Synthesis of enantiomerically pure all cis-2,3,6-trisubstituted piperidine: a silicon mediated total synthesis of (+)-carpamic acid
作者:Rekha Singh、Sunil K Ghosh
DOI:10.1016/s0040-4039(02)01853-1
日期:2002.10
A stereoselective total synthesis of (+)-carpamic acid 1 has been achieved from the σ-symmetric 3-[dimethyl(phenyl)silyl]glutaric anhydride 11 featuring its asymmetric desymmetrisation using oxazolidinone 12. The dimethyl(phenyl)silyl group is not only acting as a masked hydroxy group but also stereodirects ester enolate methylation and facilitates the Curtius reaction of the β-silyl-amide 23. A highly
立体选择性的(+)-氨基甲酸1的全合成反应是由σ对称的3- [二甲基(苯基)甲硅烷基]戊二酸酐11使用恶唑烷酮12进行的不对称脱对称。二甲基(苯基)甲硅烷基不仅起掩蔽的羟基的作用,而且还立体定向酯烯醇化甲基,并促进β-甲硅烷基酰胺23的库尔修斯反应。亚胺10的高度立体选择性氢化是构建所有顺式-2,3,6-三取代哌啶的关键步骤。