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2004
Benzopyran derivatives
R 0350
Rearrangements of N-Alkyl-/Aryl-nitrones Derived from 4-Oxo-4H-1-benzo— A Solvent-Dependent Process. — Nitrones (I) are pre45- 155 pyran-3-carboxaldehyde
pared as described previously and subjected to thermal rearrangement in different solvents. The products (II) and (III) are obtained selectively, depending on the polarity of
the solvent and on the temperature. The N-alkyl-substituted derivatives (IIIa)-(IIId) are
shown to be synthetic equivalents of 3-formyl-4-hydroxycoumarin by conversion into
the coumarino-isoxazoles (IV). — (GHOSH, T.; BANDYOPADHYAY*, C.;
Tetrahedron Lett. 45 (2004) 32, 6169-6172; Dep. Chem., Miss. Vivekananda Cent.
Coll., Calcutta 700 118, India; Eng.) — Roy
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