Pyridine → HCID 86735887, compound

Participants

Reaction Steps

A solution of 5 g. (0.018 mole) of ethyl 7-amino-4-methyl-4,5-dihydro-5-oxopyrazolo[1,5-a]quinazoline-3-carboxylate and 2.4 g. (0.018 mole) of phenyl isothiocyanate in 250 ml. of pyridine was stirred and heated on a steam bath for about 2 hours, then cooled and diluted with water. The solid which separated was collected to give crude ethyl 4-methyl-7-phenylthioureido-4,5-dihydro-5-oxopyrazolo[1,5-a]quinazoline-3-carboxylate which was not further purified but used as such in Example 7T.

Provenance & Evidence