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200517.fm Page 187 Friday, March 18, 2005 2:52 PM
2005
Oxazine derivatives
R 0595
Magnesium Iodide Promoted Reactions of Nitrones with Cyclopropanes: A Synthesis of Tetrahydro-1,2-oxazines. — MgI 2 is found to be an effective catalyst for the
17- 168 dipolar
[3 + 2]cycloaddition of nitrones to cyclopropane diesters yielding 1,2-oxazine
derivatives. The nitrone derived from formaldehyde also undergoes successful reaction. This approach can also be performed in a three component sense by combining an
aldehyde, a hydroxylamine, and a cyclopropane. — (GANTON, M. D.; KERR*, M.
A.; J. Org. Chem. 69 (2004) 24, 8554-8557; Dep. Chem., Univ. West. Ont., London,
Ont. N6A 5B7, Can.; Eng.) — Jannicke
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