Enantioselective Synthesis of Conformationally Restricted Analogs of NMDA: cis- and trans-Piperidine-2,3-dicarboxylic Acids and Methylated Derivatives
摘要:
Various enantiopure stereoisomeric cyclic amino diacids belonging to the 2,3-piperidinedicarboxylic acid series mere obtained via an aza-annulation reaction between enamino esters and acryloyl, methacryloyl, or crotonyl chloride. Enantioselective syntheses of these conformationnally restricted analogs of N-methyl-D-aspartic acid were realized owing to a chiral induction originated from (2S)-2-phenylglycinol. New information about the mechanism of the aza-annulation process is inferred from AM1 calculations which were performed in order to explain the steroselectivity displayed during the formation of the C-4 stereocenter In compound 4.
Neuromediator analogs: Synthesis of cis (2R,3S) and trans (2S,3S)-2,3-piperidine dicarboxylic acids from (2S)-2-phenylglycinol
作者:Claude Agami、Catherine Kadouri-Puchot、Valérie Le Guen、Jacqueline Vaissermann
DOI:10.1016/0040-4039(95)00088-t
日期:1995.3
The cis and trans isomers of 2,3-piperidine dicarboxylic acids were obtained in enantiopure forms from the same chiral inductor: 2-phenylglycinol. This synthesis was mainly based on a δ-lactam formation via Stille's aza-annulation/hydrogenation procedure which includes here an asymmetric induction.
Enantioselective Synthesis of Conformationally Restricted Analogs of NMDA: <i>cis</i>- and <i>trans</i>-Piperidine-2,3-dicarboxylic Acids and Methylated Derivatives
作者:Claude Agami、Louis Hamon、Catherine Kadouri-Puchot、Valérie Le Guen
DOI:10.1021/jo9606158
日期:1996.1.1
Various enantiopure stereoisomeric cyclic amino diacids belonging to the 2,3-piperidinedicarboxylic acid series mere obtained via an aza-annulation reaction between enamino esters and acryloyl, methacryloyl, or crotonyl chloride. Enantioselective syntheses of these conformationnally restricted analogs of N-methyl-D-aspartic acid were realized owing to a chiral induction originated from (2S)-2-phenylglycinol. New information about the mechanism of the aza-annulation process is inferred from AM1 calculations which were performed in order to explain the steroselectivity displayed during the formation of the C-4 stereocenter In compound 4.