中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 4,6-O-benzylidene-1-O-methyl-α-D-glucopyranoside | 3162-96-7 | C14H18O6 | 282.293 |
—— | methyl 2,3-anhydro-4,6-benzylidene-α-D-allopyranoside | 66537-92-6 | C14H16O5 | 264.278 |
—— | methyl 4,6-O-benzylidene-2,3-di-O-methanesulfonyl-α-D-glucopyranoside | 65530-21-4 | C16H22O10S2 | 438.477 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | Methyl 2-azido-2-deoxy-4,6-O-(phenylmethylene)-α-D-mannopyranoside | 116003-78-2 | C14H17N3O5 | 307.306 |
—— | methyl 2,3-diazido-4,6-O-benzylidene-2,3-dideoxy-α-D-mannopyranoside | 287719-31-7 | C14H16N6O4 | 332.319 |
—— | methyl 2-azido-4,6-O-benzylidene-2-deoxy-3-O-(trifluoromethanesulfonyl)-α-D-altropyranoside | 207506-27-2 | C15H16F3N3O7S | 439.369 |
—— | Methyl 3-S-acetyl-2-azido-4,6-O-benzyliden-2-desoxy-3-thio-α-D-mannopyranosid | 177929-99-6 | C16H19N3O5S | 365.41 |
—— | 2-Methyl-4,5-dihydro-(4,6-O-benzyliden-2,3-didesoxy-1-O-methyl-α-D-mannopyranoso)[2,3-d]-1,3-thiazol | 207506-30-7 | C16H19NO4S | 321.397 |
The title compounds were synthesized by the selective reduction of the azido group in 4-nitrophenyl 3,4,6-tri-
Methyl 4,6-O-benzylidene-α-D-glucopyranoside was converted into methyl 2-azido-2-deoxy-4,6-O-benzylidene-α-D-altropyranoside via a synthetic route that incorporated two inversions of configuration. Activation of the C-3 hydroxyl group as a triflate ester followed by an SN2 reaction with O-18 labeled benzoate gave, after standard functional group manipulations, 2-acetamido-2-deoxy-D-(3-18O)mannose. Coupling of the labeled N-acetyl-mannosamine with pyruvate was catalyzed by sialic acid aldolase to give ring-oxygen-labeled sialic acid in an overall yield of 11.4% over 10 steps.Key words: N-acetylneuraminic acid, sialic acid oxygen-18, chemoenzymatic.