The 1,3-dipolar cycloaddition to ethylene of N-glycosylnitrones, formed in situ from the partially protected d-mannose- or d-ribose-oximes and various glyoxalates, gave compounds which could be transformed into both enantiomers of 3-t-butoxycarbonyl-isoxazolidine and derivatives thereof.
由部分保护的d-
甘露糖或d-
核糖肟和各种
乙二醛原位形成的N-糖基硝酮在
乙烯上的1,3-偶极环加成反应生成的化合物可以转化为3-t-丁氧基羰基的两种对映异构体-异唑烷及其衍
生物。