An Electrophilic Trifluoromethylthiolation of Silylenol Ethers and <i>β</i>
-Naphthols with Diethylaminosulfur Trifluoride and (Trifluoromethyl)trimethylsilane
作者:Perumal Saravanan、Pazhamalai Anbarasan
DOI:10.1002/adsc.201800366
日期:2018.8.6
efficient and general trifluoromethylthiolation of silylenol ethers and β‐naphthols have been accomplished employing the combination of diethylaminosulfur trifluoride (DAST) and (trifluoromethyl)trimethylsilane (CF3TMS) as source of electrophilic trifluoromethylthio moiety for the synthesis of α‐trifluoromethylthiolated carbonyl compounds and β‐naphthols in good yields. Important features of this method
Pt-Catalyzed Oxidative Rearrangement of Cyclic Tertiary Allylic Alcohols to Enones Using Aqueous Hydrogen Peroxide
作者:Takashi Nagamine、Yoshihiro Kon、Kazuhiko Sato
DOI:10.1246/cl.2012.744
日期:2012.7.5
An oxidative rearrangement of cyclic tertiary allylic alcohols to β-disubstituted α,β-unsaturated ketones by Pt black catalyst with aqueous hydrogen peroxide is described. The reaction proceeds under organic solvent- and halide-free conditions and gives only water as a coproduct. The Pt black catalyst is commercially available and can be reused at least four times.
Aerobic Oxidative Heck/Dehydrogenation Reactions of Cyclohexenones: Efficient Access to<i>meta</i>-Substituted Phenols
作者:Yusuke Izawa、Changwu Zheng、Shannon S. Stahl
DOI:10.1002/anie.201209457
日期:2013.3.25
catalyst, employing a 6,6′‐dimethyl‐2,2′‐bipyridine ligand, promotes both the aerobic oxidative Heck coupling and dehydrogenation reactions of cyclohexenones. These reactions may be combined in a one‐pot sequence to enable the straightforward synthesis of meta‐substituted phenols (see scheme).
Enzyme- and Ruthenium-Catalyzed Dynamic Kinetic Resolution of Functionalized Cyclic Allylic Alcohols
作者:Richard Lihammar、Renaud Millet、Jan-E. Bäckvall
DOI:10.1021/jo402086z
日期:2013.12.6
Enantioselective synthesis of functionalized cyclic allylic alcohols viadynamic kinetic resolution has been developed. Cyclopentadienylruthenium catalysts were used for the racemization, and lipase PS-IM or CALB was employed for the resolution. By optimization of the reaction conditions the formation of the enone byproduct was minimized, making it possible to prepare a range of optically active functionalized
A versatile approach to functionalized cyclic ketones bearing quaternary carbon stereocenters via organocatalytic asymmetric conjugate addition of nitroalkanes to cyclic β-substituted α,β-Enones
quaternary stereogeniccenters at β-C has been developed. This is an extension of the method that we developed during the total synthesis of (−)-haliclonin A, which features the employment of structurally relatively simple, cheap and easily available primary amine-thiourea derived from (R,R)-1,2-diaminocyclohexane as the chiral catalyst. The method shows wide substrate scope, good functional group tolerance