Continuous Platinum-Mediated Hydrogenation of <i>Refametinib</i>
Iodo-nitroaniline Key Intermediate DIM-NA: The Combined Challenges of Selectivity and Catalyst Deactivation
作者:Todor Baramov、Jorma Hassfeld、Michael Gottfried、Hermann Bauer、Tanja Herrmann、Mourad Ben Said、Stefan Roggan
DOI:10.1002/ejoc.201700625
日期:2017.7.25
chemoselective, continuous, multistep reduction of iodo-nitroaromatics in a fixed-bed hydrogenation reactor has been investigated. This transformation poses challenges upon both the catalyst and process conditions if high yields are to be achieved. First, the stability and selectivity of four flow-compatible Pt catalysts, Pt(X)/C (X = Fe, V), were investigated by using 1-iodo-4-nitrobenzene as the model
研究了固定床加氢反应器中碘硝基芳烃的化学选择性、连续、多步还原。如果要实现高产率,这种转变对催化剂和工艺条件都提出了挑战。首先,通过使用 1-碘-4-硝基苯作为模型底物研究了四种流动相容的 Pt 催化剂 Pt(X)/C (X = Fe, V) 的稳定性和选择性。碳上的颗粒状 Pt(Fe) 被确定为最有希望的候选者。使用这种催化剂,碘硝基芳族 API(活性药物成分)中间体 DIM-NA [(2,3-二氟-5-甲氧基-6-硝基苯基)(2-氟-4-碘苯基)胺] 可以转化为相应的在制备规模上具有高选择性的苯胺。紫外/可见光谱成功应用于在线转换控制,