Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 78, Issue 8, Pages 3972-3979Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo400331b
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A new method for the preparation of highly functionalized beta-enamino diones has been developed. The protocol involves an initial self-catalyzed Mannich-type reaction of enolizable cyclic 1,3-dicarbonyls to nitrones, followed by a spontaneous intramolecular reorganization of the resulting nonisolated hydroxylamine to enamino derivatives. These compounds retain the features of unnatural a-amino acids. The ease of preparation makes them attractive intermediates for the synthesis of peptidomimetics, polyheterocycles, and other multifunctional compounds. All experimental results have been efficiently rationalized by in silico studies at the M06-2X level of theory, and a valid mechanistic pathway has been proposed.
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