Modification of photochemical reactivity by cyclodextrin complexalion: product selectivity in photo-fries rearrangement
作者:M.S. Syamala、B.Nageswer Rao、V. Ramamurthy
DOI:10.1016/s0040-4020(01)86094-4
日期:1988.1
state and in aqueous solution brings about a remarkable regulation of the photo-Friesrearrangement of phenyl esters and anilides. In comparison to the nonselective mixture of ortho and para-rearranged isomers along with the deacylated product obtained in organic solvents, the solid β-cyclodextrin complexes of unsubstituted esters and anilides show a remarkable ‘ortho-selectivity’. An impressive regio-selectivity’
Synthesis of<i>ortho</i>-Acylphenols through the Palladium-Catalyzed Ketone-Directed Hydroxylation of Arenes
作者:Fanyang Mo、Louis J. Trzepkowski、Guangbin Dong
DOI:10.1002/anie.201207479
日期:2012.12.21
Ketone in charge: A formal ketone‐directed palladium‐catalyzed ortho‐hydroxylation of arenes has been developed as an effective approach to access o‐acylphenols from simple arylketones. A Pd‐catalyzed oxidative ortho‐carbonylation reaction using ketone directing groups to access a ketal–lactone motif is also demonstrated. The ubiquity and versatile nature of ketones make these methods attractive. BTI=PhI(TFA)2;
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