Completely N<sup>1</sup>-Selective Palladium-Catalyzed Arylation of Unsymmetric Imidazoles: Application to the Synthesis of Nilotinib
作者:Satoshi Ueda、Mingjuan Su、Stephen L. Buchwald
DOI:10.1021/ja2102373
日期:2012.1.11
The completely N(1)-selective Pd-catalyzed arylation of unsymmetric imidazoles with aryl halides and triflates is described. This study showed that imidazoles have a strong inhibitory effect on the in situ formation of the catalytically active Pd(0)-ligand complex. The efficacy of the N-arylation reaction was improved drastically by the use of a preactivated solution of Pd(2)(dba)(3) and L1. From these
描述了不对称咪唑与芳基卤化物和三氟甲磺酸酯的完全 N(1)-选择性 Pd 催化芳基化。这项研究表明,咪唑对催化活性Pd(0)-配体配合物的原位形成具有很强的抑制作用。通过使用 Pd(2)(dba)(3) 和 L1 的预活化溶液,N-芳基化反应的效率得到了显着提高。从这些发现可以清楚地看出,虽然咪唑可以阻止 L1 与 Pd 的结合,但一旦配体与金属结合,这些杂环就不会取代它。本催化系统的实用性通过临床上重要的酪氨酸激酶抑制剂尼罗替尼的区域选择性合成得到证明。