A formal [3 + 3] cycloaddition of allenyl imide and activated ketones for the synthesis of tetrasubstituted 2-pyrones.
RSC Adv
; 11(15): 8867-8870, 2021 Feb 23.
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| MEDLINE
| ID: mdl-35423364
ABSTRACT
CsOH·H2O-catalyzed formal [3 + 3] cycloadditions of allenyl imide with ß-ketoesters, 1,3-diketones or ß-ketonitriles for the synthesis of tetrasubstituted 2-pyrone derivatives have been demonstrated. The allenyl imide was utilized as a C3-synthon, and a ketenyl intermediate was proposed via the process of 1,4-addition of carbon anion to allene followed by elimination of the 2-oxazolidinyl group.
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