Alkyl 5,6-dichloro-3,4-dihydro-2(1H)-iminoquinazoline-3-acetate hydrohalides

Abstract

The known blood platelet antiaggregative agent 6,7-dichloro-1,5-dihydroimidazo[2,1-b]quinazolin-2(3H)-one is prepared in high yield via an improved process involving a novel intermediate of the Formula ##STR1## in which R.sup.1 is (lower)alkyl and X is bromo, chloro or iodo. Two processes for the preparation of compounds of the Formula III are disclosed, one of which involves the novel intermediate ##STR2##

Dependencies are inferred from the claim text.