Scalable Synthesis and Isolation of the Four Stereoisomers of Methyl 1-Amino-3-(4-bromophenyl)cyclopentanecarboxylate, Useful Intermediates for the Synthesis of S1P1 Receptor Agonists
作者:Grier A. Wallace、Thomas D. Gordon、Martin E. Hayes、Donald B. Konopacki、Shannon R. Fix-Stenzel、Xiaolei Zhang、Pintipa Grongsaard、Kevin P. Cusack、Lisa M. Schaffter、Rodger F. Henry、Robert H. Stoffel
DOI:10.1021/jo900376b
日期:2009.7.3
The individual isomers of methyl 1-amino-3-(4-bromophenyl)cyclopentanecarboxylate are useful intermediates for the synthesis of SIPI receptor agonists. Herein we describe a scalable synthesis and isolation of each of the four stereoisomers of this compound in gram quantities with >98% ee and de. The utility of this approach is demonstrated by the synthesis of ((1R,3R)-1-amino-3-(4-octylphenyl)cyclopentyl)methanol in 7 steps, 11% overall yield, and >98% ee and de.