carbene (NHC)-catalyzed umpolung of cyclopent-4-ene-1,3-diones that proceeds via the generation of nucleophilic deoxy-Breslow intermediates is presented. The carbene generated from a commercially available thiazolium salt catalyzed the cross-coupling between cyclopent-4-ene-1,3-diones and isatins to furnish the functionalized oxindoles in moderate to good yields with good functional group compatibility
介绍了 N-杂环卡宾 (NHC) 催化的 cyclopent-4-ene-1,3-diones 的 umpolung,其通过产生亲核脱氧-Breslow 中间体进行。由市售
噻唑鎓盐生成的卡宾催化 cyclopent-4-ene-1,3-diones 和
靛红之间的交叉偶联,以中等至良好的产率提供官能化的羟
吲哚,并具有良好的官能团相容性。通过 X 射线分析分离和表征了关键的脱氧-Breslow 中间体。还介绍了详细的机理研究。