A new synthesis of (2S)-4-oxopipecolic acid by thermal rearrangement of enantiopure spirocyclopropaneisoxazolidine
作者:Fabrizio Machetti、Franca M. Cordero、Francesco De Sarlo、Antonio Guarna、Alberto Brandi
DOI:10.1016/0040-4039(96)00796-4
日期:1996.6
(2S)-4-oxo-pipecolic acid is reported. The synthetic route employs as a key step the diastereoselective cycloaddition of the N-glycosylnitrone 7 to methylenecyclopropane followed by thermalrearrangement of the spirocyclopropaneisoxazolidine 8a. Stereoselective reduction of the N-BOC methyl ester of 4-oxopipecolic acid by L-selectride® gives the protected cis-4-hydroxy-pipecolic acid 14.