中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | Benzyl 2,3,4-Tri-O-acetyl-β-D-xylopyranoside | 10548-53-5 | C18H22O8 | 366.368 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | Benzyl 2,3-O-isopropylidene-4-O-(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-β-D-xylopyranoside | 138479-79-5 | C29H38O14 | 610.612 |
—— | Benzyl 2,3-O-isopropylidene-4-O-(2,3,4,6-tetra-O-benzoyl-β-D-galactopyranosyl)-β-D-xylopyranoside | 138479-80-8 | C49H46O14 | 858.896 |
—— | benzyl O-(2,3,4,6-tetra-O-benzoyl-β-D-galactopyranosyl)-(1-4)-β-D-xylopyranoside | 142048-02-0 | C46H42O14 | 818.831 |
—— | O-β-D-galactopyranosyl-(1-4)-β-D-xylopyranose | 100227-08-5 | C11H20O10 | 312.274 |
The treatment of benzyl 2,3-O-isopropylidene-β-L-xylopyranoside with N-hydroxyphthalimide under Mitsunobu conditions, followed by protecting-group interchange, gave benzyl 4-O-[(tert-butoxycarbonyl)amino]-2,3- O-isopropylidene-α-D-arabinoside. Mild acid hydrolysis and catalytic hydrogenolysis afforded 4-O-[(tert-butoxycarbonyl)amino]-D-arabinose that, upon heating in water, gave the dihydrooxazine [(4R,5S,6R)-5,6-dihydro-4,5-dihydroxy-6-hydroxymethyl-4H-1,2-oxazine] as a crystalline solid. A single-crystal structure determination of this solid showed it to exist in the 5H6 conformation. Reduction of the dihydrooxazine gave the tetrahydrooxazine [(4R,5S,6R)-4,5-dihydroxy-6-hydroxymethyl-3,4,5,6-tetrahydro-2H-1,2-oxazine]. The dihydrooxazine was an effective inhibitor of two β-glucosidases (Ki = 27 and 35 µM). Benzyl 2,3-O-isopropylidene-β-L-xylopyranoside, via the derived imidazylate, was converted into a nitrile that, upon reduction and protecting-group manipulations, gave benzyl 4-C-aminomethyl-4-deoxy-α-D-arabinoside. Treatment of this amine with hydrogen and palladium-on-carbon gave isofagomine.Key words: dihydrooxazine, tetrahydrooxazine, isofagomine, iminosugars, glycosidase inhibitors.
Xylose is the optimal substrate for β4GalT7, an essential enzyme in GAG biosynthesis, but analogs act as effective inhibitors.