Boron-Catalyzed N-Alkylation of Amines using Carboxylic Acids
作者:Ming-Chen Fu、Rui Shang、Wan-Min Cheng、Yao Fu
DOI:10.1002/anie.201503879
日期:2015.7.27
A boron‐based catalyst was found to catalyze the straightforward alkylation of amines with readily available carboxylic acids in the presence of silane as the reducing agent. Various types of primary and secondary amines can be smoothly alkylated with good selectivity and good functional‐group compatibility. This metal‐free amine alkylation was successfully applied to the synthesis of three commercial
An efficient, environmentally benign and unprecedented synthesis of various α-sulfenylated amides/esters has been developed under oxygen atmosphere. The reaction shows good functional group tolerance and excellent chemo/regioselectivity. All the desired products were obtained in moderate to excellent yields, even on the gram scale. Practically, the related α-thiol Weinreb amide can be readily transferred
Catalytic enantioselective [2,3] Stevens and Sommelet-Hauser rearrangements of α-diazo pyrazoleamides with sulfides were achieved by utilizing chiral N,N'-dioxide/nickel(II ) complex catalysts. These rearrangements proceeded well under mild reaction conditions, providing rapid and facile access to a series of functionalized 1,6-dicarbonyls or sulfane-substituted phenylacetates with high to excellent
Synthesis of Acetamide Derivatives using S-MWCNT and S-MC as an Efficient Heterogeneous Catalysts
作者:K. U Minchitha、H. N Hareesh、N Nagaraju、N Kathyayini
DOI:10.1166/jnn.2018.14563
日期:2018.1.1
carbon (S-MC) catalysts were prepared by wet impregnation method. These materials were characterized by different analytical techniques such as Powder-XRD, BET surface area analysis, SEM-EDS and TEM analysis to evaluate their bulk and surface properties. Surfaceacidity of the catalyst was measured by TPD-NH3 technique, as well as n-butyl aminetitration. The estimated surfaceacidity of S-MWCNT and
The invention concerns novel phenoxy- and phenylthio-acetyl derivatives of (4-amino-2,6-dimethylphenylsulphonyl)nitromethane and pharmaceutically acceptable salts thereof which are inhibitors of the enzyme aldose reductase and are of value, for example, in the treatment of certain peripheral effects of diabetes and galactosemia. Also disclosed are pharmaceutical compositions containing one of the derivatives and processes for the manufacture and use of the derivatives.