silver cyanate 、
[(2R,3R,4R,5S)-3,4-dibenzoyloxy-5-bromo-5-carbamoyloxolan-2-yl]methyl benzoate 以
硝基甲烷 为溶剂,
生成 、 、 [(5S,7R,8R,9R)-8,9-dibenzoyloxy-2,4-dioxo-6-oxa-1,3-diazaspiro[4.4]nonan-7-yl]methyl benzoate 、 [(5R,7R,8R,9R)-8,9-dibenzoyloxy-2,4-dioxo-6-oxa-1,3-diazaspiro[4.4]nonan-7-yl]methyl benzoate