Boron Trifluoride Etherate-Controlled Reactions of Methyl Enol Ethers: Selective Synthesis of Dihydrofuro[3,2-c]chromenone and Furo[3,2-c]chromenone Derivatives
作者:Faiz Ahmed Khan、Sarwat Asma Ziya Ahmad
DOI:10.1055/a-1912-3884
日期:——
A facile one-step synthetic approach to dihydrofuro-[3,2-c]chromenones and furo[3,2-c]chromenones by the reaction of methyl enol ethers with 4-hydroxycoumarins under metal-free conditions is presented. Dihydrofuro[3,2-c]chromenones and furo[3,2-c]-chromenones were selectively obtained by controlling the stoichiometry of boron trifluoride diethyl etherate. An unexpected aryl-group migration followed
提出了一种在无金属条件下通过甲基烯醇醚与 4-羟基香豆素反应来简便地一步合成二氢呋喃-[3,2- c ]色酮和呋喃[3,2 - c ]色酮的方法。通过控制三氟化硼乙醚合物的化学计量,选择性地得到二氢呋喃[3,2- c ]色酮和呋喃[3,2- c ]-色酮。据报道,芳基迁移后呋喃部分芳构化,导致各种呋喃[3,2- c ]色烯酮衍生物的收率良好。