Process Development toward the Pilot Scale Synthesis of the Piperidine-Based Cocaine Analogue and Potent Dopamine and Norepinephrine Reuptake Inhibitor CTDP 31,446
作者:Bingidimi I. Mobele、Taryn Kinahan、Luckner G. Ulysse、Steven V. Gagnier、Michael D. Ironside、Graham S. Knox、Farahnaz Mohammadi
DOI:10.1021/op060114g
日期:2006.9.1
(+)-Methyl 4 beta-(4-chlorophenyl)-1-methylpiperidine-3 alpha-carboxylate hydrochloride ( CTDP 31,446) is known as a dopamine reuptake inhibitor. This cocaine analogue lacking the tropane skeleton is being considered for potential treatment of cocaine addiction. Herein we report the development of a scalable process for the preparation of this compound. This study was mainly aimed at improving the process throughput, eliminating chromatographic purifications for the separation of (+/-)-6-cis isomer from (+/-)-6-trans isomer, and developing a robust crystallization for isolation of pure (+/-)-6-cis in a single crop with a good mass recovery. The process development work also highlights an efficient recycle of (+/-)-6-trans via a kinetic epimerization followed by crystallization of the resulting (+/-)6- cis isomer. The resolution of (+/-)-6-cis and the crystallization of the final HCl salt were optimized and implemented to afford CTDP-31,446 with high purity and good mass recovery.
(+)-甲基4β-(4-氯苯基)-1-甲基哌啶-3α-羧酸盐盐酸盐(CTDP 31,446)是一种多巴胺再摄取抑制剂。这种不含托品烷骨架的古柯碱类似物正被考虑用于治疗古柯碱成瘾。本文报告了该化合物制备的可扩展工艺开发。本研究主要旨在提高工艺通量,消除色谱分离(用于分离 (+/-)-6-顺式异构体与 (+/-)-6-反式异构体),并开发一种稳健的结晶方法,以实现纯 (+/-)-6-顺式异构体的一次性分离,具有良好的收率。工艺开发工作还包括通过动力学异构化后结晶得到的 (+/-)-6-顺式异构体,实现 (+/-)-6-反式的高效回收。对 (+/-)-6-顺式的分离和最终HCl盐的结晶进行了优化和实施,以获得高纯度和良好收率的CTDP-31,446。