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2004
Indole derivatives
R 0140
Synthesis of 5-Methylindole-4,7-quinone Through a New Construction of the
Indole Ring Based on the Allene-Mediated Electrocyclic Reaction
50- 073 Functionalized
Involving the Pyrrole[b]-Bond. — A new synthesis of the indole nucleus is based on
the electrocyclic reaction of the 2-alkenyl-allenylpyrroles (II). The resulting product
(IIIa) is further elaborated to the quinone (IV). However, the structure of the natural
product isolated from Dropella fragum together with the antimicrobial analogues (V)
is not identical with (IV). — (HIRAYAMA, M.; CHOSHI, T.; KUMEMURA, T.;
TOHYAMA, S.; NOBUHIRO, J.; HIBINO*, S.; Heterocycles 63 (2004) 8,
1765-1770; Fac. Pharm. Pharm. Sci., Grad. Sch. Pharm. Pharm. Sci., Fukuyama Univ.,
Fukuyama, Hiroshima 729-02, Japan; Eng.) — Mais
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