V. Mamedov, I. Z. Nurkhametova, A. Gubaidullin
Feb 1, 2005
Citations
0
Influential Citations
2
Citations
Journal
Russian Chemical Bulletin
Abstract
Condensation of methyl phenylchloropyruvate with 4-phenylthiosemicarbazide proceeds as the Bose reaction to form 5-methoxycarbonyl-6-phenyl-2-phenylimino-6H-1,3,4-thiadiazine, which is hydrolyzed to give carboxylic acid. In the presence of polyphosphoric acid, the latter undergoes intermolecular cyclodehydration accompanied by sulfur extrusion to yield dipyrazolo [1,5-a,1′,5′d]pyrazine.