Development of an Improved Route for the Synthesis of an Abemaciclib Intermediate
作者:Michael P. Carroll、Harold Moloney、Olivia Gowran、Aoibheann O’Connor、Eoin M. Wilson、Michael M. Murray、Mark A. Pietz、Douglas P. Kjell、C. Brad Held、Michael O. Frederick
DOI:10.1021/acs.oprd.9b00347
日期:2019.11.15
A new synthesis for an intermediate of abemaciclib is described. Keys to this route are the use of inexpensive starting materials, biphasic amine alkylation for mild C–N bond formation, anhydrous coupling of a 2-chloropyridine derivative with LiHMDS to avoid a hydroxy impurity, and neutral, fluoride-free conditions to affect desilylation. Scale-up of the optimized conditions are described on a kilogram
描述了abemaciclib中间体的新合成方法。该途径的关键是使用廉价的原料,双相胺烷基化以形成温和的C–N键,2-氯吡啶衍生物与LiHMDS的无水偶联,避免羟基杂质以及中性,无氟化物的条件影响脱甲硅烷基化。优化条件的按比例放大以千克为单位进行描述。