Meindl B, Pfennigbauer K, Stöger B, Heeney M, Glöcklhofer F. Double Ring-Closing Approach for the Synthesis of 2,3,6,7-Substituted Anthracene Derivatives.
J Org Chem 2020;
85:8240-8244. [PMID:
32447951 DOI:
10.1021/acs.joc.0c00826]
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Abstract
A method for the synthesis of 2,3,6,7-substituted anthracene derivatives, one of the most challenging anthracene substitution patterns to obtain, is presented. The method is exemplified by the preparation of 2,3,6,7-anthracenetetracarbonitrile and employs a newly developed, stable, protected 1,2,4,5-benzenetetracarbaldehyde as the precursor. The precursor can be obtained in two scalable synthetic steps from 2,5-dibromoterephthalaldehyde and is converted into the anthracene derivative by a double intermolecular Wittig reaction under very mild conditions, followed by a deprotection and intramolecular double ring-closing condensation reaction.
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