Regiodivergent Synthesis of 4,5'- and 4,4'-Imidazolinyl Spiropyrazolones from 4-Alkylidene Pyrazolones and Amidines.
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DOI: 10.1021/acs.orglett.1c01475
Abstract: The solvent-free reaction of 4-alkylidene pyrazolones with amidines can furnish 4,5'-imidazolinyl spiropyrazolones in good to excellent yields when promoted by N-iodosuccinimide under solvent-free ball-milling conditions, whereas it almost exclusively affords 4,4'-imidazolinyl spiropyrazolones if mediated by… read more here.
Keywords: imidazolinyl; regiodivergent synthesis; pyrazolones amidines; alkylidene pyrazolones ... See more keywords