Copper-Catalyzed Remote sp3 C−H Chlorination of Alkyl Hydroperoxides
摘要:
A copper-catalyzed methodology to functionalize remote sp(3) C-H bonds in alkyl hydroperoxides is presented. The atom-transfer chlorination utilizes simple ammonium chloride salts as the chlorine source, and the internal redox process requires no external redox reagents.
Iridium-catalyzed crossed aldol coupling and a new concept to form an Ir–Si species
摘要:
[Ir(COD)(PPh3)(2)]X (X=PF6, ClO4, and OTf) activated by H-2 molecule catalyzes Mukaiyama-type aldol coupling between enoxysilanes and acetals or aldehydes. An Ir-Si species formed in the first stage of the catalytic cycle plays an important role in these reactions. (C) 2000 Elsevier Science Ltd. All rights reserved.
Catalyst-Controlled Wacker-Type Oxidation: Facile Access to Functionalized Aldehydes
作者:Zachary K. Wickens、Kacper Skakuj、Bill Morandi、Robert H. Grubbs
DOI:10.1021/ja411749k
日期:2014.1.22
The aldehyde-selective oxidation of alkenes bearing diverse oxygen groups in the allylic and homoallylic position was accomplished with a nitrite-modifiedWackeroxidation. Readily available oxygenated alkenes were oxidized in up to 88% aldehyde yield and as high as 97% aldehyde selectivity. The aldehyde-selective oxidation enabled the rapid, enantioselective synthesis of an important pharmaceutical
Direct organocatalytic hydroalkoxylation of α,β-unsaturated ketones
作者:Dhevalapally B. Ramachary、Rumpa Mondal
DOI:10.1016/j.tetlet.2006.08.134
日期:2006.10
The direct addition of a variety of alcohols to in situ activated olefins was observed in the presence of mild bifunctional amine/acid catalysts. Unlike existing methods, the reactions proceed at room temperature and in the absence of transition metals. The use of simple commercially available catalysts, amines and acids makes this an attractive method for the preparation of beta-alkoxy ketones, which are prevalent targets and intermediates in organic synthesis. (c) 2006 Elsevier Ltd. All rights reserved.
Copper-Catalyzed Remote sp<sup>3</sup> C−H Chlorination of Alkyl Hydroperoxides
作者:Rituparna Kundu、Zachary T. Ball
DOI:10.1021/ol100472t
日期:2010.6.4
A copper-catalyzed methodology to functionalize remote sp(3) C-H bonds in alkyl hydroperoxides is presented. The atom-transfer chlorination utilizes simple ammonium chloride salts as the chlorine source, and the internal redox process requires no external redox reagents.
Iridium-catalyzed crossed aldol coupling and a new concept to form an Ir–Si species
[Ir(COD)(PPh3)(2)]X (X=PF6, ClO4, and OTf) activated by H-2 molecule catalyzes Mukaiyama-type aldol coupling between enoxysilanes and acetals or aldehydes. An Ir-Si species formed in the first stage of the catalytic cycle plays an important role in these reactions. (C) 2000 Elsevier Science Ltd. All rights reserved.