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.
Practical synthesis of both enantiomers of protected 4-oxopipecolic acid
作者:Fabrizio Machetti、Franca M Cordero、Francesco De Sarlo、Alberto Brandi
DOI:10.1016/s0040-4020(01)00429-x
日期:2001.6
A new synthesis of bothenantiomers of protected 4-oxopipecolic acid was achieved in six steps via 1,3-dipolar cycloaddition of C-ethoxycarbonyl N-(1R)-phenylethylnitrone to but-3-en-1-ol.