehydes
作者:Bruno Linclau、Elena Cini、Catherine S. Oakes、Solen Josse、Mark Light、Victoria Ironmonger
DOI:10.1002/anie.201107370
日期:2012.1.27
The MgBr2 chelation of prochiral malonaldehydes allows diastereoselective monoaddition reactions with allyl stannane nucleophiles (see scheme; PG=protecting group, TBDMS=tert‐butyldiphenylmethylsilyl, Tr=trityl). In the same pot, addition of a second nucleophile proceeds in high diastereoselectivity to generate nonsymmetric products with up to five contiguous stereogenic centers, including a chiral all‐carbon
通过螯合驯化:前手性丙二醛的MgBr 2螯合使烯丙基锡烷亲核试剂具有非对映选择性单加成反应(参见方案; PG =保护基,TBDMS =叔丁基二苯基甲基甲硅烷基,Tr =三苯甲基)。在同一个锅中,第二个亲核试剂的添加会以非对映异构体的高选择性进行,以生成具有多达五个连续立体中心(包括手性全碳四元中心)的非对称产物。