4-Dimethylaminopyridine (DMAP), A Superior Mediator for Morita–Balylis–Hillman Reaction-Triggered Annulative Condensation of Salicylaldehydes and Acrylonitrile to Form 3-Cyano-2<i>H</i>-chromenes
作者:Bubwoong Kang、Kaede Ikeda
DOI:10.1248/cpb.c23-00068
日期:2023.4.1
We unveiled superior base mediators for the annulative condensation of salicylaldehydes and acrylonitrile to give 3-cyano-2H-chromenes, which has been mediated only by 1,4-diazabicyclo[2.2.2]octane (DABCO) over the past two decades. The reactions were most efficiently mediated by 4-dimethylaminopyridine (DMAP), which yielded 3-cyano-2H-chromenes in higher yields than DABCO in most cases. We also confirmed
我们揭示了用于水杨醛和丙烯腈环状缩合生成 3-cyano-2 H -chromene 的高级碱介质,在过去的二十年中,它仅由 1,4-二氮杂双环 [2.2.2] 辛烷 (DABCO) 介导。这些反应最有效地由 4-二甲氨基吡啶 (DMAP) 介导,在大多数情况下,它产生的 3-cyano-2 H-色烯的产率高于 DABCO。我们还证实,在具有催化量的 DMAP 的十克规模实验中,该反应仍然保持高产率。该反应的效用还通过将获得的 3-cyano-2 H -chromene 衍生化为已知的 2 H -chromene-3-carboxylic 酸来举例说明,该酸先前是用不易获得的试剂合成的。 全尺寸图像