Design, Synthesis, and Biological Evaluation of Beauveriolide Analogues Bearing Photoreactive Amino Acids
作者:Yuichi Masuda、Kazumasa Aoyama、Masahito Yoshida、Keisuke Kobayashi、Taichi Ohshiro、Hiroshi Tomoda、Takayuki Doi
DOI:10.1248/cpb.c16-00095
日期:——
we designed beauveriolide analogues 1a-1d wherein the Leu or D-allo-Ile residue was replaced by photoreactive amino acids possessing methyldiazirine or trifluoromethyldiazirine in the side chains. The methyldiazirine moiety was installed by reaction of methyl ketones with liquid ammonia to provide imine intermediates, followed by treatment with hydroxylamine-O-sulfonic acid to provide the diaziridines
据报道,天然存在的环二肽中的白僵菌内酯I和III与固醇O-酰基转移酶(SOAT)结合,抑制了其合成胆固醇酯的能力。为便于分析这些化合物的结合位点,我们设计了甜菜素内酯类似物1a-1d,其中Leu或D-allo-Ile残基被侧链上具有甲基二氮杂或三氟甲基二氮杂的光敏氨基酸取代。通过使甲基酮与液氨反应以提供亚胺中间体来安装甲基二嗪基部分,然后用羟胺-O-磺酸处理以提供二氮丙啶。随后的氧化得到甲基二嗪。相反,三氟甲基二嗪衍生物是通过肟中间体由三氟甲基酮制备的,将其转化为重氮丙啶。随后的氧化得到三氟甲基重氮。将合成的光反应性氨基酸3a-3d与3-羟基-4-甲基辛酸4和二肽5偶联,然后进行大内酰胺化,以提供甜菜碱内酯类似物1a-1d。发现1a-1d的SOAT抑制活性与金紫红色内酯I和III一样有效。此外,1a-1d选择性抑制SOAT1而不是SOAT2,这也与金紫苏内酯I和III的行为一致。发现1a-