Angewandte Chemie - International Edition p. 12206 - 12210 (2019)
Update date:2022-08-03
Topics:
Song, Chunlan
Dong, Xin
Wang, Zhongjie
Liu, Kun
Chiang, Chien-Wei
Lei, Aiwen
The [4+2] annulation represents an elegant and versatile synthetic protocol for the construction of benzene rings. Herein, a strategy for visible-light induced [4+2] annulation of thiophenes and alkynes, to afford benzene rings, is presented. Under simple and mild reaction conditions, the ready availability and structural diversity of thiophenes and alkynes permit the facile synthesis of several substituted aromatic rings. Valuable drugs and amino acids are also well tolerated. Moreover, DFT calculations explain the high regioselectivity of the reaction.
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