Cross-Coupling Methods for the Large-Scale Preparation of an Imidazole−Thienopyridine: Synthesis of [2-(3-Methyl-3H-imidazol-4-yl)- thieno[3,2-<i>b</i>]pyridin-7-yl]-(2-methyl-1H-indol-5-yl)-amine
作者:J. A. Ragan、J. W. Raggon、P. D. Hill、B. P. Jones、R. E. McDermott、M. J. Munchhof、M. A. Marx、J. M. Casavant、B. A. Cooper、J. L. Doty、Y. Lu
DOI:10.1021/op0340457
日期:2003.9.1
the Stille coupling and a Negishi cross-coupling of the organozinc reagent derived from 2-(tert-butyldimethylsilyl)-1-methylimidazole and iodothienopyridine (3). The latter procedure worked well on laboratory scale (<50 g), but was capricious upon scale-up. The issues with scale-up of an organostannane reagent are discussed, including control and analysis of organotin levels.
[2-(3-methyl-3H-imidazol-4-yl)-thieno[3,2-b]pyridin-7-yl]-(2-methyl-1H-indol-5-yl)的数百克合成)-胺 (1) 描述了利用碘噻吩并吡啶 (3) 与 5-(三丁基甲锡烷基)-1-甲基咪唑 (11) 的 Stille 交叉偶联。评估了几种交叉偶联方法将噻吩并吡啶 3 转化为咪唑-噻吩并吡啶 2,但只有两种方法有效:Stille 偶联和源自 2-(叔丁基二甲基甲硅烷基)-1- 的有机锌试剂的 Negishi 交叉偶联甲基咪唑和碘噻吩并吡啶 (3)。后一种方法在实验室规模 (<50 g) 上运行良好,但在放大时反复无常。讨论了有机锡烷试剂放大的问题,包括有机锡水平的控制和分析。