Cu(OAc)<sub>2</sub> Mediated Synthesis of 3-Sulfonyl Chromen-4-ones
作者:Meng-Yang Chang、Yu-Hsin Chen、Heui-Sin Wang
DOI:10.1021/acs.joc.8b00177
日期:2018.2.16
Copper acetate mediated (4 + 2) annulation of sulfonylacetylenes with salicylic acids provides sulfonyl chromen-4-ones in the presence of benzotriazol-1-yloxy tri(dimethylamino)phosphonium hexafluorophosphate (BOP, Castro’s reagent) and 4-dimethylaminopyridine (DMAP) in MeNO2 at reflux for 3 h. The uses of various metal complexes and activating reagents are investigated for facile and efficient transformation