Synlett 2007(3): 0460-0464  
DOI: 10.1055/s-2007-968029
LETTER
© Georg Thieme Verlag Stuttgart · New York

Asymmetric Synthesis of Conformationally Constrained trans-2,3-Piperidinedicarboxylic Acid Derivatives

Jincong Zhuo*, David M. Burns, Colin Zhang, Meizhong Xu, Lingkai Weng, Ding-Quan Qian, Chunhong He, Qiyan Lin, Yun-Long Li, Eric Shi, Costas Agrios, Brian Metcalf, Wenqing Yao*
Incyte Corporation, Medicinal Chemistry Division, Experimental Station, Wilmington, DE 19880, USA
Fax: +1(302)4252704; e-Mail: JZhuo@incyte.com; e-Mail: WYao@incyte.com;
Further Information

Publication History

Received 8 August 2006
Publication Date:
07 February 2007 (online)

Abstract

An efficient asymmetric synthesis of conformationally constrained (2S,3S)-piperidinedicarboxylic acid derivatives starting from l-aspartic acid β-tert-butyl ester and 3-chloro-2-(chloromethyl)-1-propene is described. The key steps involve N-alkylation of the aspartic acid ester followed by a stereoselective enolate intra­molecular cyclization (>95:5 dr). Various synthetic strategies were explored to achieve the cyclopropanation of the resulting olefin, ­including the Simmons-Smith reaction and palladium-catalyzed cyclopropanation.