BF3·OEt2 Catalyzed Cascade [4 + 2] Benzannulation of Vinyloxiranes with Coumarins to Construct Benzocoumarin Derivatives
作者:Yafei Wang、Yujia Wang、Jiaxin Qu、Tongtong Yang、Yining Zhang、Chunhao Yuan、Hongchao Guo、Chang Wang
DOI:10.1021/acs.joc.4c00742
日期:2024.7.5
BF3·OEt2-catalyzed cascade cyclization reaction of vinyloxirane with coumarin is described, affording the benzocoumarin derivatives with moderate to excellent yields (72–92%). The reaction demonstrates exceptional substrate tolerance and has been extensively explored for its potential in drug development, including scale-up experiments, functional group transformations, and screening of the products for anticancer
P(RNCH<sub>2</sub>CH<sub>2</sub>)<sub>3</sub>N: AN EFFICIENT PROMOTER FOR THE SYNTHESIS OF 3-SUBSTITUTED COUMARINS
作者:Philip Kisanga、Xiangshu Fei、John Verkade
DOI:10.1081/scc-120003602
日期:2002.1
The title compounds wherein R = Me or i-Pr function as efficient promoters for the formation of coumarins in good to excellent yields (80-95%) from salicylaldehydes and di-activated methylene compounds of the type R'CH2CO2Et (R'= CO2Et, COMe, CN). Although the yields are not generally superior to those reported in the literature, our methodology is more convenient in that milder conditions and shorter reaction times are facilitated by the use of the aforementioned commercially available catalysts.