An Efficient Large-Scale Synthesis of a Naphthylacetic Acid CRTH2 Receptor Antagonist
作者:Lianhe Shu、Ping Wang、Chen Gu、Wen Liu、Lady Mae Alabanza、Yingchao Zhang
DOI:10.1021/op300306c
日期:2013.4.19
An efficient and practical synthesis of a naphthylacetic acid CRTH2 receptor antagonist is reported. Michael addition of ethyl t-butyl malonate to an allenoate afforded a triester, which was selectively hydrolyzed and decarboxylated to give a benzylidenepentanedioic acid monoester. Treatment of this compound with potassium acetate and acetic anhydride produced the naphthylacetate core. The triflate
报道了一种高效实用的萘乙酸CRTH2受体拮抗剂的合成方法。将叔丁基丙二酸乙酯的迈克尔加成到脲基甲酸酯中,得到三酯,将其选择性地水解和脱羧,得到亚苄基戊二酸单酯。用乙酸钾和乙酸酐处理该化合物产生了乙酸萘酯核。在改良的Negishi偶联条件下,将关键构件的三氟甲磺酸盐与侧链的锌试剂偶联,以提供目标产物。该工艺已成功扩大规模,以生产超过2千克的API。