Tetrahedron Letters p. 8219 - 8222 (1997)
Update date:2022-08-04
Topics:
Kawano, Tomikazu
Negoro, Kenji
Ueda, Ikuo
N-methyl-2-oxazolidinones (4) are obtained stereo- and regio-selectively when 3-ethoxy-6-(N-methyl-N-tert-butoxycarbonyl)amino-2,4-hexadienoates (1) are treated with concentrated sulfuric acid (1.0 equiv.) supported on silicagel in dichloromethane at 0 °C. 4 were shown to be intermediates for the construction of N-methylpyrrole ring. The structure and properties of 4 and related compounds are also described.
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