Asymmetric 1,3-dipolar cycloaddition of nitrite oxides to an acryloyl ester (1) derived from 1, 2:5, 6-di-O-isopropylidene glucose (6) was studied. Solvent and temperature effect was discussed. The single diastereoiso...Asymmetric 1,3-dipolar cycloaddition of nitrite oxides to an acryloyl ester (1) derived from 1, 2:5, 6-di-O-isopropylidene glucose (6) was studied. Solvent and temperature effect was discussed. The single diastereoisomer was isolated with high diastereoselective excess.展开更多
By screening the copper catalysts,ligands,and the reaction conditions,a simple CuCl/DMEDA/TEMPO catalyst system readily available from commercial sources is developed for a direct and selective synthesis of the useful...By screening the copper catalysts,ligands,and the reaction conditions,a simple CuCl/DMEDA/TEMPO catalyst system readily available from commercial sources is developed for a direct and selective synthesis of the useful nitriles by an aerobic oxidation reaction of primary amines using air as an advantageous oxidant under mild conditions.展开更多
A mild and efficient methodology for the direct oxidative synthesis of nitriles from easily available alcohols and aqueous ammonia by employing CuCI/DABCO/4-HO-TEMPO as the catalysts is described. This protocol uses t...A mild and efficient methodology for the direct oxidative synthesis of nitriles from easily available alcohols and aqueous ammonia by employing CuCI/DABCO/4-HO-TEMPO as the catalysts is described. This protocol uses the air as a green oxidant and aqueous ammonia as the nitrogen source at room temperature, A variety of aryl, heterocyclic and allylic alcohols are smoothly converted into the corresponding nitriles in good to excellent yields.展开更多
1 Results 1,3-Dipolar cycloaddition reaction is one of the most common methods for preparing various five membered heterocycles,and provides a conveniet protocols for constructing C-C bond with functional groups.The r...1 Results 1,3-Dipolar cycloaddition reaction is one of the most common methods for preparing various five membered heterocycles,and provides a conveniet protocols for constructing C-C bond with functional groups.The reaction has also been successfully used in the syntheses of C-glycosides and other sacharride derivatives.We wish to present herein our recent approaches on the synthesis of novel C-amino-glycosides,C-aminodisaccharides,spiro heterocyclic glycosides and heterocycle linked C-disaccharides,et...展开更多
文摘Asymmetric 1,3-dipolar cycloaddition of nitrite oxides to an acryloyl ester (1) derived from 1, 2:5, 6-di-O-isopropylidene glucose (6) was studied. Solvent and temperature effect was discussed. The single diastereoisomer was isolated with high diastereoselective excess.
基金NNSFC(Nos.51502174,21672163)ZJNSF(No.LR14B020002)+2 种基金Postdoctoral Science Foundation of China(Nos.2015 M582401,2016M592520)for financial supportpartially supported by Science and Technology Project of Shenzhen(Nos.JCYJ20150324141711616,JCYJ20150626090504916)Science and Technology Planning Project of Guangdong Province(No.2016B050501005)
文摘By screening the copper catalysts,ligands,and the reaction conditions,a simple CuCl/DMEDA/TEMPO catalyst system readily available from commercial sources is developed for a direct and selective synthesis of the useful nitriles by an aerobic oxidation reaction of primary amines using air as an advantageous oxidant under mild conditions.
文摘A mild and efficient methodology for the direct oxidative synthesis of nitriles from easily available alcohols and aqueous ammonia by employing CuCI/DABCO/4-HO-TEMPO as the catalysts is described. This protocol uses the air as a green oxidant and aqueous ammonia as the nitrogen source at room temperature, A variety of aryl, heterocyclic and allylic alcohols are smoothly converted into the corresponding nitriles in good to excellent yields.
基金Supported by the National Natural Science Foundations of China(20475015 ,20672027)
文摘1 Results 1,3-Dipolar cycloaddition reaction is one of the most common methods for preparing various five membered heterocycles,and provides a conveniet protocols for constructing C-C bond with functional groups.The reaction has also been successfully used in the syntheses of C-glycosides and other sacharride derivatives.We wish to present herein our recent approaches on the synthesis of novel C-amino-glycosides,C-aminodisaccharides,spiro heterocyclic glycosides and heterocycle linked C-disaccharides,et...
