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Paper | Regular issue | Vol 41, No. 4, 1995, pp.721-740
Published online, 1st January, 1970
DOI: 10.3987/COM-94-6976
Synthesis and Reactions of Dialkyl (1-R-5-Amino-3-methylsulfanyl-1H-pyrazol-4-yl)-phosphonates

Harald G. Krug, Richard Neidlein, Roland Boese, and Walter Kramer

*Pharmazeutisch-Chemisches Institut, Im Neuenheimer Feld 364, 69120 Heidelberg, Germany


Dialkyl (1-cyano-2,2-bismethylsulfanylvinyl)phosphonates (2) react with hydrazines (4) to yield pyrazoles (5). The composition of one reaction product is examined by X-ray crystal structure analysis. N-Unsubstituted pyrazoles (5a) treated with 1,3-diketones (6) give pyrazolo[1,5-a]pyrimidines (7).