Selective one-pot synthesis of substituted pyrrole-3-phosphonates from α-cyanomethyl-β-ketoesters
作者:Ayhan S. Demir、Servet Tural
DOI:10.1016/j.tet.2007.02.097
日期:2007.5
α-cyanomethyl-β-ketophosphonates. The key step in the synthesis involves a one-pot addition and heteroannulation sequence. The zinc perchlorate-catalyzed addition of alcohols to the nitrile carbon of α-cyanomethyl-β-ketophosphonates followed by annulation furnished 5-alkoxypyrrole-3-phosphonates. The addition–annulation process is carried out in the presence of water and 4,5-dihydro-5-oxo-1H-pyrrole-3-phosphonates
摘要 本文介绍了一种从合适的 α-氰基甲基-β-酮膦酸盐开始一步合成 5-烷氧基吡咯-3-膦酸盐的方法。合成中的关键步骤涉及一锅添加和异环化序列。高氯酸锌催化醇加成到 α-氰基甲基-β-酮膦酸盐的腈碳上,然后环化提供 5-烷氧基吡咯-3-膦酸盐。加成环化过程在水存在下进行,4,5-二氢-5-氧代-1H-吡咯-3-膦酸盐(吡咯啉酮)的收率很高。