Synthesis 2020; 52(24): 3865-3873
DOI: 10.1055/s-0040-1707863
special topic
© Georg Thieme Verlag Stuttgart · New York

Iridium(III)-Catalyzed Difluoroalkylation–Bicyclization of 1,7-Enynes toward Benzo[a]fluoren-5-ones under Visible-Light Photoredox Conditions

Min-Hua Huang
a   School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P. R. of China
b   Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 210009, Jiangsu, P. R. of China   eMail: jiangchem@jsnu.edu.cn
,
Wen-Juan Hao
a   School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P. R. of China
,
Bo Jiang
a   School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P. R. of China
› Institutsangaben
We are grateful for financial support from the National Natural Science Foundation of China (NSFC) (Grant No. 21971090).
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Publikationsverlauf

Received: 05. April 2020

Accepted after revision: 07. Mai 2020

Publikationsdatum:
16. Juni 2020 (online)


Published as part of the Special Topic Recent Advances in Metal-Catalyzed Ring Construction

Abstract

A new visible-light-induced Ir(III)-catalyzed difluoroalkylation–bicyclization of 1,7-enynes with ethyl 2-bromo-2,2-difluoroacetate (BrCF2CO2Et) is described, furnishing a wide range of difluoromethyl-containing benzo[a]fluoren-5-ones in good to excellent yields. The reaction is operationally simple, proceeds with high efficiency under mild conditions, and shows excellent functional group compatibility.

Supporting Information