Two types of rare five‐membered aza‐heterocycles, namely 3,3‐disubstituted‐3H‐pyrroles and 5‐hydroxypyrrolines, were synthesized from calcium carbide and available sec‐alkyl (het)aryl ketoximes in the MOH/DMSO (M=Na, K) superbase systems. In contrast to the known procedures implemented with acetylene gas, the modified method is expedient and much safer that makes these intriguing aza‐heterocycles accessible for any laboratory without facilities working with acetylene gas.

中文翻译：

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乙氧嘧啶和3H-吡咯的级联反应中碳化钙作为乙炔源

在MOH / DMSO中由电石和可用的仲烷基（杂）芳基酮肟合成了两种稀有的五元氮杂杂环，即3,3-二取代-3 H-吡咯和5-羟基吡咯啉（M = Na，K）超级数据库系统。与用乙炔气实施的已知程序相比，改进的方法方便且安全得多，这使这些引人入胜的氮杂杂环可在没有使用乙炔气的设施的任何实验室使用。