Development of Manufacturing Processes for the Carboxylic Acid Key Intermediate of Lusutrombopag: One-Pot Reaction Process of Formylation and the Horner–Wadsworth–Emmons Reaction
作者:Takaharu Matsuura、Yusuke Sato、Yutaka Nishino、Tadafumi Komurasaki、Yoshiaki Imamura、Makoto Kakinuma
DOI:10.1021/acs.oprd.0c00311
日期:2020.11.20
5-dichloro-4-(3-ethoxy-2-methyl-3-oxoprop-1-en-1-yl)benzoic acid (3), which is a key carboxylic acid intermediate of lusutrombopag. This one-pot reaction process is composed of lithiation of 3,5-dichlorobenzoic acid with lithium diisopropylamide (LDA), formylation using N-formylmorpholine, followed by olefination employing the Horner–Wadsworth–Emmons reaction with triethyl 2-phosphonopropionate. This method enabled
我们描述了(E)-3,5-二氯-4-(3-乙氧基-2-甲基-3-氧代丙-1-烯-1-基)苯甲酸的一锅法制备工艺的发展(3) ,它是鲁舒莫巴的关键羧酸中间体。一锅法反应过程包括3,5-二氯苯甲酸与二异丙基氨基化锂(LDA)的锂化,使用N-甲酰基吗啉的甲酰化,然后使用Horner-Wadsworth-Emmons反应与2-膦酸丙酸三乙酯的烯化。该方法使公斤级规模的羧酸3(鲁舒通帕的关键中间体)具有高纯度,并减少了步骤数,提高了收率,并且避免了繁琐的中间体分离步骤。