Continuous Flow Synthesis and Purification of Aryldiazomethanes through Hydrazone Fragmentation
作者:Éric Lévesque、Simon T. Laporte、André B. Charette
DOI:10.1002/anie.201608444
日期:2017.1.16
often contaminated with other reagents and by‐products, making it incompatible with many applications, especially in catalysis. Herein is reported a metal‐free continuous flow method for the production of aryldiazomethane solutions in a non‐coordinating solvent from easily prepared, bench‐stable sulfonylhydrazones. All by‐products are removed by an in‐line aqueous wash, leaving a clean, base‐free diazo
富电子的重氮化合物(例如芳基重氮甲烷)是合成复杂结构的有力试剂,但与它们的毒性和不稳定性相关的风险通常会限制其使用。流动化学技术可以避免这些问题,因为可以在生产过程中使用危险中间体,从而避免了积累和处理。不幸的是,产生的物流经常被其他试剂和副产物污染,使其与许多应用不兼容,特别是在催化方面。本文报道了一种无金属连续流动法,该方法用于从易于制备的,台式稳定的磺酰基hydr在非配位溶剂中生产芳基重氮甲烷溶液。通过在线水洗除去所有副产物,留下干净的无碱重氮物流。