Metal-free cross-dehydrogenative coupling of aryl aldehydes to give symmetrical carboxylic anhydrides promoted by the TBHP/nBu4PBr system
作者:Mehdi Adib、Rahim Pashazadeh、Saideh Rajai-Daryasarei、Peiman Mirzaei、Seyed Jamal Addin Gohari
DOI:10.1016/j.tetlet.2016.05.069
日期:2016.7
A novel, efficient, and metal-free dual C–O bond formation reaction for the synthesis of carboxylic anhydrides from aryl aldehydes via cross-dehydrogenative coupling is described. Heating a mixture of aromatic aldehydes and an aqueous solution of tert-butyl hydroperoxide as oxidant in the presence of catalytic nBu4PBr in chlorobenzene at 80 °C for 3 h afforded the corresponding carboxylic anhydrides
描述了一种新颖,有效且无金属的双C-O键形成反应,用于通过交叉脱氢偶联由芳基醛合成羧酸酐。在催化性n Bu 4 PBr在氯苯中的存在下,于80°C加热芳香族醛和氢过氧化叔丁基水溶液作为氧化剂,在80°C下加热3 h,得到相应的羧酸酐,收率良好至优异。