Two Routes to 4-Fluorobenzisoxazol-3-one in the Synthesis of a 5-HT<sub>4</sub> Partial Agonist
作者:Daniel W. Widlicka、John C. Murray、Karen J. Coffman、Chunguang Xiao、Michael A. Brodney、Joseph P. Rainville、Brian Samas
DOI:10.1021/acs.oprd.5b00389
日期:2016.2.19
A potent 5-HT4 partial agonist, 1 (PF-04995274), targeted for the treatment of Alzheimer’s disease and cognitive impairment, has been prepared on a multi-kilogram scale. The initial synthetic route, that proceeded through a 4-substituted 3-hydroxybenzisoxazole core, gave an undesired benzoxazolinone through a Lossen-type rearrangement. Route scouting led to two new robust routes to the desired 4-substituted
已经以多千克规模制备了针对阿兹海默氏病和认知障碍的有效5-HT 4部分激动剂1(PF-04995274)。最初的合成路线是通过4-取代的3-羟基苯并恶唑核心进行的,通过Lossen型重排产生了不希望的苯并恶唑啉酮。路线搜寻导致两条新的稳健路线到达所需的4位取代核。流程开发导致在流程友好的条件下以中试工厂规模有效地组装API,并提高了产量。另外,开发了具有药学上有益特性的API的半酸盐的结晶以使得临床研究能够进行。