Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 17, Issue 38, Pages 8706-8710Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ob01830a
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Funding
- National Natural Science Foundation of China (NSFC) [21572047, 21772033]
- Plan for Scientific Innovation Talents of Henan Province [184200510012]
- Program for Innovative Research Team in Science and Technology in Universities of Henan Province [20IRTSTHN005]
- 111 Project [D17007]
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In this paper, a novel and sustainable synthesis of the hitherto unreported 5H-benzo[c]imidazo[1,2-a]azepine-6-carboxylic acids via the cascade reactions of 2-arylimidazoles (1) with methylene-oxetanones (2) is presented. Mechanistically, the formation of the title compounds is triggered by a Rh(iii)-catalyzed C(sp(2))-H alkenylation of 1 with 2 followed by an intramolecular N-nucleophilic substitution. With this method, a series of hybrid compounds combining the biologically promising imidazole and benzoazepine moieties decorated with a synthetically versatile carboxyl group were prepared in moderate to good efficiency. In addition, the utility of the products thus obtained was remarkably showcased by their efficient transformations into some otherwise difficult-to-obtain pentacyclic compounds.
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