A new, continuous-flow consecutive reduction method was developed for the C-N bond formation in the synthesis of the key intermediate of the antipsychotic drug cariprazine. The two-step procedure consists of a DIBAL-H mediated selective ester reduction conducted in a novel, miniature alternating diameter reactor, followed by reductive amination using catalytic hydrogenation on 5% Pt/C. The connection of the optimized modules was accomplished using an at-line extraction to prevent precipitation of the aluminum salt byproducts.
开发了一种新的连续流连续还原方法,用于合成抗精神病药物卡瑞普利辛的关键中间体中的C-N键形成。这个两步过程包括在一种新型微型交替直径反应器中进行的DIBAL-H介导的选择性酯还原,然后使用5% Pt/C上的催化氢化进行还原胺化反应。通过在线提取连接优化的模块,以防止铝盐副产物的沉淀。