Conformationally Constrained Analogues of Diacylglycerol. 12. Ultrapotent Protein Kinase C Ligands Based on a Chiral 4,4-Disubstituted Heptono-1,4-lactone Template
作者:Jeewoo Lee、Rajiv Sharma、Shaomeng Wang、George W. A. Milne、Nancy E. Lewin、Zoltan Szallasi、Peter M. Blumberg、Clifford George、Victor E. Marquez
DOI:10.1021/jm950278f
日期:1996.1.1
designed as a new set of PK-C ligands. This reversal of the ester function produced some new DAG mimetics that are embedded in a C-4 doubly-branched heptono-1,4-lactone template. The reversed ester analogues were impervious to racemization, and their chemically distinct branches facilitated the enantiospecific syntheses of all targets. Compound 2, the simplest reversed ester analogue of 1 (Chart 1), exhibited
先前显示在5(-)[((酰氧基)甲基] -5-(羟甲基)四氢-2-呋喃酮)模板(1,图1)上构建的二酰基甘油(DAG)的构象受限类似物(PK-C alpha)以立体定向方式播放。但是,这些化合物通过快速的酰基迁移而容易消旋,并失去了生物效价。为了解决这个问题,“反向酯”类似物被设计为一组新的PK-C配体。酯功能的这种逆转产生了一些新的DAG模拟物,这些模拟物被嵌入C-4双支化的1,4-内酯Heptono-1,4-lactone模板中。反向酯类似物不能消旋,其化学上独特的分支促进了所有靶标的对映体特异性合成。化合物2,最简单的1的反向酯类似物(图1),表现出对PK-Cα的结合亲和力降低了3.5倍,这归因于稳定纱布相互作用的丧失,该作用导致了2中的酯分支比正常酯1中更无序。但是,丙酰基分支的转化2变成丙烯酰基分支恢复了结合亲和力(3对5)。如所预期的,化合物以严格的对映选择性与酶结合(3和5与