Vanadium-Catalyzed Asymmetric Epoxidation of Allylic Alcohols in Water
作者:Andrei V. Malkov、Louise Czemerys、Denis A. Malyshev
DOI:10.1021/jo900294h
日期:2009.5.1
Asymmetric V-catalyzed epoxidation of allylic alcohols can be carried out in water with chiral ligands, which incorporate sulfonamide and hydroxamic acid fragments. Furthermore, the reaction, notorious for its ligand-deceleration effect, in water turned into the ligand-accelerated process. By using this aqueous protocol, a range of allylic alcohols were epoxidized with up to 94% ee.
The reaction of primary, secondary, phenyl, allyl, and benzyl trityl ethers with lithium chloride in methanol at reflux led to deprotection of the trityl group affording the corresponding alcohol in good to excellent yields under mild reaction conditions.
Metal free visible light driven oxidation of alcohols to carbonyl derivatives using 3,6-di(pyridin-2-yl)-1,2,4,5-tetrazine (pytz) as catalyst
作者:Suvendu Samanta、Papu Biswas
DOI:10.1039/c5ra18151h
日期:——
A metal-free transformation of alcohols to the corresponding carbonyls in high yields under visible-light irradiation has been achieved at room temperature using di(pyridin-2-yl)-1,2,4,5-tetrazine (pytz) as catalyst.