(1S)-2t,6t-bis-benzyloxycarbonylamino-4c-(2-benzyloxycarbonylamino-α-D-ribo-2,3-dideoxy-hexopyranosyloxy)-cyclohexane-1r,3t-diol 在
barium dihydroxide 、 sodium azide 、 barium(II) oxide 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
生成 (3a
R)-7
c-(6-azido-2-benzyloxycarbonylamino-α-
D-
ribo-2,3,6-trideoxy-hexopyranosyloxy)-6
t-benzyloxycarbonylamino-4
c-hydroxy-3-methyl-(3a
r,7a
c)-hexahydro-benzooxazol-2-one