General Transition Metal-Free Synthesis of NH-Pyrroles from Secondary Alcohols and 2-Aminoalcohols
作者:Besir Krasniqi、Kayle Geerts、Wim Dehaen
DOI:10.1021/acs.joc.8b03215
日期:2019.5.3
A novel, transition metal-free and one-pot methodology to synthesize various substituted NH-pyrroles from readily available building blocks such as secondary alcohols and 2-aminoalcohols is described. The process is based on the venerable Oppenauer–Woodward oxidation, which uses benzophenone as an inexpensive reagent to achieve oxidation of secondary alcohols under mild condition to ketones, further
描述了一种新颖的,无过渡金属且一锅法的方法,该方法可从容易获得的结构单元(例如仲醇和2-氨基醇)中合成各种取代的NH-吡咯。该工艺基于古老的Oppenauer-Woodward氧化技术,该技术使用二苯甲酮作为廉价试剂,可在中等条件下将仲醇氧化成酮,再与氨基醇原位缩合,然后氧化环化成目标吡咯环。该反应在碱性条件下发生,具有广泛的底物范围,并具有对敏感官能团的良好耐受性。该方法可用于合成各种取代的吡咯,用作广泛应用的起始原料。