Synthesis of Secondary Amides from<i>N</i>-Substituted Amidines by Tandem Oxidative Rearrangement and Isocyanate Elimination
作者:Pradip Debnath、Mattijs Baeten、Nicolas Lefèvre、Stijn Van Daele、Bert U. W. Maes
DOI:10.1002/adsc.201400648
日期:2015.1.12
The periodinane reagents are obtained from the commercially available phenyliodine(III) diacetate [PhI(OAc)2, (PIDA)] by ligand exchange with carboxylic acids. The N‐substituted amidine substrates are easily synthesized from readily available nitriles. The method is applicable for secondary amide synthesis, based on both aliphatic and (hetero)aromatic amines, including challenging amides consisting
在这项工作中,已经描述了将N-取代的idine转化为仲酰胺的有效串联过程。该过程涉及Ñ通过与双衬底的反应-acylurea形成(酰氧基)(苯基)-λ 3 -iodane随后的异氰酸酯的消除。通过与羧酸的配体交换从可商购的二乙酸苯基碘(III)苯乙酸[PhI(OAc)2(PIDA)]获得高碘烷试剂。该ñ预取代的idine底物很容易从容易获得的腈中合成。该方法适用于基于脂族和(杂)芳族胺的仲酰胺合成,包括由位阻酸和胺组成的挑战性酰胺。而且,该方案允许将目标酰胺(基于苯胺)中的空间体积与电子缺乏结合起来。基于涉及羧酸和胺的经典缩合反应,这样的化合物难以有效地合成。总体而言,在脂肪族和(杂)芳族体系中,合成方案都能将腈转化为仲酰胺。