Carbohydrate-based N-heterocyclic carbenes for enantioselective catalysis
作者:Alexander S. Henderson、John F. Bower、M. Carmen Galan
DOI:10.1039/c4ob02056a
日期:——
Versatile syntheses of C2-linked and C2-symmetric carbohydrate-based imidazol(in)ium salts from functionalised amino-carbohydrate derivatives are reported. The novel NHCs were ligated to [Rh(COD)Cl]2 and evaluated in Rh-catalysed asymmetrichydrosilylation of ketones with good yields and promising enantioselectivities.
Synthesis of Novel Glycosyl 1,3,4-Thiadiazole Derivatives
作者:Feng-Chang Cheng、Long Yin、Xiu-Jian Liu、Wei-Wei Liu、Zhi-Ling Cao、Da-Hua Shi、Lei Wang
DOI:10.3184/174751916x14738636315471
日期:2016.10
protocol for the synthesis of glycosyl 1,3,4-thiadiazole derivatives was developed, which involved the reaction of glycosyl isothiocyanate, hydrazine hydrate, and various aldehydes followed by oxidative cyclisation with ferric ammonium sulfate in methanol. 13 examples of different glycosyl 1,3,4-thiadiazole derivatives were prepared. Good yields (70–87%) have been achieved. The glycosyl 1,3,4-thiadiazole
Synthesis and bioactivity of novel C2-glycosyl triazole derivatives as acetylcholinesterase inhibitors
作者:Long Yin、Lei Wang、Xiu-Jian Liu、Feng-Chang Cheng、Da-Hua Shi、Zhi-Ling Cao、Wei-Wei Liu
DOI:10.1515/hc-2016-0163
日期:2017.6.27
Abstract New C2-glycosyl triazolederivatives 6a–l were synthesized by cyclization of glycosyl acylthiosemicarbazides 5 in refluxing 3 N sodium hydroxide aqueous solution. Substrates 5 were obtained by the reaction of glycosyl isothiocyanate 3 with various hydrazides. The acetylcholinesterase (AChE) inhibitory activities of compounds 6 were tested by Ellman’s method. Compounds that exhibited over 85%
Synthesis and Biological Evaluation of Novel Glycosyl-Containing 1,2,4-Triazolo[3,4-<i>b</i>][1,3,4]Thiadiazole Derivatives as Acetylcholinesterase Inhibitors
作者:Xiu-Jian Liu、Lei Wang、Long Yin、Feng-Chang Cheng、Hui-Min Sun、Wei-Wei Liu、Da-Hua Shi、Zhi-Ling Cao
DOI:10.3184/174751917x15064232103047
日期:2017.10
An efficient protocol for the synthesis of novel glycosyl-containing 1,2,4-triazolo[3,4-b][1,3,4]thiadiazole derivatives starting from the commercially available D-glucosamine hydrochloride is described by reaction of glycosyl isothiocyanate with various aminotriazoles in DMF. Glycosyl isothiocyanate is an important intermediate and synthetic methods are discussed. The acetylcholinesterase inhibitory