TiCl4/t-BuNH2 as the sole catalyst for a hydroamination-based Fischer indole synthesis
作者:Lutz Ackermann、Robert Born
DOI:10.1016/j.tetlet.2004.10.160
日期:2004.12
A system comprising TiCl4 and t-BuNH2 acts as a catalyst for highly regioselective hydroamination reactions of alkynes using hydrazines and at the same time a Lewis acid in the transformation of the generated hydrazones into indole derivatives, while a 1,3-diyne is converted to pyrroles using the same precatalyst. (C) 2004 Elsevier Ltd. All rights reserved.
Aromatic Aza‐Claisen Rearrangement of Arylpropargylammonium Salts Generated in situ from Arynes and Tertiary Propargylamines
The charge‐accelerated aza‐Claisen rearrangement of ammonium salts serves as a key step in the construction of complex nitrogen‐containing molecules. However, much less attention has been paid to the aromatic aza‐Claisen rearrangement than to the aliphatic one. Herein, we report an unprecedented aromatic aza‐Claisen rearrangement of arylpropargylammonium salts, generated in situ from arynes and tertiary