OMS-2 for Aerobic, Catalytic, One-pot Alcohol Oxidation-Wittig Reactions: Efficient Access to α,β-Unsaturated Esters
作者:Jagadeswara R. Kona、Cecil K. King'ondu、Amy R. Howell、Steven L. Suib
DOI:10.1002/cctc.201300942
日期:2014.3
found to be highly active for obtaining α,β‐unsaturated esters (up to 95 % yield and with high diastereoselectivities) from a variety of benzyl, heteroaryl, allyl and alkyl alcohols via one‐pot alcohol oxidation‐Wittigreaction. The transformation utilizes air as the stoichiometric oxidant, and the inexpensive catalyst can be recovered and reused.
Facile synthesis of α, β-unsaturated esters through a one-pot copper-catalyzed aerobic oxidation-Wittig reaction
作者:Cheng Ren、Zhenyu Shi、Weijie Ding、Zhiqing Liu、Huile Jin、Xiaochun Yu、Shun Wang
DOI:10.1016/j.tetlet.2017.09.020
日期:2018.1
An efficient one-pot synthesis of α, β-unsaturated estersthrough the aerobic oxidation – Wittig tandem reaction of alcohols and phosphorous ylide is developed. This new method operates under mild reaction conditions, and uses CuI/TEMPO (TEMPO = 2,2,6,6-tetramethylpiperidine-N-oxyl) as co-catalyst and air (O2) as the oxidant. It tolerates a wide range of functionalized benzylic alcohol and aliphatic
The acid accelerated ruthenium-catalysed dihydroxylation. Scope and limitations
作者:Bernd Plietker、Meike Niggemann、Anja Pollrich
DOI:10.1039/b316546a
日期:——
Recently, we discovered a significant rate acceleration in RuO4-catalysed dihydroxylations of olefins by addition of Brönsted-acids resulting in a reduction of the catalyst loading to only 0.5 mol%. The present paper gives a full account on the optimisation protocol that led to the discovery of the beneficial influence of protic acids. A strong focus is set on the detailed description of the influence of different reaction parameters on both reactivity and selectivity. In the second part an intense investigation of scope and limitations will be presented. The results provided in this manuscript might lead to a deeper understanding of competing processes that influence the selectivity in RuO4-catalysed dihydroxylations.
The present invention relates to compounds of formula (I)
1
The compounds are useful in the treatment and/or prevention of conditions mediated by nuclear receptors, in particular the Peroxisome Proliferator-Activated Receptors (PPAR).