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2005
Benzofuran derivatives
R 0070
A First Regioselective Synthesis of 3-Fluoroalkylated Benzofurans via PalladiumAnnulation of Fluorine-Containing Internal Alkynes with Variously
14- 112 -Catalyzed
Substituted 2-Iodophenol. — The title reaction affords benzofurans (III) as single
regioisomers in good to high yields. Some limitations of this method are observed. No
or poor yields of the desired benzofurans are obtained from reactions of alkynes bearing
a para-nitro or an ortho-chloro substituent at the phenyl ring, or an alkyl chain instead
of the aromatic ring. Nitro or nitrile substituents at the 4-position of the phenol also lead
to poor yields. — (KONNO*, T.; CHAE, J.; ISHIHARA, T.; YAMANAKA, H.;
Tetrahedron 60 (2004) 51, 11695-11700; Dep. Chem., Kyoto Inst. Technol., Sakyo,
Kyoto 606, Japan; Eng.) — Klein
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