Synthesis 2015; 47(04): 472-480
DOI: 10.1055/s-0034-1379398
paper
© Georg Thieme Verlag Stuttgart · New York

Organocatalytic Asymmetric Synthesis of Dihydroisoquinolinones via a One-Pot Aza-Henry–Hemiaminalization–Oxidation Sequence

Robert Hahn
Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany   Fax: +49(241)8092127   Email: enders@rwth-aachen.de
,
Ehsan Jafari
Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany   Fax: +49(241)8092127   Email: enders@rwth-aachen.de
,
Gerhard Raabe
Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany   Fax: +49(241)8092127   Email: enders@rwth-aachen.de
,
Dieter Enders*
Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany   Fax: +49(241)8092127   Email: enders@rwth-aachen.de
› Author Affiliations
Further Information

Publication History

Received: 13 October 2014

Accepted: 14 October 2014

Publication Date:
14 November 2014 (online)


Abstract

The asymmetric organocatalytic one-pot synthesis of trans-3,4-disubstituted 3,4-dihydroisoquinolin-1(2H)-ones is described. Starting from 2-(nitromethyl)benzaldehydes and various N-protected aldimines, 5 mol% of a quinine-based squaramide organocatalyst was used to synthesize the title compounds as virtually single diastereomers via an aza-Henry–hemiaminalization–oxidation sequence. Moderate to good yields (39–78%) and moderate to very good enantioselectivities (40–95% ee) were reached.

Supporting Information