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Note | Regular issue | Vol 71, No. 3, 2007, pp.657-668
Published online, 19th January, 2007
DOI: 10.3987/COM-06-10921
Synthesis of 2-Unsubstituted 2,3,5,6,7,8-Hexahydropyrazolo[4,3-d][1,2]diazepinone-8-carboxylates

David Bevk, Jurij Svete,* and Branko Stanovnik*

*Department of Organic Chemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana, Askerceva 5, P.O. Box 537, 1000 Ljubljana, Slovenia

Abstract

Substituted 2,3,5,6,7,8-hexahydropyrazolo[4,3-d][1,2]diazepine-8-carboxy-lates were prepared in good to excellent yields from ethyl (2E)-3-(dimethylamino)-2-{(4Z)-4-[(dimethylamino)-methylidene]-4,5-dihydro-5-oxo-1H-pyrazol-3-yl}propenoate with 1,2-disubstituted hydrazines by heating in an alcohol.