Photoenzymatic Hydrogenation of Heteroaromatic Olefins Using ‘Ene’‐Reductases with Photoredox Catalysts
作者:Yuji Nakano、Michael J. Black、Andrew J. Meichan、Braddock A. Sandoval、Megan M. Chung、Kyle F. Biegasiewicz、Tianyu Zhu、Todd K. Hyster
DOI:10.1002/anie.202003125
日期:2020.6.22
selective catalysts for the asymmetric reduction of activated alkenes. This function is, however, limited to enones, enoates, and nitroalkenes using the native hydride transfer mechanism. Here we demonstrate that EREDs can reduce vinyl pyridines when irradiated with visible light in the presence of a photoredoxcatalyst. Experimental evidence suggests the reaction proceeds via a radical mechanism where
N-Heterocyclic carbene (NHC) catalyzed chemoselective acylation of alcohols in the presence of amines with various acylating reagents
作者:Ramesh C. Samanta、Suman De Sarkar、Roland Fröhlich、Stefan Grimme、Armido Studer
DOI:10.1039/c3sc00099k
日期:——
subsequent acylation step. NHC-catalyzed selective acylation of benzyl alcohol in the presence of benzylamine can also be achieved with trifluoroethyl and hexafluoroisopropylesters as acylation reagents. Moreover, an enol acetate also shows high O-selectivity as a chemoselective acetylation reagent. Kinetic and mechanistic studies are provided and some examples of the chemoselectiveacylation of amino
chemoselective and enantioselective reactions. Their transformations, however, require pretreatment with highly reactive, toxic methylating reagents to facilitate C–C bondcleavage. Here, we demonstrate that such pretreatment can be avoided and the C–C bond cleaved under neutral conditions without the use of additional reagents or catalysts. The scope of the reaction, including the use of products reported in
The present invention relates to hydroximoyl-heterocycle derivatives, their process of preparation, intermediate compounds for their preparation, their use as fungicide active agents, particularly in the form of fungicide compositions, and methods for the control of phytopathogenic fungi, notably of plants, using these compounds or compositions.
Mechanism of the Cu<sup>II</sup>-catalyzed benzylic oxygenation of (aryl)(heteroaryl)methanes with oxygen
作者:Hans Sterckx、Johan De Houwer、Carl Mensch、Ignacio Caretti、Kourosch Abbaspour Tehrani、Wouter A. Herrebout、Sabine Van Doorslaer、Bert U. W. Maes
DOI:10.1039/c5sc03530a
日期:——
A mechanistic study of the copper-catalyzed oxidation of the methylenegroup of aryl(di)azinylmethanes was performed. Initial reaction rates were measured making use of in situ IR reaction monitoring and a kinetic analysis of the reaction was executed. The reaction proved to be first order in oxygen concentration. For substrate and acid concentration, saturation kinetics due to O2 mass transfer limitation