A concise route to access 5H-imidazo[2,1-a]isoindole heterofused compounds by copper（I）-catalyzed intra- molecular coupling of non-activated aryl bromides with azoles is reported. With CuI as catalyst, 1,10-phenanth...A concise route to access 5H-imidazo[2,1-a]isoindole heterofused compounds by copper（I）-catalyzed intra- molecular coupling of non-activated aryl bromides with azoles is reported. With CuI as catalyst, 1,10-phenanth- roline as ligand, and K3PO4 as base, the reactions of 1-（2-bromobenzyl）-IH-imidazoles in DMF/o-xylene （I ： 1, V ： V） at 145 ℃ afford the corresponding substituted 5H-imidazo[2,1-a]isoindoles in high yields via intramolecu- lar C-arylation.展开更多
This work describes stereoselective preparation ofβ-C-aryl/vinyl glucosides via mild Ni-catalyzed reductive arylation and vinylation of C1-glucosyl halides with aryl and vinyl halides.A broad range of aryl halides an...This work describes stereoselective preparation ofβ-C-aryl/vinyl glucosides via mild Ni-catalyzed reductive arylation and vinylation of C1-glucosyl halides with aryl and vinyl halides.A broad range of aryl halides and vinyl halides were employed to yield C-aryl/vinyl glucosides in 42%–93%yields.Good to excellentβ-selectivities were obtained for C-glucosides by using tridentate ligand.展开更多
2,3,4,6-Tetra-O-benzyl-D-glucopyranose l-a-(p-nitrobenzoate)reacted with aryl ethers in the presence of Lewis acid to give β-anomers stereoselectively in high yield, but reaction with 1,3- ditrimethylsilyloxybenzene ...2,3,4,6-Tetra-O-benzyl-D-glucopyranose l-a-(p-nitrobenzoate)reacted with aryl ethers in the presence of Lewis acid to give β-anomers stereoselectively in high yield, but reaction with 1,3- ditrimethylsilyloxybenzene gave a-anomer using BF_3.Et_2O and β-anomer using anhydrous AICl_3 as catalyst.展开更多
文摘A concise route to access 5H-imidazo[2,1-a]isoindole heterofused compounds by copper（I）-catalyzed intra- molecular coupling of non-activated aryl bromides with azoles is reported. With CuI as catalyst, 1,10-phenanth- roline as ligand, and K3PO4 as base, the reactions of 1-（2-bromobenzyl）-IH-imidazoles in DMF/o-xylene （I ： 1, V ： V） at 145 ℃ afford the corresponding substituted 5H-imidazo[2,1-a]isoindoles in high yields via intramolecu- lar C-arylation.
基金supported by the National Natural Science Foundation of China(21871173,21572140,21372151)
文摘This work describes stereoselective preparation ofβ-C-aryl/vinyl glucosides via mild Ni-catalyzed reductive arylation and vinylation of C1-glucosyl halides with aryl and vinyl halides.A broad range of aryl halides and vinyl halides were employed to yield C-aryl/vinyl glucosides in 42%–93%yields.Good to excellentβ-selectivities were obtained for C-glucosides by using tridentate ligand.
文摘2,3,4,6-Tetra-O-benzyl-D-glucopyranose l-a-(p-nitrobenzoate)reacted with aryl ethers in the presence of Lewis acid to give β-anomers stereoselectively in high yield, but reaction with 1,3- ditrimethylsilyloxybenzene gave a-anomer using BF_3.Et_2O and β-anomer using anhydrous AICl_3 as catalyst.
