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DOI: 10.1055/a-2011-6969
A One-Pot Method to Prepare 4,5-Benzotropones and 2,3,4,5-Dibenzotropones
This work was supported by the National Natural Science Foundation of China (Grant No. 21871294).


Dedicated to Professor Guoqiang Lin on the occasion of his 80th birthday.
Abstract
An extremely simple method is developed to prepare 4,5-benzotropones and 2,3,4,5-dibenzotropones via one-pot cycloaddition reactions of alkynes with naphthoquinones and dibenzoquinones mediated by BF3·Et2O. Various mono- and disubstituted phenylacetylenes, multisubstituted 1,2-naphthoquinones and dibenzoquinone substrates are investigated. In addition, a scale-up synthesis of 7-phenyl-5H-dibenzo[a,c][7]annulen-5-one and further derivation of 7-(4-fluorophenyl)-5H-dibenzo[a,c][7]annulen-5-one are explored.
Key words
4,5-benzotropones - 2,3,4,5-dibenzotropones - BF3·Et2O-mediated reaction - dibenzoquinones - 1,2-naphthoquinonesSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/a-2011-6969.
- Supporting Information
Publication History
Received: 11 December 2022
Accepted after revision: 12 January 2023
Accepted Manuscript online:
12 January 2023
Article published online:
08 February 2023
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