(5S,6S,8R,9R,4'R)-6-(2',2'-dimethyl-1',3'-dioxolan-4'-yl)-8,9-(dimethylmethylenedioxy)-3-(1'',3'',4'',6''-tetra-O-acetyl-2''-deoxy-β-D-glucopyranos-2''-yl)-2-thioxo-7-oxa-1,3-diazaspiro[4.4]nonan-4-one 在
sodium methylate 作用下,
以
甲醇 为溶剂,
反应 1.5h,
以56%的产率得到(5S,6S,8R,9R,4'R)-6-(2',2'-dimethyl-1',3'-dioxolan-4'-yl)-8,9-(dimethylmethylenedioxy)-3-β-D-glucopyranosyl-2-thioxo-7-oxa-1,3-diazaspiro[4.4]nonan-4-one