Abstract
2-Cyano-2-carboximidic acid alkyl ester-oxiranes react with hydrazides and carbazates to give epoxy acylamidrazones. Some of the last ones are precursors of tetrasubstituted push-pull alkenes, which in turn can be efficiently converted into 3,5-diaminopyrazoles. Using ortho -phenylenediamine as nucleophile directly affords 3,4-dihydro-2, 2’-biquinoxalines.
Key words
oxiranes - epoxyacylamidrazones - diaminopyrazoles - biquinoxalines
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11 Crystallographic data (without structure factors) for the structure reported in this paper have been deposited at the Cambridge Crystallographic Data Center as supplementary publication no. CCDC - 135239. Copies of the data can be obtained free of charge on application to CCDC, 12 Union road, Cambridge CB2 1EZ, UK [Fax: (inter.) +44(1223)336033; E-mail: deposit@ccdc.cam.ac.uk].
