Synthesis 2005(12): 2039-2045  
DOI: 10.1055/s-2005-869908
PAPER
© Georg Thieme Verlag Stuttgart · New York

A Novel One-Pot, Three-Component Access to Hexahydropyrrolo[2,1-a]isoquinolines by an Alkylation-Dehydrohalogenation-1,3-Dipolar Cycloaddition Sequence

Miklós Nyerges*a, Barbara Somfaia, Judit Tótha, László Tőkea, András Dancsób, Gábor Blaskób
a Organic Chemical Technology Research Group of the Hungarian Academy of Sciences, Budapest University of Technology and Economics, 1521 Budapest P.O. Box 91, Hungary
Fax: +361(463)3648; e-Mail: mnyerges@mail.bme.hu;
b EGIS Pharmaceuticals Ltd., 1475 Budapest P.O. Box 100, Hungary
Further Information

Publication History

Received 6 January 2005
Publication Date:
19 May 2005 (online)

Abstract

A simple one-pot process for the alkylation of isoquinolines followed by a dehydrohalogenation of the quaternary salts formed and by an in situ trapping of azomethine ylides with appropriate dipolarophiles is described. This method has successfully been applied to the synthesis of benz[5,6]azepino[2,1-a]isoquinolines and 5,6-dihydroindazolo[3,2-a]isoquinoline 8-oxides via an 1,7-electrocyclization process of similar type azomethine ylides.