| 摘要 |
Quinazoline derivs. [I; R1,R2 = H, halogen, lower alkyl, hydroxy, lower alkoxy, hydroxy-(lower alkyl), (lower alkoxy)-(lower alkyl), Ph, Phenoxy, amino, lower alkylamino, di(lower alkyl)amino; R3 = H, lower alkyl, Ph; R4 = lower alkyl, hydroxy-(lower alkyl), (lower alkoxy)-(lower alkyl), aryl-(lower alkyl), aryl , useful as blood platelet aggregation inhibitor were prepd. by the reaction of II and cyanogen bromide, or III(R5 = lower alkyl) and ammonia.
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