The antiapoptotic protein Bcl-2, overexpressed in many tumor cells, is an attractive target for potential small molecule anticancer drug discovery. Herein, we report a different structural modification approach on ABT-263 by merging the piperazinyl-phenyl fragment into a bicyclic framework leading to a series of novel analogues, among which tetrahydroisoquinoline 13 was nearly equally potent against Bcl-2 as ABT-263. Further SAR in the P4-interaction pocket affored the difluoroazetidine substituted analogue 55, which retained good Bcl-2 activity with improved Bcl-2/Bcl-xL selectivity.

中文翻译：

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新型酰基磺酰胺类有效和选择性Bcl-2抑制剂的设计，合成和药理学评估

在许多肿瘤细胞中过表达的抗凋亡蛋白Bcl-2是潜在的小分子抗癌药物发现的有吸引力的靶标。在这里，我们报告了通过将哌嗪基-苯基片段合并到一个双环框架中而导致一系列新型类似物的对ABT-263的不同结构修饰方法，其中四氢异喹啉13对Bcl-2的作用几乎与ABT-263相同。P4相互作用口袋中的进一步SAR修饰了二氟氮杂环丁烷取代的类似物55，该类似物保留了良好的Bcl-2活性，并具有改善的Bcl-2 / Bcl-xL选择性。