(3 + 3) Annulation of acetoxy allenoates with enolisable carbonyl substrates leading to fused pyrans
Shubham Debnath, Sachin Chauhan, K. C. Kumara Swamy
Abstract
Lewis base-controlled (3 + 3) annulation of δ-acetoxy allenoates with N -Boc-oxindole, benzofuranone, or pyrazolone affords fused pyrans; the base DBU gives pyrans, while DMAP affords dihydropyrans.
Topics & Concepts
AnnulationOxindoleLewis acids and basesBase (topology)ChemistryPyrazoloneStereochemistryOrganic chemistryMathematicsCatalysisMathematical analysisSynthetic Organic Chemistry MethodsAsymmetric Synthesis and CatalysisCatalytic C–H Functionalization Methods