anti tumor mechanisms.

摘要

A quinazoline of the formula:- CHEM wherein R1 is alkyl, cycloalkyl, alkenyl, alkynyl, alkoxy, alkylthio, aryl, aryloxy, arylthio, arylalkyl, halogeno, hydroxy or mercapto, or substituted alkyl or alkoxy; wherein R2 is hydrogen, alkyl, alkenyl or alkynyl, or substituted alkyl or alkanoyl; wherein Ar is phenylene, naphthylene or heterocyclene which is unsubstituted or bears one or more substituents; wherein R3 is such that R3-NH2 is an amino acid; wherein R4 is hydrogen or alkyl; wherein R5 is hydrogen or alkyl; and wherein each of R6, R7 and R8 is hydrogen, hydroxy, alkyl, alkoxy, alkylthio, alkylamino, dialkylamino, phenyl, halogeno, nitro, cyano or amino, or substituted alkyl, alkoxy or alkylthio; provided that at least one of R4, R5, R6, R7 and R8 is other than hydrogen; or a pharmaceutically-acceptable salt or ester thereof. The compounds possess anti-tumour activity.