Synthesis 2002(18): 2756-2760
DOI: 10.1055/s-2002-35987
PAPER
© Georg Thieme Verlag Stuttgart · New York

Studies on Isocyanides and Related Compounds; Synthesis of 1,4-Benzodiazepine-2,5-diones via Ugi Four-Component Condensation

Cristina Faggia, Stefano Marcaccini*b, Roberto Pepinob, M. Cruz Pozob
a CRIST, Centro Interdipartimentale di Cristallografia, Università di Firenze, via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy
b Dipartimento di Chimica Organica ‘Ugo Schiff’, Università di Firenze, via della Lastruccia 13, 50019 Sesto Fiorentino (FI), Italy
Further Information

Publication History

Received 9 January 2002
Publication Date:
06 December 2002 (online)

Abstract

A convenient two-step synthesis of the title compounds based on the isocyanide chemistry is reported. The Ugi four-component condensation between 4-chloro-2-nitrobenzoic acid (1), aldehydes 2, cyclohexyl isocyanide (3) and α-amino esters as the amino components afforded the expected nitro compounds 5 which were reductively cyclized to the desired 1,4-benzodiazepine-2,5-diones 7 via the intermediate amino derivatives 6.

16

Bruker Molecular Analysis Research Tool V 5.625, 1997-2000, Bruker AXS.

18

Sheldrick, G. M.; SHELXL97: Program for Crystal Structure Refinement, Institut für Anorganische Chemie der Universität Göttingen, Göttingen, Germany.