Phosphine‐Catalyzed [3 + 2] and [2 + 4] Annulations of Γ‐Methyl Allenoates With Aryl Α‐Keto Esters: Stereoselective Syntheses of Functionalized Tetrahydrofurans and 4‐Chromanols

Asian Journal of Organic Chemistry - Germany
doi 10.1002/ajoc.201900635
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Wiley