Synthesis of both syn and anti diastereoisomers of Boc-dolaproine from (S)-proline through DKR using ruthenium-catalyzed hydrogenation: a dramatic role of N-protecting groups
作者:Céline Mordant、Sébastien Reymond、Virginie Ratovelomanana-Vidal、Jean-Pierre Genêt
DOI:10.1016/j.tet.2004.07.043
日期:2004.10
The natural (2R,3R)-Boc-dolaproine and its unnatural (2S,3S) diastereoisomer were synthesized involving as key transformation the Ru(II)-promoted hydrogenation of the beta-keto-alpha-methyl ester derived from (S)-N-Boc-proline. Interestingly, the asymmetric hydrogenation of this beta-keto ester N-protected as an amine hydrochloride salt, provided the corresponding anti (2S,3R)- and (2R,3S)-beta-hydroxy-alpha-methyl esters with significant level of selectivities through dynamic kinetic resolution. (C) 2004 Elsevier Ltd. All rights reserved.