Asymmetric synthesis of β-pyridyl-β-amino acid derivatives

Steven D. Bull, Stephen G. Davies*, David J. Fox, Massimo Gianotti, Peter M. Kelly, Camille Pierres, Edward D. Savory, Andrew D. Smith

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

The conjugate additions of homochiral lithium (R)-N-benzyl-N-α-methyl-4-methoxybenzylamide to tert-butyl 3-(3-pyridyl)- and tert-butyl 3-(4-pyridyl)-prop-2-enoates proceed in 84% de, and after subsequent recrystallisation and oxidative N-deprotection furnish the (S)-3-(3-pyridyl)- and (S)-3-(4-pyridyl)-β-amino acid derivatives in 97% ee and 98% ee respectively. Conjugate additions of lithium N-benzyl-N-α-methyl-4-methoxybenzylamide to tert-butyl 3-(2-pyridyl)prop-2-enoates proceed with low levels of diastereoselectivity unless the 3-(2-pyridyl) ring is substituted. Application of this methodology allows the asymmetric synthesis of (R)-tert-butyl 3-(2-chloro-3-methoxymethoxy-6-pyridyl)-3-aminopropanoate, the protected β-amino ester component of kedarcidin, in 97% ee.

Original languageEnglish
Pages (from-to)1858-1868
Number of pages11
JournalJournal of the Chemical Society. Perkin Transactions 1
Volume2
Issue number16
DOIs
Publication statusPublished - 14 May 2002

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