Oxindoles. New, general method of synthe
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Gassman, Paul G.; Van Bergen, T. J.
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Article
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1974
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American Chemical Society
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English
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and dried over anhydrous mtlgnesium sulfate. The drying agent was removed by filtration, and the solvent was evaporated to give 10.50 g (84% yield) of 61 as a light yellow oil: ir (neat) 3380 (enamine NH), 3050-2850 (CH), 1735 (ester C=O), 1670 (C==N), and 1615 (C==C) cm-l; pmr (CCI,) 2.80-3.50 (4 H