The rhodium-catalyzed intramolecular Ar–H/Ar–H coupling of 3-phenoxybenzoic acids proceeds smoothly, accompanied by double C–H bond cleavage at the 2- and 2′-positions, to produce dibenzofuran-1-carboxylic acid derivatives. Related tetra- and pentacyclic molecules can also be readily constructed by the present procedure. A reaction mechanism involving 1,4-rhodium(III) migration is proposed.
在
铑催化下,
3-苯氧基苯甲酸的分子内 Ar-H/Ar-H 偶联顺利进行,同时在 2- 和 2′-位发生双 C-H 键裂解,生成
二苯并呋喃-1-
羧酸衍
生物。相关的四环和五环分子也很容易通过本程序生成。提出了一种涉及 1,4-
铑(III)迁移的反应机理。