Synthesis 2010(23): 4033-4042  
DOI: 10.1055/s-0030-1258284
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York

Synthesis of Nonsymmetrical 5-Aryl-2-indolopyrrole Derivatives via Controlled Mono Suzuki-Miyaura Cross-Coupling on N-Boc-2,5-dibromopyrrole

Floriane Beaumard, Philippe Dauban, Robert H. Dodd*
Institut de Chimie des Substances Naturelles, UPR 2301, Campus de Recherche de Gif, Centre National de la Recherche Scientifique, Avenue de la Terrasse, 91198 Gif-sur-Yvette, France
Fax: +33(1)69077247; e-Mail: robert.dodd@icsn.cnrs-gif.fr;
Further Information

Publication History

Received 3 August 2010
Publication Date:
05 October 2010 (online)

Abstract

The first example of mono Suzuki-Miyaura cross-coupling of N-Boc-2,5-dibromopyrrole with a boronic acid (indol-2-ylboronic acid) is reported. The resulting 2-indolyl-5-bromopyrrole derivative was in turn coupled with a variety of aryl- or heteroarylboronic acids thereby providing the corresponding non-symmetrical 2,5-disubstituted pyrroles in good to excellent yields. The tert-butoxycarbonyl (Boc) groups could be easily removed to give the completely deprotected products.

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21

Langer demonstrated that use of palladium(II) diacetate together with the phosphine ligand, SPhos increased the yield of mono-coupled product with dibromothiophene by 20% (see reference 15b). Application of these same reaction conditions to substrate 3 led mainly to degradation products.