83442-59-5Relevant articles and documents
New pyrazoles by 1,3-dipolar cycloaddition reactions between sydnones and activated alkynes
Dumitra?cu, Florea,Drǎghici, Constantin,Vuluga, Daniela,Cǎproiu, Miron Teodor
, p. 255 - 260 (2007/10/03)
The 3-(2,4-dimethylphenyl)sydnone(8a) was halogenated at the 4-position giving 4-halogenosydnones 8b-d. The 1,3-dipolar cycloaddition reactions of sydnones 8 with symmetrical and non-symmetrical acetylenic esters afforded pyrazoles 9a-g, 10a,b and 11, res