Huynh, Vinh Ngoc and Leitner, Michael and Bhattacharyya, Aditya and Uhlstein, Lisa and Kreitmeier, Peter and Sakrausky, Patrick and Rehbein, Julia and Reiser, Oliver (2020) Diels-Alder reactions and electrophilic substitutions with atypical regioselectivity enable functionalization of terminal rings of anthracene. COMMUNICATIONS CHEMISTRY, 3 (1): 158. ISSN 2399-3669,
Full text not available from this repository. (Request a copy)Abstract
Reversing the regioselectivity of the renowned Diels-Alder reaction by overriding the usual thermodynamic and kinetic governing factors has always been a formidable challenge to synthetic organic chemists. Anthracenes are well-known to undergo [4 + 2]-cycloadditions with dienophiles at their 9,10-positions (central ring) over 1,4-positions (terminal ring) guided by the relative aromatic stabilization energy of the two possible products, and also by harboring the largest orbital coefficients of the highest occupied molecular orbital (HOMO) at the 9,10-positions. We, herein, report a 1,4-selective [4 + 2]-cycloaddition strategy of 9,10-unsubstituted anthracenes by installing electron-donating substituents on the terminal rings which is heretofore unprecedented to the best of our knowledge. The developed synthetic strategy does not require any premeditated engagement of the 9,10-positions either with any sterically bulky or electron-withdrawing substituents and allows delicate calibration of the regioselectivity by modulating the electron-donating strength of the substituents on the terminal rings. Likewise, the regioselective functionalization of the terminal anthracene ring in electrophilic substitution reactions is demonstrated. A mechanistic rationale is offered with the aid of detailed computational studies, and finally, synthetic applications are presented.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CATALYTIC-ACTIVITY; STEREOSELECTIVITY; BROMINATION; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Organische Chemie > Lehrstuhl Prof. Dr. Oliver Reiser |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 08 Mar 2021 09:46 |
| Last Modified: | 08 Mar 2021 09:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/43403 |
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