Hf(OTf)4-Catalyzed Regioselective N-Aminomethylation of Indoles and Related NH-Containing Heterocycles
摘要:
Under Lewis acidic conditions using Hf(OTf)(4), the aminomethylation of an indole derivative with a typical N,O-acetal preferentially produced kinetically favored N-aminomethylated indole derivatives instead of thermodynamically favored 3-aminomethylated indoles.
Under Lewis acidic conditions using Hf(OTf)(4), the aminomethylation of an indole derivative with a typical N,O-acetal preferentially produced kinetically favored N-aminomethylated indole derivatives instead of thermodynamically favored 3-aminomethylated indoles.
Stereoselective Synthesis of Polysubstituted Conjugated Dienes Enabled by Photo‐driven Sequential Sigmatropic Rearrangement
作者:Xin Ji、Chaoren Shen、Yuhao Ni、Zhi-Yao Si Si、Yuzhu Wang、Xinrong Zhi、Yuting Zhao、Huiling Peng、Lu Liu
DOI:10.1002/anie.202400805
日期:——
An unprecedented photo-driven quadruple sequential sigmatropic rearrangements of α-aryl α-diazo alkynylketones with aminals via 1,6-dipolar ion intermediate is disclosed. This protocol provides a facile access to synthetically useful multi-substituted conjugated dienes in highly stereoselective manner via visible light catalysis in mild conditions.