| 摘要 |
NEW MATERIAL:A compound shown by the formula I [R<1> is H, or acetyl; R<2> is H, methyl, benzyl, or group shown by the formula II (Bzl is benzyl); R<3> is H, or R<2> and R<3> together with C and N bonded to them form group shown by the formula III]. EXAMPLE:Methyl( methyl-5-( N-benzyloxycarbonylglycylamino )-3,5-dideoxy-beta-D- glycero-D-galacto-2-neuropyronoside)onate. USE:An immunomodulator. PREPARATION:For example, an N-benzyloxycarbonylamino acid derivative shown by the formula IV is reacted with an neuraminic acid derivative shown by the formula V in the presence of a condensation agent such as dicyclohyxylcarbodiimide, etc. in anhydrous pyridine or dimethylformamide to give a compound shown by the formula I.
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