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2005
Oxazine derivatives
R 0595
Novel Salicylaldehyde-Based Mineral-Supported Expeditious Synthesis of Benz— The route to various potentially pharmaceutically useful benzoxa12- 169 oxazin-2-ones.
zines of type (IV) (18 examples) involves the cyclization of salicylaldehyde-based hydrazones (I) with ureas under solvent-free microwave irradiation in the presence of a
clay, followed by reductive dehydrazination under solvent-free microwave irradiation
of the resulting hydrazines (III). Compared to conventional heating of the compounds,
significantly shorter reaction times and almost 2-fold higher yields are obtained for
both steps. — (YADAV*, L. D. S.; KAPOOR, R.; J. Org. Chem. 69 (2004) 23,
8118-8120; Dep. Chem., Univ. Allahabad, Allahabad 211 002, India; Eng.) — Klein
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