Enol lactone inhibitors of serine proteases. The effect of regiochemistry on the inactivation behavior of phenyl-substituted (halomethylene)tetra- and dihydrofuranones and tetrahydropyranones toward .alpha.-chymotrypsin: stable acyl enzyme intermediate
作者:Michael J. Sofia、John A. Katzenellenbogen
DOI:10.1021/jm00152a011
日期:1986.2
We have found that alpha-aryl-substituted halo enol lactones (I and II) are effective mechanism-based inactivators for chymotrypsin. In this study, we have investigated, for comparative purposes, halo enol lactones with aryl functions situated beta and gamma to the lactone carbonyl group. We synthesized 4-phenyl-5(E)-(iodomethylidene)tetrahydro-2-furanone (1), 4-phenyl-5(E)-(iodomethylidene)dihydro-2-furanone
我们已经发现,α-芳基取代的卤代烯醇内酯(I和II)是胰凝乳蛋白酶的有效的基于机理的灭活剂。在本研究中,为了进行比较,我们研究了具有内酯官能团的内酯羰基的β和γ的卤代烯醇内酯。我们合成了4-苯基-5(E)-(碘代亚甲基)四氢-2-呋喃酮(1),4-苯基-5(E)-(碘代亚甲基)二氢-2-呋喃酮(2),4-苯基-6( E)-(碘亚甲基)四氢-2-吡喃酮(3)和5-苯基-6(E)-(碘亚甲基)四氢-2-吡喃酮(4),通过卤代内酯化反应转化为适当的苯基取代的炔酸前体进入相应的5(E)-(卤代亚甲基)呋喃酮和6(E)-(卤代亚甲基)吡喃酮体系。4-苯基呋喃酮(1和2)和5-苯基吡喃酮(4)被证明是唯一可逆的竞争性抑制剂。相反,4-苯基四氢吡喃酮(3)以时间依赖性方式灭活了α-胰凝乳蛋白酶。这种失活非常迅速但可逆,酶活性的再生是自发的并且肼加速的,这表明存在稳定的酰基酶。碘亚甲基内酯3与相应的蛋白质