A Unified Continuous Flow Assembly-Line Synthesis of Highly Substituted Pyrazoles and Pyrazolines
作者:Joshua Britton、Timothy F. Jamison
DOI:10.1002/anie.201704529
日期:2017.7.17
molecular diversity in short order. Continuous flow synthesis enables the safe handling of diazoalkanes at elevated temperatures, and the use of aryl alkyne dipolarphiles under catalyst-free conditions. This assembly-line synthesis provides a flexible approach for the synthesis of agrochemicals and pharmaceuticals, as demonstrated by a four-step, telescoped synthesis of measles therapeutic, AS-136A, in a total
已经开发出高度官能化的氟化吡唑和吡唑啉的快速且模块化的连续流合成方法。依次流过反应器线圈的氟化胺介导重氮烷的形成和[3 + 2]环加成,以伸缩方式生成30多种唑。然后通过进行N烷基化和芳基化,脱保护和酰胺化的其他反应器模块对吡唑核心进行顺序修饰,以在短期内实现广泛的分子多样性。连续流动合成能够在升高的温度下安全地处理重氮烷烃,并在无催化剂的条件下使用芳基炔烃偶极亲核试剂。这种流水线合成为农用化学品和药物的合成提供了一种灵活的方法,如麻疹治疗性,