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Paper | Regular issue | Vol 41, No. 6, 1995, pp.1235-1250
Published online, 1st January, 1970
DOI: 10.3987/COM-95-7042
Reactions of 1,3-Dithietane-2,4-diylidenebis(cyanoacetic Acid Alkyl Esters) and 2-Cyano-3,3-bis(methylsulfanyl)acrylic Acid Ethyl Ester

Monika Jochheim, Harald G. Krug, Richard Neidlein,* and Claus Krieger

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


1,3-Dithietanes (1) react with carboxylic acid hydrazides (2) yielding substituted 1,3,4-oxadiazoles (3). The treatment of compound (1) with 5-phenylpyrazolidin-3-one (4) resulted in 5H-pyrazolo[5,1-b][1,3]thiazines (5). Pyrazoles (7) can be obtained by the reaction of ketene-S,S-acetals (6) with carboxylic acid hydrazides.