phosphoranyl radical chemistry allows for precise cleavage of a stronger C-O bond and formation of a weaker C-Cbond by 1,5-aryl migration under mild reaction conditions. This new protocol is independent of substrate redox-potential, electronic, and substituent effects. It affords a general and promising access to 60 examples of synthetically versatile o-amino and o-hydroxy diaryl ketones under redox-neutral
A concise approach to the preparation of 2-hydroxydiarylketones by an intramolecular acyl radical ipso substitution
作者:William B Motherwell、Santiago Vázquez
DOI:10.1016/s0040-4039(00)01746-9
日期:2000.12
Substituted 2-hydroxydiarylketones have been simply prepared using an intramolecular acyl radical [1,6] ipsosubstitution reaction.
使用分子内酰基自由基[1,6] ipso取代反应可以简单地制备取代的2-羟基二芳基酮。
Chiral Phosphoric Acid Catalyzed Enantioselective Transfer Hydrogenation of ortho-Hydroxybenzophenone NH Ketimines and Applications
作者:Thanh Binh Nguyen、Qian Wang、Françoise Guéritte
DOI:10.1002/chem.201101694
日期:2011.8.22
Unprotected synthesis: The first enantioselective chiral phosphoric acid catalyzed transferhydrogenation of unprotected ortho‐hydroxybenzophenone NH imines by using a Hantzsch ester as the hydrogen source afforded the corresponding chiral N,O‐unprotected ortho‐hydroxydiarylmethylamines in high yields with excellent enantioselectivities (see scheme).
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
Photoinduced transition-metal- and external-photosensitizer-free intramolecular aryl rearrangement <i>via</i> C(Ar)–O bond cleavage
作者:Qian Dou、Chao-Jun Li、Huiying Zeng
DOI:10.1039/d0sc01585g
日期:——
halogen, and heteroaromatic rings. Control experiments suggested that the reaction proceeded via a photoinduced intramolecular heteroaryl/aryl rearrangement process involving photoexcitation of the aldehyde carbonyl group, radical addition, C–C bondformation and C(Ar)–O bond cleavage.