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