A Concise Construction of Polycyclic Quinolines via Annulation of ω-Cyano-1-alkynes with Diaryliodonium Salts
摘要:
A concise construction of polycyclic quinolines via intramolecular [2 + 2 + 2] annulation of omega-cyano-1-alkynes with diaryliodonium salts was realized. The process produced polycyclic quinolines in high yields with readily available staring materials and was tolerated with halogen substituents.
Metal-Free [2+2+2] Cycloaddition of Ynamides and Nitriles: Mild and Regioselective Synthesis of Fully Substituted Pyridines
作者:Yong Wang、Li-Juan Song、Xinhao Zhang、Jianwei Sun
DOI:10.1002/anie.201603889
日期:2016.8.8
A metal‐free trimolecular [2+2+2] cycloaddition of internal ynamides and nitriles for de novo synthesis of fully substituted pyridines is disclosed. With the versatile Brønsted acid catalyst HNTf2, the mild intermolecular cyclotrimerization process proceeds with complementary chemoselectivity and excellent regioselectivity.
Copper-Catalyzed [2+2+2] Modular Synthesis of Multisubstituted Pyridines: Alkenylation of Nitriles with Vinyliodonium Salts
作者:Jinyu Sheng、Yong Wang、Xiang Su、Ru He、Chao Chen
DOI:10.1002/anie.201700696
日期:2017.4.18
A [2+2+2] modular synthesis of multisubstituted pyridines, with excellent regioselectivity, has been realized by copper catalysisand involves three distinct components: vinyliodonium salts, nitriles, and alkynes. The reactions proceeded with the facile formation of an aza‐butadienylium intermediate by alkenylation of the nitrile with a vinyliodonium salt. Moreover, the alkynes in the reaction were