Pd-Catalyzed N-Arylation of Secondary Acyclic Amides: Catalyst Development, Scope, and Computational Study
作者:Jacqueline D. Hicks、Alan M. Hyde、Alberto Martinez Cuezva、Stephen L. Buchwald
DOI:10.1021/ja9044357
日期:2009.11.25
efficient N-arylation of acyclic secondary amides and related nucleophiles with aryl nonaflates, triflates, and chlorides. This method allows for easy variation of the aromatic component in tertiary aryl amides. A new biaryl phosphine with P-bound 3,5-(bis)trifluoromethylphenyl groups was found to be uniquely effective for this amidation. The critical aspects of the ligand were explored through synthetic, mechanistic
我们报告了无环仲酰胺和相关亲核试剂与芳基九氟甲磺酸酯、三氟甲磺酸酯和氯化物的有效 N-芳基化。这种方法可以很容易地改变叔芳基酰胺中的芳香族成分。发现具有 P 键合 3,5-(双) 三氟甲基苯基的新联芳基膦对这种酰胺化反应特别有效。通过合成、机械和计算研究探索了配体的关键方面。配体的系统变异揭示了 (1) 与磷相邻的“顶环”芳香碳上的甲氧基和 (2) 两个高度吸电子的 P 键合 3,5-(双) 三氟甲基苯基的重要性. 计算研究表明,配体的缺电子性质对于促进酰胺与 LPd(II)(Ph)(X) 中间体的结合很重要。