5-di-O-isopropylidene-beta-D-psicopyranose (1) is treated with acetic anhydride, chloroacetyl chloride, propanic anhydride and benzoyl chloride, the 3-O-benzoyl group undergoes an intramolecular replacement reaction with neighbouring group participation and transfer resulting in a more stable conjugated system by the formation of a 1,2,4-oxadiazol ring. A possible mechanism is reported. The structure has been determined
在一种新颖的方法中,当将3-O-苯甲酰基-3-C-(N-羟基
氨基甲酰基)-1,2:4,5-二-O-异亚丙基-β-D-psicopyranose(1)用
乙酸酐处理时,在
氯乙酰氯,
丙酸酐和
苯甲酰氯中,3-O-苯甲酰基会发生分子内置换反应,附近的基团会参与并转移,从而通过形成
1,2,4-恶二唑环形成更稳定的共轭体系。报告了一种可能的机制。该结构已经通过光谱数据和X射线晶体学分析确定。