N-<<1R-(1α,2β,3α,4β,5β)>-<1-hydroxymethyl-1,2,3,4-(tetrahydroxy)cyclopent-5-yl>aminothiocarbonyl>-2,3,6-tetra-O-benzyl-1,5-dideoxy-1,5-imino-D-glucitol 在
3-ethyl-2-chlorobenzoxazolium tetrafluoroborate 、
三乙胺 作用下,
以
乙腈 为溶剂,
反应 0.17h,
以95%的产率得到N-<<3aR-(3aα,4α,5β,6α,6aα)>-4-hydroxymethyl-3a,5,6,6a-tetrahydro-4,5,6-trihydroxy-4H-cyclopentoxazol-2-yl>-2,3,6-tetra-O-benzyl-1,5-dideoxy-1,5-imino-D-glucitol