3-N-allyl-3-amino-3-C-cyano-3-deoxy-1,2:5,6-di-O-isopropylidene-3-N-methanesulfonyl-α-D-allofuranose 在
caesium carbonate 作用下,
以
乙腈 为溶剂,
反应 6.0h,
以66%的产率得到1,2:5,6-di-O-isopropylidene-α-D-ribo-hexofuranose-3-spiro-3'-(2'-N-allyl-4'-amino-5'H-2',3'-dihydroisothiazole-1',1'-dioxide)