The present invention provides 8-substituted O.sup.6 -benzylguanine derivatives which have been found to be effective AGT inactivators, as well as pharmaceutical compositions comprising such derivatives along with a pharmaceutically acceptable carrier. Thus, for example, the present invention provides a compound of the formula ##STR1## wherein R.sub.1 is a substituent selected from the group consisting of amino, hydroxy, C.sub.1 -C.sub.4 alkylamino, C.sub.1 -C.sub.4 dialkylamino, and C.sub.1 -C.sub.4 acylamino, R.sub.2 is a substituent selected from the group consisting of C.sub.1 -C.sub.4 aminoalkyl, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 dialkylamino alkyl, and C.sub.1 -C.sub.4 pivaloylalkyl, and R.sub.3 is a C.sub.1 -C.sub.4 alkyl. The present invention further provides a method of enhancing the chemotherapeutic treatment of tumor cells in a mammal with an antineoplastic alkylating agent which causes cytotoxic lessons at the O.sup.6 -position of guanine by administering to a mammal an effective amount of one of the aforesaid derivatives and administering to the mammal an effective amount of an antineoplastic alkylating agent which causes cytotoxic lesions at the O.sup.6 -position of guanine.
本发明提供8-取代O.sup.6-苄基
鸟嘌呤衍
生物,发现其作为AGT失活剂具有有效性,以及包含这些衍
生物和药学上可接受的载体的制药组合物。例如,本发明提供式为##STR1##其中R.sub.1是从
氨基,羟基,C.sub.1-C.sub.4烷基
氨基,C.sub.1-C.sub.4二烷基
氨基和C.sub.1-C.sub.4酰基
氨基中选择的取代基,R.sub.2是从C.sub.1-C.sub.4
氨基烷基,C.sub.1-C.sub.4烷基,C.sub.1-C.sub.4二烷基
氨基烷基和C.sub.1-C.sub.4戊二酰基烷基中选择的取代基,R.sub.3是C.sub.1-C.sub.4烷基。本发明还提供一种方法,通过向哺乳动物施用上述衍
生物的有效量,并向哺乳动物施用在
鸟嘌呤的O.sup.6-位置引起细胞毒性损伤的抗肿瘤烷基化剂的有效量,以增强肿瘤细胞的化疗治疗。