Herein, a synthesis of 2-phosphonodihydrofurans and 2-phosphonodihydropyrroles via 5-endo cyclization of O-and N-propargylated compounds is described. The reaction is promoted by potassium tert-butoxide and allows a fast access to interesting heterocycles which were easily converted into 2-arylated pyrroles under acidic conditions.

中文翻译：

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通过碱促进的5-内环化反应合成2-膦杂环

此处，2- phosphonodihydrofurans和2- phosphonodihydropyrroles合成通过5-内的O形环化Ñ -propargylated描述的化合物。该反应由叔丁醇钾促进，并允许快速进入有趣的杂环，这些杂环在酸性条件下容易转化为2-芳基吡咯。