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.
