Design, synthesis, biological evaluation and X-ray crystal structure of novel classical 6,5,6-tricyclic benzo[4,5]thieno[2,3-d]pyrimidines as dual thymidylate synthase and dihydrofolate reductase inhibitors
作者:Xin Zhang、Xilin Zhou、Roy L. Kisliuk、Jennifer Piraino、Vivian Cody、Aleem Gangjee
DOI:10.1016/j.bmc.2011.03.067
日期:2011.6
Classical antifolates (4–7) with a tricyclic benzo[4,5]thieno[2,3-d]pyrimidine scaffold and a flexible and rigid benzoylglutamate were synthesized as dual thymidylate synthase (TS) and dihydrofolate reductase (DHFR) inhibitors. Oxidative aromatization of ethyl 2-amino-4-methyl-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxylate (±)-9 to ethyl 2-amino-4-methyl-1-benzothiophene-3-carboxylate 10 with 10% Pd/C
经典的抗叶酸剂(4 - 7)与三环类苯并[4,5]噻吩并[2,3- d ]嘧啶骨架和一个柔性和刚性benzoylglutamate合成为双胸苷酸合酶(TS)和二氢叶酸还原酶(DHFR)抑制剂。2-氨基-4-甲基-4,5,6,7-四氢-1-苯并噻吩-3-羧酸乙酯 (±)- 9氧化芳构化为2-氨基-4-甲基-1-苯并噻吩-3-含 10% Pd/C 的羧酸盐10是关键的合成步骤。具有 2-CH 3取代基的化合物抑制人 (h) TS (IC 50 = 0.26–0.8 μM),但不抑制 hDHFR。用 2-NH 2取代 2-CH 3将 hTS 抑制提高 10 倍以上,并且还提供出色的 hDHFR 抑制(IC 50 = 0.09–0.1 μM)。该研究表明,三环苯并[4,5]噻吩并[2,3- d ]嘧啶支架非常有利于单hTS或双hTS-hDHFR抑制,具体取决于2位取代基。的X射线晶体结构6和7