Photoredox Annulation of Polycyclic Aromatic Hydrocarbons.
JACS Au
; 3(11): 3045-3054, 2023 Nov 27.
Article
in En
| MEDLINE
| ID: mdl-38034957
ABSTRACT
The rise of interest in using polycyclic aromatic hydrocarbons (PAHs) and molecular graphenoids in optoelectronics has recently stimulated the growth of modern synthetic methodologies giving access to intramolecular aryl-aryl couplings. Here, we show that a radical-based annulation protocol allows expansion of the planarization approaches to prepare functionalized molecular graphenoids. The enabler of this reaction is peri-xanthenoxanthene, the photocatalyst which undergoes photoinduced single electron transfer with an ortho-oligoarylenyl precursor bearing electron-withdrawing and nucleofuge groups. Dissociative electron transfer enables the formation of persistent aryl radical intermediates, the latter undergoing intramolecular C-C bond formation, allowing the planarization reaction to occur. The reaction conditions are mild and compatible with various electron-withdrawing and -donating substituents on the aryl rings as well as heterocycles and PAHs. The method could be applied to induce double annulation reactions, allowing the synthesis of π-extended scaffolds with different edge peripheries.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
JACS Au
Year:
2023
Document type:
Article
Affiliation country:
Austria