Metal-free cycloisomerizations of o-alkynylbiaryls†,Chemical Communications

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Metal-free cycloisomerizations of o-alkynylbiaryls†
Chemical Communications ( IF 4.3 ) Pub Date : 2018-10-11 00:00:00 , DOI: 10.1039/c8cc05484c
Jingyi Zhang _{1,

2,

3} , Siqi Li _{1,

2,

3} , Yan Qiao _{2,

3,

4} , Cheng Peng _{1,

2,

3} , Xiao-Na Wang _{1,

2,

3} , Junbiao Chang _{1,

2,

3}

Affiliation

We describe a novel and highly efficient metal-free strategy to construct 9,9-disubstituted fluorenes and phenanthrenes via the TfOH-catalyzed cycloisomerizations of o-alkynylbiaryls. Notably, the significant effects of the electronic properties and steric hindrance of the alkyne terminus on the reaction selectivity have been observed.

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