Nickel-Catalyzed [2+2+2] Cycloaddition of Alkyne-Nitriles with Alkynes Assisted by Lewis Acids: Efficient Synthesis of Fused Pyridines
作者:Xu You、Xin Xie、Gaonan Wang、Meijun Xiong、Renhong Sun、Haoyi Chen、Yuanhong Liu
DOI:10.1002/chem.201603829
日期:2016.11.14
A Ni/BPh3 catalyzed [2+2+2] cycloaddition of alkyne‐nitriles with alkynes has been developed, which provides an efficient route to fused pyridines under mild reaction conditions. Mechanistic studies indicate that an azanickelacycle via heterocoupling of an alkyne with a nitrile moiety is possibly formed as a key reaction intermediate. The Lewisacid catalyst is crucial to the successful transformation