METHOD OF OBTAINING NOVEL DERIVATIVES OF 1,2,3,5-TETRAHYDROIMIDAZO(2,1-B)QUINAZOLINE

摘要

Compounds according to the formula IMAGE (I) and the pharmaceutically acceptable acid addition salts thereof wherein: n is an integer of 1 to 6; R1 is hydrogen or alkyl of 1 to 4 carbons; R2 is hydrogen or R1 and R2 are combined to form an oxo group; R3 is hydrogen, alkyl of 1 to 6 carbons, phenyl, benzyl or hydroxy lower alkyl; R4 is hydrogen, alkyl of 1 to 6 carbons, benzyl, or hydroxy lower alkyl; Y is hydrogen, alkyl of 1 to 4 carbon atoms, halo or lower alkoxy; A is an amide forming group wherein the nitrogen substituents are: hydrogen; alkyl of 1 to 6 carbon atoms; hydroxyalkyl of 1 to 6 carbon atoms and its aliphatic acylates of 1 to 6 carbon atoms or aryl acylates of 7 to 12 carbon atoms; cycloalkyl of 3 to 7 carbon atoms or cycloalkyl lower alkyl of 4 to 11 carbon atoms wherein the cycloalkyl ring is unsubstituted or substituted with a lower alkyl, lower alkoxy, OH, -OCOR5, halo, -NH2, -N(R5)2, -NHCOR5, -COOH, or -COO(R5) group wherein R5 is lower alkyl; phenyl or phenyl lower alkyl wherein phenyl is unsubstituted or substituted with 1 or more lower alkyl, halo or lower alkoxy groups or an NH2, -N(R5)2, -NHCOR5, -COOH, or -COOR5 group wherein R5 is lower alkyl; morpholinyl; piperidinyl; perhexylenyl; N-loweralkylpiperazinyl; tetrahydroquinolinyl; tetrahydroisoquinolinyl; (+/-)-decahydroquinolinyl or indolinyl. These compounds are cyclic AMP phosphodiesterase inhibitors useful as antithrombotic agents and the like in mammals.