Novel oxoisochromene synthesis<i>via</i>chemoselective O–H insertion of 1,3-dicarbonyl compounds and subsequent Pd-catalyzed intramolecular arylation reaction
作者:Harshita Singh Korawat、Manoj Kumar Saini、Karmdeo Prajapati、Ashok Kumar Basak
DOI:10.1039/d3nj02306k
日期:——
highly chemoselective O-alkylation reaction is the use of potassium enolate of 1,3-diketones as the base as well as the nucleophile in a highly polar-aprotic solvent at moderate temperature. These vinyl ethers are subsequently converted into novel oxoisochromene derivatives via Pd-catalyzed intramolecular arylation reaction. A plausible mechanism of the chemoselective O-alkylation reaction is outlined.
由于竞争性C烷基化反应,1,3-二酮的化学选择性O烷基化是一项艰巨的合成挑战。在本报告中,衍生自2-溴(杂)芳基醛的N-三甲苯基腙被用于在碱介导的无过渡金属条件下对环状1,3-二酮进行O-烷基化,以良好到高产率生成乙烯基醚。高化学选择性O-烷基化反应成功的关键是在中等温度下在高极性非质子溶剂中使用1,3-二酮烯醇钾作为碱以及亲核试剂。这些乙烯基醚随后通过以下途径转化为新型氧化异色烯衍生物:Pd催化的分子内芳基化反应。概述了化学选择性O -烷基化反应的合理机制。