Selective construction of alkaloid scaffolds by alcohol-based direct and mild aerobic oxidative Pictet–Spengler reactions
作者:Haicheng Liu、Feng Han、Huan Li、Jianping Liu、Qing Xu
DOI:10.1039/d0ob01549k
日期:——
Employing TBN/TEMPO as the catalysts and oxygen as the oxidant, the biologically and pharmaceutically significant tetrahydro-β-carboline and β-carboline alkaloid scaffolds that used to be obtained by multi-step processes can now be selectively obtained in only one-step via direct aerobic oxidative Pictet–Spengler reactions of tryptamines with alcohols under mild conditions, with water generated as
采用TBN/TEMPO作为催化剂,氧气作为氧化剂,以前通过多步工艺获得的具有生物学和药学意义的四氢-β-咔啉和β-咔啉生物碱支架现在可以通过一步选择性获得在温和的条件下,色胺与醇的直接需氧氧化 Pictet-Spengler 反应,生成水作为副产物。在该反应中,有趣地发现 TBN/TEMPO 能够促进整个反应的环化步骤。这种方法可以容忍多种C - 和N-取代的色胺,以及反应性更强的苄醇和烯丙醇以及反应性较低的脂肪醇。该方法还可以扩展到二氢-β-咔啉的合成,并应用于更容易获得和更经济的色氨酸合成β-咔啉,揭示了其广泛的底物范围和合成应用潜力。