P(NMe2)3-Mediated Umpolung (3 + 2) Annulation of β,γ-Unsaturated α-Keto Carbonyls with p-Quinone Methides: Synthesis of Spirocyclopentenyl p-Dienones
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A novel umpolung (3 + 2) annulation reaction between β,γ-unsaturated α-keto carbonyls and p-quinone methides mediated by P(NMe2)3 is described, providing a stereoselective approach to the construction of synthetically interesting, densely functionalized spi... ...
