Abstract
Copper(I) complexes prepared in situ from chiral bisoxazolines and Cu(I)OTf have been studied as catalysts for the allylic oxidation of cycloalkenes. Using 5 mol% of catalyst and tertbutyl perbenzoate as oxidant, optically active 2-cycloalkenyl benzoates were obtained in moderate to good yields. The highest enantiomeric excesses, 74% at 23 °C and up to 84% at lower temperatures, were observed for cyclopentene and cycloheptene, while cyclohexene gave somewhat lower selectivities ranging between 64–77%ee.
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