additive-free cascade phosphorylation/cyclization of readily available 2-propynolphenols with R2P(O)OH (R = aryl, OPh, OBn) was developed for the construction of 2H-chromen-4-yl phosphinates/phosphonates and water as the only byproduct under mild conditions. The reaction was achieved by using R2P(O)OH as acid-promoter, but also as the phosphinate source with the formation of phosphorylation allene intermediate
开发了一种新颖的,无催化剂和无添加剂的,易于获得的2-
丙炔酚与R 2 P(O)OH(R =芳基,OPh,OBn)的级联
磷酸化/环化反应,用于构建2 H -chromen-4-yl
次膦酸酯/
膦酸酯和
水是在温和条件下唯一的副产物。通过使用R 2 P(O)OH作为酸
促进剂,但也作为
次膦酸酯源并形成
磷酸化
丙二烯中间体,并随后进行6-内-trig途径来实现反应。另外,该方法避免了使用危险的,对空气敏感的或活化的试剂,并且以良好的官能团耐受性和令人满意的产率表现良好。