Practical Chemoselective Acylation: Organocatalytic Chemodivergent Esterification and Amidation of Amino Alcohols with
<i>N</i>
‐Carbonylimidazoles
作者:Hope Nelson、William Richard、Hailee Brown、Abigail Medlin、Christina Light、Stephen T. Heller
DOI:10.1002/anie.202107438
日期:2021.10.11
DBU-catalyzed esterification: A single esterification product was obtained from a molecule containing primary aniline, alcohol, phenol, secondary amide, and N−H indole groups. These acylation reactions are highly practical as they involve only readily available, inexpensive, and relatively safe reagents; can be performed on a multigram scale; and can be used on carboxylic acids directly by in situ formation
化学选择性转化是高效有机合成的基石;然而,即使是简单的转化,如酰化反应,要实现这一目标也常常是一个挑战。我们报告说,N-羰基咪唑分别在吡啶鎓离子或 1,8-二氮杂双环 [5.4.0] undec-7-ene (DBU) 存在下能够催化化学发散的苯胺或醇酰化。两种酰化反应都显示出对目标基团的高而广泛的化学选择性。在 DBU 催化的酯化中观察到了前所未有的化学选择性水平:从含有伯苯胺、醇、苯酚、仲酰胺和N的分子中获得单一酯化产物-H吲哚基团。这些酰化反应非常实用,因为它们只涉及容易获得、便宜且相对安全的试剂;可以在多克规模上进行;并且可以通过原位形成酰基咪唑亲电试剂直接用于羧酸。