The synthesis of derivatives of 2,4-diamino-2,4,6-trideoxy-d-gulo- and l-altro-hexopyranoses
摘要:
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-alpha-D-glucopyranoside. Derivative 29 was obtained from 3,4-di-O-acetyl-L-rhamnal in a 10-step reaction sequence.
The reactions of benzyl 4,6-O-benzylidene-2-benzyloxycarbonylamino-2-deoxy-3-O-mesyl-α-D-glucopyranoside (1), itsN-methylderivative (4) and 3-epimer (8) with sodium iodide in DMF were studied. Compound 1 gave several products including 2,3-alloepimine, 4 an oxazolidinone and 8 a 3-iodo derivative.