1-[[(3'aR,6'R,6'aR)-2,2,2',2'-tetramethylspiro[1,3-dioxolane-4,4'-6,6a-dihydro-3aH-furo[3,4-d][1,3]dioxole]-6'-yl]methoxy]-3-[(4-methoxyphenyl)methyl]urea 在
三氟甲磺酸三甲基硅酯 作用下,
以
乙腈 为溶剂,
以97%的产率得到(1R,2R,6R,7R)-7-(hydroxymethyl)-N-[(4-methoxyphenyl)methyl]-4,4-dimethyl-3,5,9,11-tetraoxa-8-azatricyclo[5.3.1.02,6]undecane-8-carboxamide