反应详情

2'-(2,3,4,6-Tetra-O-acetyl-α-D-glucopyranosyloxy)-6'-hydroxyacetophenone (5 g) and benzo[b]furan-5-carbaldehyde (1.81 g) are (i) treated in the same manner as in Example 1 to give crude 2'-(β-D-glucopyranosyloxy)-6'-hydroxy-3-(5-benzo[b]furanyl)acrylophenone, which is dissolved in a mixture of ethanol (50 ml) and a 10% aqueous potassium hydroxide solution (10 ml). The mixture is subjected to catalytic hydrogenation by using as a catalyst platinum oxide (120 mg) under atmospheric pressure. The catalyst is removed by filtration, and the filtrate is neutralized with a 10% hydrochloric acid under ice-cooling, and concentrated under reduced pressure. To the residue is added ethyl acetate, and the mixture is stirred, and the organic layer is collected; (ii) treated in the same manner as in Example 1 to give crude 2'-(β-D-glucopyranosyloxy)-6'-hydroxy-3-(5-benzo[b]furanyl)acrylophenone, which is dissolved in a mixture of ethanol (50 ml) and a 10% aqueous potassium hydroxide solution (10 ml). To the solution is added 4-N,N-diemethylaminopyridine (2.5 g) and the mixture is subjected to catalytic hydrogenation by using as a catalyst 10% palladium-carbon (1.1 g) under atmospheric pressure. The catalyst is removed by filtration, and the filtrate is neutralized with a 10% hydrochloric acid under ice-cooling, and concentrated under reduced pressure. To the residue is added ethyl acetate, and the mixture is stirred, and the organic layer is collected; or (iii) treated in the same manner as in Example 2, and the organic layer is collected.

1. additiontreated in the same manner as in Example 1
2. customto give crude 2'-(β-D-glucopyranosyloxy)-6'-hydroxy-3-(5-benzo[b]furanyl)acrylophenone, which
3. customThe catalyst is removed by filtration
4. temperaturecooling
5. concentrationconcentrated under reduced pressure
6. additionTo the residue is added ethyl acetate
7. customthe organic layer is collected
8. addition(ii) treated in the same manner as in Example 1