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2004
Thiophene derivatives
R 0090
Synthesis of 5,5'-Diarylated 2,2'-Bithiophenes via Palladium-Catalyzed Arylation
— Symmetrical biarylated bithiophenes (III) are efficiently prepared by
47- 108 Reactions.
arylation of bithiophenes (I) with aryl bromides in the presence of Pd(OAc)2 and bulky
phosphine ligand PHO via C—H bond cleavage. Unsymmetrical bithiophenes like
(VII) and (IX) are prepared by selective monoarylation of methanol derivative (IV) via
C—C bond cleavage employing PCy3 as ligand and o-xylene as solvent, followed by a
second arylation of the resulting products via C—H bond cleavage. — (YOKOOJI,
A.; SATOH, T.; MIURA*, M.; NOMURA, M.; Tetrahedron 60 (2004) 32, 6757-6763;
Dep. Appl. Chem., Fac. Eng., Osaka Univ., Suita, Osaka 565, Japan; Eng.) — Klein
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