Flash vacuum pyrolysis (FVP) of the oxazolidinylmethylene derivatives of Meldrum's acid 1 and 2 gives alkenylpyrroles 5 and 6 respectively, by a mechanism which involves collapse of a bicyclic intermediate 3; FVP of the related compound 9(which cannot undergo this process) gives the tricyclic compound 11; probably via an intramolecular Diels–Alder reaction.
通过双环中间体 3 崩溃的机理,梅尔德伦酸 1 和 2 的
噁唑烷基亚甲基衍
生物闪蒸真空热解(FVP)分别得到了烯基
吡咯 5 和 6;相关化合物 9(不能经历这一过程)的 FVP 得到了
三环化合物 11;可能是通过分子内 Diels-Alder 反应得到的。