Abstract
2-Arylamino-2-(3-methyl-5-oxo-1-phenyl-1,5-dihydro-4H-pyrazol-4-ylidene)ethanenitriles (6a–c) together with the corresponding formanilides (7a–c) are formed in the reaction of N1,N2-diarylformamidines (1a–c) with 2-(1,5-dihydro-3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-ylidene)propanedinitrile (2). The analogous N1,N2-diarylacetamidines (8b–d) with 2 gave 5-oxospiro[(1,5-dihydro-4H-pyrazole)-4,4′-(1′,2′,3′,4′-tetrahydropyridine)]-5′-carbonitriles (17b–d) and in two cases 2-arylamino-(1,5-dihydro-3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-ylidene) ethanenitriles (6b,c) together with the acetanilides (12b,c), which were obtained as minor products.
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