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2005
Multicomponent reactions
O 0359
Three Component Synthesis of Some γ-Spiroiminolactones under Microwave-Assisted Solvent-Free Conditions. — Microwave irradiation facilitates the
08- 063 three-component
condensation between idenoquinoxalinones (I), dialkyl acetylenedicarboxylates (II), and isocyanides (III). The reactions are completed within minutes and
afford the condensation products in high yields, in contrast to conventional heating in
benzene or DMF. The scope of the reaction is extended for the preparation of γ-spiroiminolactone derivatives (VII) and (IX) from benzylisatin (V) and tryptanthrine (VIII).
Irradiation of the educt mixture, adsorbed on solid support montmorillonite K-10, leads
to higher yields compared to the pure irradiation procedure. — (AZIZIAN*, J.;
KARIMI, A. R.; MOHAMMADI, A. A.; MOHAMMADIZADEH, M. R.; Heterocycles 63 (2004) 10, 2225-2229; Dep. Chem., Fac. Sci., Shahid Beheshti Univ.,
Tehran, Iran; Eng.) — H. Hoennerscheid
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