Cyclodeshydration d'alcool-phenols induite par l'h.m.p.a. nouvelle voie d'acces aux dihydrobenzofurannes et dihydrobenzopyrannes
作者:C. Gervais、D. Anker、G. Carret、H. Pacheco
DOI:10.1016/0040-4020(79)80090-3
日期:1979.1
Substituted benzodihydrofurans and benzodihydropyrans 2 were obtained by heating alcohol-phenols 1 in HMPA. New cyclic alkyl phenyl dimethylaminophosphoramidates 3 were also isolated. Their thermolysis was studied. This and other considerations show that bis(dimethylamino)phenol alkyl phosphorodiamidate 4 and by-product 3 are intermediates of an alternative two or threestep reaction pathway. This mechanistic
通过在HMPA中加热醇-苯酚1获得取代的苯并二氢呋喃和苯并二氢吡喃2。还分离出新的环状烷基苯基二甲基氨基膦酰胺酸酯3。研究了它们的热分解。这种和其他考虑表明,双(二甲基氨基)苯酚烷基二氨基氨基磷酸酯4和副产物3是替代的两步或三步反应途径的中间体。这项机理研究为这种新型环脱水方法的最佳实验条件的选择提供了指示。