(4-Acylpyrrol-2-yl)alkanoic acid derivatives were prepared and evaluated for their ability to inhibit the cytosolic phospholipase A(2) of intact bovine platelets. To define the structural requirements for enzyme inhibition, the alkanoic acid group, the acyl residue and the position of the pyrrole nitrogen relative to the pyrrole substituents were varied systematically. Inhibition of cPLA(2) was best by compounds containing a free acetic acid or propionic acid group and an acyl chain of 12 or more carbons. The position of the pyrrole nitrogen did not influence the activity significantly. One of the most potent of the cPLA(2) inhibitors synthesized was (1,3,5-trimethyl-4-octadecanoylpyrrol-2-yl)acetic acid (IC50: 10 mu M).
(4-酰基
吡咯-2-基)烷基酸衍
生物被制备并评估了它们对完整牛血小板胞质
磷脂酶A2(cP
LA2)的抑制能力。为了明确酶抑制的结构要求,系统性地改变了烷基酸基团、酰基基团以及
吡咯氮原子相对于
吡咯取代基的位置。结果显示,含有游离
乙酸或
丙酸基团且酰基链长度为12个或更多碳原子的化合物对cP
LA2的抑制效果最佳。
吡咯氮原子的位置对活性的影响不显著。其中,合成的cP
LA2
抑制剂中最 potent 的之一是(1,3,5-三甲基-4-十八酰基
吡咯-2-基)
乙酸(IC50:10微摩尔浓度)。