Manufacture of the PI3K β-Sparing Inhibitor Taselisib. Part 1: Early-Stage Development Routes to the Bromobenzoxazepine Core
作者:Travis Remarchuk、Rémy Angelaud、David Askin、Archana Kumar、Andrew S. Thompson、Hua Cheng、John F. Reichwein、Yanping Chen、Frédéric St-Jean
DOI:10.1021/acs.oprd.9b00049
日期:2019.5.17
Two convergent regioselective routes for the synthesis of the tetracyclic imidazobenzoxazepine triazole 1, a key intermediate toward the synthesis of taselisib, are described. In the first-generation route, a chemoselective Negishi cross-coupling reaction was developed between iodoimidazole 3 and triazole 7, which enabled the delivery of initial kilogram quantities of 1. Because of the inefficiencies
描述了用于合成四环咪唑并苯并a氮杂三唑1的两种会聚区域选择性途径,四环咪唑并苯并x杂三唑1是合成taselisib的关键中间体。在第一代路线中,碘代咪唑3和三唑7之间发生了化学选择性的Negishi交叉偶联反应,从而能够递送1千克的初始公斤。因为在咪唑的制备中低效率的3,通过α氯酮之间的高度选择性的咪唑环形成一个第二代路线11和芳基的脒12被开发。所得咪唑14提供了将两元N-烷基化和S N Ar串联反应有效地安装在一个锅中的七元苯并氮杂pine环系统的手柄。