Coupling-Isomerization-Stetter and Coupling-Isomerization-Stetter-Paal-Knorr Sequences - A Multicomponent Approach to Furans and Pyrroles

Roland U. Braun; Thomas J. J. Müller

doi:10.1055/s-2004-831192

FEATUREARTICLE

Coupling-Isomerization-Stetter and Coupling-Isomerization-Stetter-Paal-Knorr Sequences - A Multicomponent Approach to Furans and Pyrroles

Roland U. Braun, Thomas J. J. Müller*
Organisch-Chemisches Institut , Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
Fax: +49(6221)546579; e-Mail: Thomas_J.J.Mueller@urz.uni-heidelberg.de ;

Abstract

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Abstract

2,3,5-Trisubstituted furans 6 and 1,2,3,5-tetrasubstituted pyrroles 8 can be synthesized in good yields in a one-pot three-step three- or four-component process by a coupling-isomerization-Stetter-Paal-Knorr sequence of an electron-poor (hetero)aryl halide 1, a terminal propargyl alcohol 2, an aldehyde 3, and, in the case of pyrroles, a primary amine 7. All novel furans and pyrroles exhibit a strong blue fluorescence with considerable Stokes shifts.

Key words

catalysis - cross-couplings - diketones - furans - pyrroles

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Referenzen

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