The development of a large-scale synthesis for (1S)-3-methyl-1-(2-piperidin-1-ylphenyl)butan-1-amine (S-(+)-1), a key intermediate of repaglinide (2), is described. The process conditions for S-(+)-1 involving nucleophilic substitution, Grignard
reaction, reduction and resolution were optimized and telescoped. The racemization of the undesired enantiomer R-(?)-1 offers a distinctive advantage in terms of cost and overall yield over the existing process. This communication also describes the control of a DcU byproduct
obtained during the condensation of S-(+)-1 with phenyl acetic acid derivative 3 in the synthesis of 2.
本文描述了(1S)-3-甲基-1-(2-哌啶-1-基苯基)丁-1-胺(S-(+)-1),瑞格列奈(2)的关键中间体的大规模合成的发展。优化并缩短了S-(+)-1的过程条件,包括亲核取代、Grignard反应、还原和分辨。与现有的方法相比,不需要的对映异构体R-(?)-1的消旋具有成本和总产率的显着优势。本文还描述了在S-(+)-1与苯乙酸衍生物3缩合合成2的过程中所得到的DcU副产物的控制。