Synthetic optimization of rosiglitazone and related intermediates for industrial purposes
作者:Ge Meng、Meilin Zheng、Mengshu Dong、Yang Gao、Aqun Zheng、Zhenyu Li、Ruizhi Hu
DOI:10.1007/s11164-015-2132-0
日期:2016.3
As an important newly Food and Drug Administration (FDA)-approved drug for treating diabetes, rosiglitazone (1) has received much attention from researchers in many areas. To search for an economical and convenient synthesis method for 1, we explored the reaction conditions and workup of a scalable five-step synthetic route by an orthogonal method to determine the best condition for each reaction step. The starting materials are commercially available, including 2-chloropyridine (2), N-methylethanolamine (3), 4-fluorobenzaldehyde (4a) or 4-hydroxybenzaldehyde (4b), and 1,3-thiazolidine-2,4-dione (5). The five sequential reaction steps are cyclization, alkylation, etherification, condensation, and reduction, having optimal yield of 90, 99, 59, 75, and 91 %, respectively. The best overall yield to synthesize rosiglitazone based on compound 2 was 40 %, being suitable for industrial purposes, using water as a green solvent and avoiding column chromatography during the last three reaction steps.
作为一种重要的、新近获得美国食品药品监督管理局(FDA)批准的糖尿病治疗药物,罗格列酮(1)受到了众多领域研究人员的广泛关注。为寻找一种经济便捷的合成罗格列酮的方法,我们采用正交方法探究了五步可扩展合成路线的反应条件和后处理工艺,以确定每一步反应的最佳条件。起始原料均为市售品,包括2-氯吡啶(2)、N-甲基乙醇胺(3)、4-氟苯甲醛(4a)或4-羟基苯甲醛(4b)以及1,3-噻唑烷-2,4-二酮(5)。该五步连续反应分别为环化、烷基化、醚化、缩合和还原,其最佳产率分别为90%、99%、59%、75%和91%。基于化合物2合成罗格列酮的最佳整体产率为40%,适合工业化生产,以水为绿色溶剂,在最后三步反应中避免使用柱层析。