The fluorescent D-glucose derivative, 2-deoxy-2-[(7-nitro-2,1,3-benzoxadiazol-4-yl)amino]-β-Dglucopyranose
(2-NBDG) is synthesized by reacting D-glucosamine with inexpensive 7-nitro-2,1,3-benzoxadiazol-4-yl
chloride (NBD-Cl). A series of reaction conditions such as reaction time, bases, the loading of bases, solvents and reaction
temperature has been investigated. The yield of 2-NBDG can be enhanced to 83.0% under the optimal reaction conditions.
Meanwhile, a gram-scale synthesis of 2-NBDG was also realized with 80.0% isolated yield.