3-di-O-(4-methoxy- benzyl)-α-D-glucopyranosy bromide (15) was efficiently prepared from D-glucose in 8 steps. The first synthesis of 2'-O-(α-D-glucopyranosyl)biopterin (2) was achieved by treatment of the key precursor, N 2 -(N,N-dimethylamino- methylene)-1'-O-(4-methoxybenzyl)-3-(2-(4-nitrophenyl)ethyl)biopterin (6) with 15 in the presence of silver triflate and tetramethylurea, followed by removal of the protecting