Catalytic 1,3-Difunctionalisation of Organic Backbones through a Highly Stereoselective, One-Pot, Boron Conjugate-Addition/Reduction/Oxidation Process
作者:Cristina Solé、Amolak Tatla、Jose A. Mata、Andrew Whiting、Henrik Gulyás、Elena Fernández
DOI:10.1002/chem.201102081
日期:2011.12.9
enantioselectivity provided by the CuI catalyst modified with Josiphos‐ and Mandyphos‐type ligands has been examined. The oxidative substitution of the boryl unit with a hydroxyl group proceeds with complete retention of configuration at the Cβ‐atom. In parallel, the stoichiometric reduction of the imino or carbonyl group provides a second stereogenic centre. Depending on the nature of the reducing reagent
mpg-C<sub>3</sub>N<sub>4</sub>-Catalyzed Selective Oxidation of Alcohols Using O<sub>2</sub> and Visible Light
作者:Fangzheng Su、Smitha C. Mathew、Grzegorz Lipner、Xianzhi Fu、Markus Antonietti、Siegfried Blechert、Xinchen Wang
DOI:10.1021/ja102866p
日期:2010.11.24
Mesoporouscarbonnitride (mpg-C(3)N(4)) polymer can function as a metal-free photocatalyst to activate O(2) for the selective oxidation of benzyl alcohols with visiblelight, avoiding the cost, toxicity, and purification problems associated with corresponding transition-metal systems. By combining the surface basicity and semiconductor functions of mpg-C(3)N(4), the photocatalytic system can realize
Osmium (VI) catalyzed chemoselective oxidation of allylic and benzylic alcohols
作者:Shekaraiah Devari、Ramesh Deshidi、Manjeet Kumar、Arvind Kumar、Simmi Sharma、Masood Rizvi、Manoj Kushwaha、Ajai Prakash Gupta、Bhahwal Ali Shah
DOI:10.1016/j.tetlet.2013.09.036
日期:2013.11
A mild and highly chemoselective approach to oxidation of allylic, electron rich/deficient benzylic, and heterocyclic alcohols employing catalytic quantities of K-2[OsO2(OH)(4)] (3 mol %) and chloramine-T (50 mol %) is described. The protocol offers short reaction times (25 min-2 h), controlled oxidation, and tolerance to a variety of substrates. A systematic mechanistic study based on the LC-ESI-MS/MS reveals the presence of imidotriooxoosmium species which further reacts with alcohol to give the oxidized product. (C) 2013 Elsevier Ltd. All rights reserved.
Visible light mediated chemo-selective oxidation of benzylic alcohols
作者:Shekaraiah Devari、Masood Ahmad Rizvi、Bhahwal Ali Shah
DOI:10.1016/j.tetlet.2016.06.046
日期:2016.7
A highly chemoselective visible light mediated strategy has been developed for oxidation of benzylic alcohols. The method circumvents the use of toxic metal catalysts, high energy light source, and operates at room temperature. Furthermore reaction is easily scalable to gram levels.
Cobalt-Catalyzed Intramolecular Silylperoxidation of Unsaturated Diisopropylsilyl Ethers
作者:Jonathan P. Oswald、K. A. Woerpel
DOI:10.1021/acs.joc.9b00642
日期:2019.6.21
A cobalt-catalyzed intramolecular silylperoxidation reaction was developed that allows for the conversion of unsaturated diisopropylsilyl ethers to 3-sila-1,2,4-trioxepanes. Reduction of the peroxide unit of the 3-sila-1,2,4-trioxepane yields six-membered ring diisopropylsilylene acetals.