One-Step Synthesis of Isocoumarins and 3-Benzylidenephthalides via Ligandless Pd-Catalyzed Oxidative Coupling of Benzoic Acids and Vinylarenes
作者:Debkumar Nandi、Debalina Ghosh、Shih-Ji Chen、Bing-Chiuan Kuo、Nancy M. Wang、Hon Man Lee
DOI:10.1021/jo400174w
日期:2013.4.5
A straightforward synthetic method for the preparation of isocoumarins and 3-benzylidenephthalides via C–H olefination and oxidative coupling of readily available benzoicacids and vinylarenes was developed. The directing effect of the substituents on the benzoicacid allows for the synthesis of both types of lactone in pure form.
Ruthenium(II)‐Catalyzed Homocoupling of Weakly Coordinating Sulfoxonium Ylides via C−H Activation/Annulations: Synthesis of Functionalized Isocoumarins
作者:Ming‐Dong Zhou、Zhen Peng、He Wang、Zhao‐Hui Wang、Da‐Jin Hao、Lei Li
DOI:10.1002/adsc.201900764
日期:2019.11.19
Homocoupling of weaklycoordinating sulfoxonium ylides was accomplished via ruthenium (II) catalyzed C‐Hactivation process. This strategy provides a convenient, efficient and step‐economic method to access 3‐substituted isocoumarins with good functional group tolerance. The sulfoxonium ylide acts both as the convenient aromatic substrate and the acylmethylation reagent in this transformation. Moreover
A ruthenium(II)-catalyzed annulation between two molecules of sulfoxonium ylides is achieved, generating a variety of substituted isocoumarins in reasonable yields. This strategy features dual C-H/C-C activation in one pot and has a wide substrate scope and good functional group tolerance.