Synthesis 2004(12): 2040-2046  
DOI: 10.1055/s-2004-829142
PAPER
© Georg Thieme Verlag Stuttgart · New York

Diastereo- and Enantioselective Synthesis of Differently N,O-Protected 1,3-Amino Alcohols with Three Neighbouring Stereogenic Centers

Dieter Enders*, Michael Moser, Gunter Geibel, Monika C. Laufer
Institut für Organische Chemie, Rheinisch-Westfälische Technische Hochschule, Professor-Pirlet-Straße 1, 52074 Aachen, Germany
Fax: +49(241)8092127; e-Mail: Enders@RWTH-aachen.de;
Further Information

Publication History

Received 27 April 2004
Publication Date:
13 July 2004 (online)

Abstract

An efficient diastereo- and enantioselective access to all-syn-configured, differently N,O-protected 1,3-amino alcohols via a titanium tetrachloride mediated aza-enolate aldol reaction/aldehyde hydrazone 1,2-addition protocol is described. The O-TBS and N-Cbz protected title compounds are obtained after reductive N-N bond cleavage in a four steps synthesis with moderate to good overall yields (18-58%), high diastereomeric (de = 78% to ÷96%) and enantiomeric (ee ÷96%) excesses.