Catalytic Asymmetric Synthesis of 2‐Alkyleneoxetanes through [2+2] Annulation of Allenoates with Trifluoromethyl Ketones

The first example of a β-isocupreidine (β-ICD)-catalyzed highly enantioselective [2+2] annulation of allenoates with trifluoromethyl ketones has been disclosed, allowing the synthesis of optically active 2-alkyleneoxetanes in moderate to good yields along with good to high enantioselectivities and high diastereoselectivities. Further transformations of the cycloadducts have been also disclosed to afford biologically interesting 6-trifluoromethyl-5,6-dihydropyran-2-ones and trifluoromethyl β-keto acids in good yields.

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