The ring expansion of 2-ester-2-arylazetidine carbamates can be achieved using Brønsted acids to form 6,6-disubstituted 1,3-oxazinan-2-ones. The reaction is rapid at room temperature with Boc or Cbz derivatives and proceeds with excellent yield (up to 96%) and broad substrate scope. Derivatives of drug compounds and natural products are incorporated. The combination of this ring expansion in a three-step
使用布朗斯台德酸形成6,6-二取代的1,3-恶二嗪-2-酮可实现2-酯-2-芳基氮杂
环丁烷氨基甲酸酯的扩环。该反应在室温下与Boc或Cbz衍
生物反应迅速,并以优异的收率(最高96%)和广泛的底物范围进行。掺入了药物化合物和
天然产物的衍
生物。通过三步的NH插入/环化/扩展顺序,将这种环扩展结合起来,可直接从无环前体中获得与医学相关的支架。