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Easy synthesis of heterocyclic carbene complexes by activation of chalcogenopyrones and benzopyrones to pyrylium salts and subsequent addition of carbanion of methoxy(methyl)pentacarbonyltungsten carbene complex |
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| Authors: | J-Y Le Bihan B Caro F Robin-Le Guen |
| Institution: | a I.U.T. Lannion, B.P. 30219, rue E. Branly, 22302 Lannion, France b Laboratoire de Chimie Thérapeutique EA 1043, Faculté des Sciences Pharmaceutiques et Biologiques de Lille, 3 rue du Professeur Laguesse, B.P. 83, 59006 Lille, France c U.M.R. Sciences Chimiques, CNRS 6226, I.U.T. Lannion, B.P. 30219, rue E. Branly, 22302 Lannion, France |
| Abstract: | Methylenechalcogenopyran and benzopyran Fischer carbene complexes are easily obtained from commercially available chalcogenopyrones or benzopyrones and carbanion of methoxy(methyl)carbene tungsten complex. The key of the heterocyclic carbene formation is the activation of the carbonyl group by alkylation with alkyl trifluoromethanesulfonate reagent. |
| Keywords: | Methylenechalcogenopyran and benzopyran carbene complexes Pyrylium salts Chalcogenopyrone and benzopyrone |
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