Synthesis 2006(23): 4060-4064  
DOI: 10.1055/s-2006-950346
SPECIALTOPIC
© Georg Thieme Verlag Stuttgart · New York

Organocatalytic Asymmetric α-Aminomethylation of Cyclohexanones

Ismail Ibrahem, Pawel Dziedzic, Armando Córdova*
Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 10691 Stockholm, Sweden
Fax: +46(8)154908; e-Mail: acordova@organ.su.se;
Further Information

Publication History

Received 28 August 2006
Publication Date:
06 November 2006 (online)

Abstract

The amino acid catalyzed direct asymmetric Mannich reaction between aminomethyl ether 1 and cyclohexanones is presented. The unprecedented reaction proceeds via an ionic transition state and gives the corresponding Mannich bases in moderate to high yields with 75-99% ee.

18

Ibrahem, I.; Zhao, G. -L.; Córdova, A. Chem. Eur. J. 2006, in press (DOI: 10.1002/chem.200600725).

21

Neutral aluminum oxide was used, since the Mannich bases 3 racemize during silica gel column chromatography.