Pd-Catalyzed CH Oxygenation with TFA/TFAA: Expedient Access to Oxygen-Containing Heterocycles and Late-Stage Drug Modification
作者:Gang Shan、Xinglin Yang、Linlin Ma、Yu Rao
DOI:10.1002/anie.201207458
日期:2012.12.21
Acid brings the oxygen: A generalmethod for palladium‐catalyzed CH oxygenation has been developed for the facilesynthesis of a wide range of functionalized phenols with readily available aryl ketones, benzoates, benzamides, acetanilides, and sulfonamides. A trifluoroacetic acid/trifluoroacetic acid anhydride solvent system serves as the oxygen source and is the critical factor for CH activation
Pd-Catalyzed sp2 C–H Hydroxylation with TFA/TFAA via Weak Coordinations
作者:Yu Rao
DOI:10.1055/s-0033-1339871
日期:——
An efficient sp2 C–H hydroxylation has been developed for the synthesis of a wide range of functionalized phenols with aryl ketones, benzoates, benzamides, acetanilides and sulfonamides through palladium(II) catalysis. A trifluoroacetic acid (TFA)/trifluoroacetic anhydride (TFAA) co-solvent system serves as the oxygen source and is the critical factor for weak coordination promoted C–H activation.
已开发出一种有效的 sp2 C-H 羟基化反应,用于通过钯 (II) 催化合成各种官能化酚与芳基酮、苯甲酸酯、苯甲酰胺、乙酰苯胺和磺酰胺。三氟乙酸(TFA)/三氟乙酸酐(TFAA)共溶剂体系作为氧源,是弱配位促进C-H活化的关键因素。
Rhodium-Catalyzed Directing-Group-Assisted Aldehydic C-H Arylations with Aryl Halides
作者:Maddali L. N. Rao、Boddu S. Ramakrishna
DOI:10.1002/ejoc.201700881
日期:2017.9.15
A broad scope for the synthesis of 2′‐substituted benzophenones was established involving directing group (OH or NHTs) assisted C–H arylation of aryl aldehydes with arylhalides under rhodium‐catalyzed conditions.
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