Vinyltriphenylphosphonium salt mediated synthesis of functionalized coumarins
作者:Issa Yavari、Mehdi Adib、Leila Hojabri
DOI:10.1016/s0040-4020(01)00703-7
日期:2001.8
produced in the reaction between triphenylphosphine and dimethyl acetylenedicarboxylate by hydroquinone, resorcinol, catechol or pyrogallol leads to vinylphosphonium salts, which undergo Michael addition with the conjugate base of the hydroxy acid to produce highly functionalized 2-oxo-2H-chromene derivatives in good yields.