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2005
Benzofuran derivatives
R 0070
Benzannulation of Heterocyclic Ring Systems Through Coupling of Fischer CarComplexes and Heterocycle-Bridged Enynes. — Five-membered heterocyclic
29- 117 bene
enynes react with Fischer carbene complexes to yield heterocyclic fused benzofurans
after treatment with catalytic amounts of sulfuric acid. The reaction is also investigated
in competition with known chromium carbene-alkyne coupling processes providing the
benzannulation products (V) and (XV) exclusively. — (ZHANG, Y.; CANDELARIA,
D.; HERNDON*, J. W.; Tetrahedron Lett. 46 (2005) 13, 2211-2214; Dep. Chem.
Biochem., N. Mex. State Univ., Las Cruces, NM 88003, USA; Eng.) — Mais
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