Synthesis 2001(5): 0735-0740
DOI: 10.1055/s-2001-12765
PAPER
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Furocoumarins via Rhodium(II)-Catalysed Heterocyclisation of 3-Diazobenzopyran-2,4(3H)-dione with Terminal Alkynes

Stefano Tollari*d, Giovanni Palmisano*d, Sergio Ceninia, Giancarlo Cravottob, Giovanni B. Giovenzanac, Andrea Penonia
a Dip. di Chimica Inorganica Metallorganica e Analitica and CNR Center, Via Venezian 21, 20133 Milano, Italy
b Dip. di Scienza e Tecnologia del Farmaco, Via Giuria 9,10125 Torino, Italy
c Dip. di Scienze Chimiche Alimentari Farmaceutiche e Farmacologiche, Viale Ferrucci 33, 28100 Novara, Italy
d Dip. di Scienze Chimiche, Fisiche e Matematiche, Via Valleggio 11, 22100 Como, Italy
Fax: +39(2)2362748; e-Mail: stefano.tollari@uninsubria.it; e-Mail: giovanni.palmisano@uninsubria.it;
Further Information

Publication History

Received 5 October 2000
Publication Date:
28 September 2004 (online)

Abstract

The rhodium (II) acetate-catalysed decomposition of 3-diazobenzopyran-2,4(3H)-dione in the presence of a terminal alkyne gave rise to a mixture of isomeric 2-substituted furo[3,2-c]coumarin and furo[2,3-b]coumarin, resulting from a formal [3+2] cycloaddition.

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Cenini S., Cravotto G., Giovenzana G. B., Palmisano G., Penoni A., Tollari S., unpublished results.

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We are investigating the synthetic potential of this reaction (e. g., insertion into aromatic systems) and will report our findings in due course (Cenini S., Giovenzana G.B., Goldoni L., Palmisano G., Penoni A., Tollari, S., unpublished results).