Chemoenzymatic synthesis of enantiomerically enriched diprophylline and xanthinol nicotinate
作者:Paweł Borowiecki、Mateusz Młynek、Maciej Dranka
DOI:10.1016/j.bioorg.2020.104448
日期:2021.1
A concise chemoenzymatic route toward enantiomerically enriched active pharmaceutical ingredients (API) – diprophylline and xanthinol nicotinate – is reported for the first time. The decisive step is an enantioselective lipase-mediated methanolysis of racemic chlorohydrin-synthon acetate, namely 1-chloro-3-(1,3-dimethyl-2,6-dioxo-1,2,3,6-tetrahydro-7H-purin-7-yl)propan-2-yl acetate, performed under
首次报道了一种针对富含对映体的活性药物成分 (API)——diprophylline 和 xanthinol nicotinate 的简明化学酶途径。的决定性步骤是外消旋氯醇合成子乙酸盐,即1-氯-3-(1,3-二甲基-2,6-二氧代-1,2,3,6-四氢-7-的对映选择性脂肪酶介导的甲醇分解ħ - purin-7-yl)propan-2-yl醋酸盐,在动力学控制条件下进行,制备规模为 500 mg。使用来自南极念珠菌的B 型脂肪酶进行对映异构体拆分,在反应对映选择性方面获得了最佳结果 ( E = 14)固定在丙烯酸树脂(CAL-B,Novozym 435)上,悬浮在同相乙腈-甲醇混合物中。精心设计的生物催化系统提供了关键的氯醇中间体(71% ee 和 38% 产率),然后将其顺利转化为富含对映体的活性剂:( R )-(-)-diprophylline (57% ee) 和 ( S )-(