Title cpd is prepd. from Kanamycine A by (a) acylating with 1 mole N-(benzyloxycarbonyloxy) succinimide; (b) Schiff base formation with pivalaldehyde, benzaldehyde or 4-nitro or 4-methoxybenaldehyde at reflux; (c) condensation with =1 mol. L-(-)-gamma-benzyloxycarbonylamino-alpha-hydroxybutanoic acid N-hydroxysuccinimide ester; and (d) reducing with H2/catalyst, pref. in aq. dioxan (1:1) contg. AcOH.
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