1,3-Dipolar cycloadditions of 2-deoxy-D-ribose-derived L-threo five-membered cyclic nitrone to α,β-unsaturated γ- and δ-lactones were investigated. Cycloadducts obtained from δ-lactones, after NO bond cleavage, opening of the lactone ring, and protection of hydroxyl groups were subjected to β-lactam ring formation by using Mukaiyama's salt. Cycloadducts from γ-lactones subjected to the same reaction
研究了
2-脱氧-D-核糖衍生的L-苏式五元环硝酮与α,β-不饱和γ-和δ-内酯的1,3-偶极环加成反应。通过使用Mukaiyama盐使从δ-内酯获得的大
环氧化物在NO键断裂,内酯环的打开和羟基的保护之后经历β-内酰胺环的形成。经历相同反应顺序的γ-内酯的负载物经历
水分子的β-消除,以提供
吡咯烷取代的不饱和γ-内酯。