Acetyl Chloride–Silver Nitrate–Acetonitrile: A Reagent System for the Synthesis of 2-Nitroglycals and 2-Nitro-1-Acetamido Sugars from Glycals
摘要:
A new reagent system comprising acetyl chloride, silver nitrate, and acetonitrile has been developed for the synthesis of 2-nitroglycals from the corresponding glycals. Under certain conditions, the formation of 2-nitro-1-acetamido sugars has also been observed. In addition, a few other non-carbohydrate-derived olefins also gave the corrresponding conjugated nitroolefins.
The nitro-Michaeladdition of organolithium species to 2-nitroglycal derivatives was investigated. This methodology affords straightforward and stereoselectiveaccess to C-nitroglycosides, which are excellent precursors to C–N-acetylglycosamines. The corresponding products bearing an aromatic, heteroaromatic, alkynyl, alkenyl, or alkyl moiety were isolated in good yields with excellent selectivities
Stereoselective synthesis of fluorinated aminoglycosyl phosphonates
作者:Sanne Bouwman、Romano V. A. Orru、Eelco Ruijter
DOI:10.1039/c4ob02317j
日期:——
We describe the conjugate addition of lithiated difluoromethanephosphonates to a diverse range of nitroglycals as a convenient method for the highly stereoselective synthesis of fluorinated aminoglycosyl phosphonates. Our approach provides opportunities to produce hydrolytically stable mimics of biologically important aminoglycosyl phosphates.
Acetyl Chloride–Silver Nitrate–Acetonitrile: A Reagent System for the Synthesis of 2-Nitroglycals and 2-Nitro-1-Acetamido Sugars from Glycals
作者:Pavan K. Kancharla、Y. Suman Reddy、Suresh Dharuman、Yashwant D. Vankar
DOI:10.1021/jo200475h
日期:2011.7.15
A new reagent system comprising acetyl chloride, silver nitrate, and acetonitrile has been developed for the synthesis of 2-nitroglycals from the corresponding glycals. Under certain conditions, the formation of 2-nitro-1-acetamido sugars has also been observed. In addition, a few other non-carbohydrate-derived olefins also gave the corrresponding conjugated nitroolefins.
First synthesis of diethyl N-acetyl-glycosamine-1-difluoromethylphosphonate from 2-nitroglycals as phosphate analog
Herein, we report the first access to diethyl glycosamine-1-difluoromethylphosphate as phosphate mimic. The diethyl 2-nitro-glycosides-β-1-difluoromethylphosphonate were obtained from a Michael addition of diethyl(difluoro-(trimethylsilyl)methyl)phosphonate on 2-nitroglycals in the presence of a fluoride promoter in good to excellent yields. A subsequent reduction of the nitro group leads to the N-acetyl