Development of a Scaleable Synthesis of a Geminal Dimethyl Tertiary Amine as an Inhaled Muscarinic Antagonist for the Treatment of COPD
作者:Barry R. Dillon、Dannielle F. Roberts、David A. Entwistle、Paul A. Glossop、Craig J. Knight、Daniel A. Laity、Kim James、Celine F. Praquin、Ross S. Strang、Christine A. L. Watson
DOI:10.1021/op200233r
日期:2012.2.17
An efficient and scalable process for the synthesis of muscarinic antagonist, PF-3635659 1, is described, illustrating redesign of an analogue-targeted synthesis which contained a scale-limiting rhodium-activated C H amination step. The final route includes a reproducible modified Bouveault reaction which has not previously been reported on a substrate of this complexity, or on such a scale with over 5 kg of the requisite gem-dimethylamine prepared via this methodology.