N-(2,3,4-tri-O-acetyl-α-D-arabinopyranosyl)-N'-(3S-3-deoxy-1,2:5,6-di-O-isopropylidene-3-methoxycarbonyl-α-D-ribohexafuranos-3-yl)thiourea 以
四氢呋喃 为溶剂,
反应 2.0h,
以93%的产率得到(5S,6S,8R,9R,4'R)-6-(2',2'-dimethyl-1',3'-dioxolan-4'-yl)-8,9-(dimethylmethylenedioxy)-2-thioxo-3-(2'',3'',4''-tri-O-acetyl-β-D-arabinopyranosyl)-7-oxa-1,3-diazaspiro[4.4]nonan-4-one