New approaches to polysubstituted pyrroles and pyrrolinones from α-cyanomethyl-β-ketoesters
作者:Ayhan S. Demir、Mustafa Emrullahoglu、Gülben Ardahan
DOI:10.1016/j.tet.2006.10.054
日期:2007.1
efficient, regioselective one-pot synthesis of 5-alkoxy and 5-alkylsulfanylpyrrole-3-carboxylates in high yields via the zinc perchlorate-catalyzed addition of alcohols and thiols to the nitrile carbon of α-cyanomethyl-β-ketoesters followed by annulation. The addition–annulation process is undertaken in aqueous solution to give 4,5-dihydro-5-oxo-1H-pyrrole-3-carboxylates (pyrrolinones) in good yields. These
在本文中,我们报告了通过高氯酸锌催化的醇和硫醇向α-氰基甲基-甲基腈碳的加成反应,高产率高效,区域选择性地合成5-烷氧基和5-烷基硫烷基吡咯-3-羧酸酯的方法。 β-酮酸酯,然后进行环空。加成环过程在水溶液中进行,以高收率得到4,5-二氢-5-氧代-1 H-吡咯-3-羧酸盐(吡咯啉酮)。这些4,5-二氢-5-氧基-1 H-吡咯-3-羧酸酯也可通过5-烷氧基吡咯-3-羧酸酯的水解而获得。