Synthesis of Akt Inhibitor Ipatasertib. Part 1. Route Scouting and Early Process Development of a Challenging Cyclopentylpyrimidine Intermediate
作者:Jonathan W. Lane、Keith L. Spencer、Sagar R. Shakya、Nicholas C. Kallan、Peter J. Stengel、Travis Remarchuk
DOI:10.1021/op500271w
日期:2014.12.19
Herein, the route scouting and early process development of a key cyclopentylpyrimidine ketone intermediate toward the synthesis of Akt inhibitor Ipatasertib are described. Initial supplies of the intermediate were prepared through a method that commenced with the natural product (R)-(+)-pulegone and relied on the early construction of a methyl-substituted cyclopentyl ring system. The first process
在此,描述了关键的环戊基嘧啶酮中间体向Akt抑制剂Ipatasertib合成的路线探索和早期工艺开发。中间体的初始供应量是通过从天然产物(R)-(+)-pulegone,并依赖于甲基取代的环戊基环系统的早期构建。本文详述的第一种工艺化学路线能够合成100克规模的酮,但对于必需的多千克量的这种化合物的必需生产是不可行的,因此有必要探索其他策略。研究了几种新的合成方法,以制备外消旋或手性形式的环戊基嘧啶酮,从而发现了一条更实际的路线,该路线取决于初始制备高度取代的二羟基嘧啶化合物。然后通过关键的羰基化酯化反应和随后的串联Dieckmann环化-脱羧序列,在外消旋合成中证明了目标中的环戊烷环。该概念证明后来发展为环戊基嘧啶酮的不对称合成,将在随后的论文中与伊帕替替尼的合成一起进行描述。