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Communication | Regular issue | Vol 24, No. 9, 1986, pp.2429-2436
Published online, 1st January, 1970
DOI: 10.3987/R-1986-09-2429
The Astounding Reaction of Diazomethane with Dimethyl 2,3-Dicyanofumarate

Rolf Huisgen,* Abhijit Mitra, and Joaquin Rodriguez Moran

*Institut für Organische Chemie, Universität München, Karlstrasse 23, D-80333 München, Germany


The title reaction afforded the pyrazole derivatives 3 and 4 as well as the N-methyl-1,2,3-triazolecarboxylic esters 5 - 7. The poly-step sequence was clarified; the key intermediates are the 1-pyrazoline 18, the 2-pyrazoline 2, the 4H-pyrazole 12, the pyrazole 22, and methyl cyanoformate.