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2004
Fused pyridine derivatives
R 0450
Concomitant Ring Contraction Cyclization Strategy for the Synthesis of Novel
— A synthetic pathway to the title com44- 168 4-Oxo-4,5-dihydro-pyrroloquinolines.
pounds (VII) from aminophenylthiazines (VI) involves a KOtBu-initiated ring contraction. The strategy is based on the easy access to enamines of type (IV) which undergo
hetero-Diels—Alder reaction with DMAD (V). Furthermore, a synthesis of
4-thiono-1,3-quinazolines (X) is discussed. — (MANH, G. T.; BAKKALI, H.;
MAINGOT, L.; PIPELIER, M.; JOSHI, U.; PRADERE, J. P.; SABELLE, S.; TULOUP,
R.; DUBREUIL*, D.; Tetrahedron Lett. 45 (2004) 30, 5913-5916; Lab. Synth. Org.,
CNRS, Fac. Sci. Tech., Univ. Nantes, F-44072 Nantes, Fr.; Eng.) — Mais
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