Reusable and efficient polyvinylpolypyrrolidone-supported triflic acid catalyst for acylation of alcohols, phenols, amines, and thiols under solvent-free conditions
prepared and fully characterized by FT-IR, TGA, and SEM. This super acidic solid catalyst shows high catalytic activity for selective acylation of alcohols, phenols, amines, and thiols with anhydrides undersolvent-freeconditions at room temperature. In addition, this method features an easy to handle solid super acid catalyst and an operationally simple procedure, affording the desired acylated products
Visible light-induced transformation of aldehydes to esters, carboxylic anhydrides and amides
作者:Silvia Gaspa、Inês Raposo、Leonor Pereira、Gabriele Mulas、Pier Carlo Ricci、Andrea Porcheddu、Lidia De Luca
DOI:10.1039/c9nj01984g
日期:——
A transition metal- and organophotocatalyst free synthesis of esters, carboxylic anhydrides and amides from aldehydes induced by visible-light has been reported. The proposed methodology can be carried out by the use of sunlight or artificial visible light as a blue LED source. The methodology has a very broad applicability and the desired products are obtained in very satisfactory yields.
Nickel-Catalyzed α-Benzylation of Arylacetonitriles <i>via</i>
CO Activation
作者:Jing Xiao、Jia Yang、Tieqiao Chen、Li-Biao Han
DOI:10.1002/adsc.201500822
日期:2016.3.3
Efficient Ni‐catalyzeddirect cross‐couplings of benzylic alcohol derivatives with arylacetonitriles via CO activation are described. Various α‐benzylated arylacetonitriles including those with functional groups can be prepared undermild reaction conditions.
Nickel-catalyzed synthesis of (E)-olefins from benzylic alcohol derivatives and arylacetonitriles via C–O activation
作者:Jing Xiao、Jia Yang、Tieqiao Chen、Li-Biao Han
DOI:10.1039/c5cc10005d
日期:——
An efficient Ni-catalyzed synthesis of (E)-olefins using the readily available benzylic alcohol derivatives and arylacetonitriles is described. This transformation should proceed via a tandem process involving nickel-catalyzed cross coupling via C–O activation and subsequent stereoselective E2 elimination.
Erbium(III) triflate is a powerfulcatalyst for the acylation of alcohols and phenols. The reaction works well for a large variety of simple and functionalized substrates by using different kinds of acidicanhydrides Ac2O, (EtCO)2O, [(CH3)3CO]2O, Bz2O, and (CF3CO)2O} without isomerisation of chiral centres. Moreover, the catalyst can be easily recycled and reused without significant loss of activity