The synthesis of derivatives of 2,4-diamino-2,4,6-trideoxy-d-gulo- and l-altro-hexopyranoses

Syntheses of two derivatives of two 2,4-diamino-2,4,6-trideoxyhexoses having the d-gulo (16) and l-altro (29) configuration have been described. Derivative 16 was obtained by two routes starting from benzyl 2-benzyloxycarbonylamino-2-deoxy-α-d-glucopyranoside. Derivative 29 was obtained from 3,4-di-O-acetyl-l-rhamnal in a 10-step reaction sequence.