Unexpected intramolecular cyclization of some 2′-aminochalcones to indolin-3-ones mediated by Amberlyst®-15
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Add time:09/04/2019 Source:sciencedirect.com
The intramolecular cyclization of 2′-aminochalcones derived from 2- and 4-pyridinecarboxaldehydes was carried out in the presence of Amberlyst®-15/AcOH media. Unexpectedly, the reaction proceeded through a 5-exo process turning into an alternative approach for the synthesis of 2-(pyridinylmethylene)indolin-3-ones.
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