During preparation of a series of diphenyl ethers it was observed that displacement of an activated aryl fluoride with ortho-hydroxyacetophenone afforded a product that was C-arylated adjacent to the ketone. Evidence suggested this product was formed by Smiles rearrangement of an O-arylated intermediate. (C) 2004 Elsevier Ltd. All rights reserved.
Acyl Radical Smiles Rearrangement To Construct Hydroxybenzophenones by Photoredox Catalysis
作者:Junzhao Li、Zhengyi Liu、Shuang Wu、Yiyun Chen
DOI:10.1021/acs.orglett.9b00353
日期:2019.4.5
hydroxybenzophenones under mild and metal-free conditions is reported. Using the dual catalysis of hypervalentiodine(III) reagents and organophotocatalysts, ketoacids readily generate acyl radicals and undergo 1,5-ipso addition. This method can construct electron-deficient and electron-rich hydroxybenzophenones with excellent chemoselectivity and on gram scale. The performance of the reaction in neutral aqueous conditions