Regioselective Formation of Substituted Indoles: Formal Synthesis of Lysergic Acid
作者:Gary L. Points、Kenneth T. Stout、Christopher M. Beaudry
DOI:10.1002/chem.202004107
日期:2020.12.15
for the synthesis of indoles and related heterocycles is reported. An intramolecular cycloaddition of alkyne‐tethered 3‐aminopyrones gives 4‐substituted indolines in good yield and with complete regioselectivity. Additional substitution is readily tolerated in the transformation, allowing synthesis of complex and non‐canonical substitution patterns. Oxidative conditions give the corresponding indoles
据报道,基于狄尔斯-阿尔德反应的吲哚和相关杂环的合成策略。分子内链状连接的3-氨基吡喃酮的环加成反应可得到4-取代的二氢吲哚,收率高,具有完全的区域选择性。转换中很容易容忍其他替换,从而可以合成复杂和非规范的替换模式。氧化条件产生相应的吲哚。该策略还可以合成咔唑。麦角酸的正式合成中展示了该方法。