苯并[ b ]呋喃在一个锅中根据苯酚与溴炔烃的加成/钯催化的CH键结合官能化制备。苯酚与溴代炔烃的加成反应以高收率生成了具有优异区域和立体选择性的(Z)-2-溴乙烯基苯基醚。所获得的(Z)-2-溴乙烯基苯基醚随后通过分子内环化进行处理,通过钯催化的直接C–H键官能化,以高收率获得了2-取代的苯并[ b ]呋喃。重要的是要注意,可以将溴代炔烃将苯酚转化为苯并[ b ]呋喃,可以通过简单而有效的串联程序在一个罐中进行。
Mechanistic Insights on Orthogonal Selectivity in Heterocycle Synthesis
作者:Arun Maji、Yernaidu Reddi、Raghavan B. Sunoj、Debabrata Maiti
DOI:10.1021/acscatal.8b02537
日期:2018.11.2
Recently, we have developed a method for catalytic regioselectivesynthesis of 2-substituted and 3-substituted benzofurans starting from phenols. The choice of reacting partner, olefin versus α,β-unsaturated acid, is critical to dictate the isomeric product formation. Instances are known where these olefinic partners did not complement each other and yield a similar outcome. In the current work, we
A concise route to functionalized benzofurans directly from gem-dibromoalkenes and phenols
作者:Maddali L. N. Rao、Priyabrata Dasgupta
DOI:10.1039/c5ra13213d
日期:——
A tandem strategy for the construction of benzofuran motifs has been developed directly from gem-dibromoalkenes and phenols under palladium-catalyzed conditions.