Expeditious entry to novel 2-methylene-2,3-dihydrofuro[3,2-c] chromen-2-ones from 6-chloro-4-hydroxychromen-2-one and propargylic alcohols |
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| Authors: | Nebra Noel Díaz-Álvarez Alba E Díez Josefina Cadierno Victorio |
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| Institution: | Departamento de Química Orgánica e Inorgánica, IUQOEM-CSIC, Facultad de Química, Universidad de Oviedo, E-33071 Oviedo, Spain. |
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| Abstract: | A catalytic system consisting of the ruthenium(II) complex Ru(η3-2-C3H4Me)(CO)(dppf)]SbF6] (dppf=1,1'-bis(diphenylphosphino)ferrocene) and trifluoroacetic acid has been used to promote the coupling of secondary propargylic alcohols with 6-chloro-4-hydroxychromen-2-one. The reactions afforded unusual 2-methylene-2,3-dihydrofuro3,2-c]chromen-2-ones in good yields. |
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