Add time:08/18/2019         Source:sciencedirect.com

Unexpected reaction pathways have been unravelled that are involved in the generation of 2,2,5,5-substituted tetrahydrofurans from the mesylate of 5-hydroxy-5-methyl-6-oxo-2-phenyl-2-piperidinemethanol (7). Upon treatment of 7 with amines under controlled conditions two reactive intermediates could be isolated. The first is a strained aziridine-fused lactam, 1-azabicyclo[4.1.0]heptan-2-one 10, which reacts further with amines or methoxide at the lactam carbonyl group to form γ-hydroxyalkylaziridines. Final N-acylation results in internal OH attack to give the hydrofuran products. Reaction of 10 with some other nucleophiles led to 3,3,6,6-substituted 2-piperidinones.

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