Design, Synthesis, and Biological Activity of <i>m</i>-Tyrosine-Based 16- and 17-Membered Macrocyclic Inhibitors of Hepatitis C Virus NS3 Serine Protease
作者:Kevin X. Chen、F. George Njoroge、John Pichardo、Andrew Prongay、Nancy Butkiewicz、Nanhua Yao、Vincent Madison、Viyyoor Girijavallabhan
DOI:10.1021/jm050323b
日期:2005.10.1
weak HCV inhibitors with a binding constant, Ki, above 5 microM. We envisioned that cyclization of a P2 phenyl side chain to a P3 capping group could enhance binding through an interaction of the resulting macrocycle with the methyl group of Ala156 on the enzyme backbone. The macrocyclic dipeptide moiety would also decrease the peptidic nature of the inhibitors. The synthesis of macrocyclic HCV inhibitors
当前用于治疗丙型肝炎病毒(HCV)感染的疗法的有限的功效和相当大的副作用促使人们为开发安全有效的新疗法做出了巨大的努力。1型五肽α-酮酰胺是弱HCV抑制剂,其结合常数Ki大于5 microM。我们预想到,P2苯基侧链与P3封端基的环化可以通过所得大环与酶骨架上Ala156的甲基相互作用而增强结合。大环二肽部分也将降低抑制剂的肽性质。大环HCV抑制剂的合成从间酪氨酸甲酯开始。两次连续的偶联,首先是与Boc-环己基甘氨酸偶联,然后是与hept-6-烯酸偶联,得到化合物6。烯烃通过硼氢化反应转化为醇。酚醇7的关键大环化是通过Mitsunobu反应实现的。准备了16元和17元大环(8和21)。水解后,将大环酸(15和22)与右手三肽(14)偶联,得到α-羟酰胺,在Dess-Martin的高碘烷氧化后,它提供了所需的α-酮酰胺。在这些肽的C-末端掺入了酯,酸和酰胺。这些抑制剂在HCV蛋白酶连续测定中