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Wang, Hua; Zhou, Tongtong; Wu, Mengdi; Ye, Qingqing; He, Xinwei
Molecules (Basel, Switzerland), 05/2023, Volume: 28, Issue: 11Journal Article
A controllable synthesis of trisubstituted imidazoles and pyrroles has been developed through rhodium(II)-catalyzed regioselective annulation of -sulfonyl-1,2,3-trizaoles with -enaminones. The imidazole ring was formed through a 1,1-insertion of the N-H bond to α-imino rhodium carbene, followed by a subsequent intramolecular 1,4-conjugate addition. This occurred when the -carbon atom of the amino group was bearing a methyl group. Additionally, the pyrrole ring was constructed by utilizing a phenyl substituent and undergoing intramolecular nucleophilic addition. The mild conditions, good tolerance towards functional groups, gram-scale synthesis capability, and ability to undergo valuable transformations of the products qualify this unique protocol as an efficient tool for the synthesis of -heterocycles.
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