Photochemical Cyclopropenation of Alkynes with Diazirines as Carbene Precursors in Continuous Flow
作者:Nour Tanbouza、Virginie Carreras、Thierry Ollevier
DOI:10.1021/acs.orglett.1c01750
日期:2021.7.16
carbenes from diazirine compounds is described. This reaction is performed in continuous flow using readily available LEDs under mild reaction conditions. This new and efficient method describes the synthesis of 25 examples of 3-trifluoromethyl-3-aryl-cyclopropenes with yields up to 97%, achieved in continuous flow with a 5 min residence time. Control experiments highlighted that diazirines are more efficient
描述了通过炔烃与从二氮丙啶化合物光解生成的卡宾的环丙烯化反应有效合成 3-三氟甲基-3-芳基-环丙烯。该反应是在温和的反应条件下使用现成的 LED 在连续流动中进行的。这种新的高效方法描述了 3-三氟甲基-3-芳基-环丙烯的 25 个实例的合成,产率高达97%,在连续流动中实现,停留时间为 5 分钟。对照实验强调,对于这种转化,二氮嗪比重氮化合物更有效。