Journal
SYNLETT
Volume 33, Issue 15, Pages 1505-1510Publisher
GEORG THIEME VERLAG KG
DOI: 10.1055/a-1875-2646
Keywords
nitrobenzenes; formylchromones; nitromethane; Michael addition; Nef reaction; cascade reaction
Categories
Funding
- FEDER [POCI-01-0145-FEDER-029767, UIDB/50006/2020, UIDB/50011/2020, UIDP/50011/2020]
- FCT/MCTES
- EpigenGlicON project [POCI-01-0145-FEDER029767]
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A mild synthesis of 3,5-disubstituted nitrobenzenes from readily available 3-formylchromones is reported. The developed methodology involves a cascade process catalyzed by 1,8-diazabicyclo[5.4.0]undec-7-ene. The proposed mechanism includes Michael addition reactions and intramolecular cyclization, leading to the formation of three new C-C bonds. The method offers a straightforward and gram-scale synthesis of 3,5-disubstituted nitrobenzenes.
A mild synthesis of 3,5-disubstituted nitrobenzenes from readily available 3-formylchromones is reported. The developed methodology follows a cascade process, promoted by 1,8-diazabicyclo[5.4.0]undec-7-ene. The proposed mechanism involves an initial Michael addition of nitromethane at C-2 of a 3-formylchromone. The resultant intermediate undergoes another Michael reaction with a second 3-formylchromone molecule. After ring closure through intramolecular cyclization, the aromatization is completed by deformylation, affording the 3,5-disubstituted nitrobenzenes in 52-86% yield. The reported method produces three new C-C bonds in a simple and straightforward manner, and it is consistent with gram-scale synthesis.
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