Whereas each of α-thiocarbamoyl-and α-cyanomalononitrile derivatives 1a and 1d reacted with benzamidine (2) hydrochloride to give only 4-amino-6-(4-chlorophenyl)-2-phenyl-5- pyrimidine-carbonitrile (5a), they react with 5-amino-3-phenylpyrazole (6) to yield the two ...
