作者:Jiaojiao Xu、Jin Cai、Junqing Chen、Xi Zong、Xuan Wu、Min Ji、Peng Wang
DOI:10.3184/174751916x14569294811333
日期:2016.4
A highly efficient method for the synthesis of baricitinib was developed. The starting material tert-butyl 3-oxoazetidine-1-carboxylate was converted to intermediate 2-(1-(ethylsulfonyl)azetidin-3-ylidene)acetonitrile via the Horner–Emmons reaction, deprotection of the N-Boc-group and a final sulfonamidation reaction. Then the nucleophilic addition reaction was carried out smoothly to afford the borate
开发了一种合成巴瑞替尼的高效方法。起始原料 3-氧代氮杂环丁烷-1-羧酸叔丁酯通过霍纳-埃蒙斯反应、N-Boc-基团的脱保护和最终反应转化为中间体 2-(1-(乙基磺酰基)氮杂环丁烷-3-亚基)乙腈磺酰胺化反应。然后在回流条件下,在1,8-二氮杂双环[5.4.0]十一碳-7-烯存在下,亲核加成反应顺利进行,得到硼酸盐中间体。最后,通过4-氯-7-H-吡咯并[2,3-d]嘧啶与上述硼酸盐中间体的Suzuki偶联反应得到所需化合物baricitinib。所有化合物均通过 IR、MS、1H NMR 和 13C NMR 进行表征。该合成路线的总收率高达49%。此外,这个程序很容易执行,