Selective radical cyclisation of propargyl bromoethers to tetrahydrofuran derivatives via electrogenerated nickel(I) tetramethylcyclam |
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Authors: | AP Esteves |
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Institution: | Centro de Química, Universidade do Minho, Largo do Paço, 4704-553 Braga, Portugal |
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Abstract: | The controlled-potential reduction of 1-bromo-2-methoxy-2-(prop-2′-ynyloxy)ethyl]benzene (1a), 1-2-bromo-2-phenyl-1-(prop-2′-ynyloxy)ethyl]-4-methoxybenzene (1b) and 2-bromo-3-(3′,4′-dimethoxyphenyl)-3-propargyloxypropanamide (1c) catalysed by (1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane)nickel(I), Ni(tmc)]+, at a vitreous carbon cathode in DMF/Et4NBF4 leads to 2-methoxy-4-methylene-3-phenyl-tetrahydrofuran (2a), 2-(4′-methoxyphenyl)-4-methylene-3-phenyl-tetrahydrofuran (2b) and 2-(3′,4′-dimethoxyphenyl)-3-carbamoyl-4-methylenetetrahydrofuran (2c), respectively, in very high yields. |
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Keywords: | Electrosynthesis Electrocatalytic reduction Intramolecular cyclisation Nickel(I) tetramethylcyclam |
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