Organocatalytic Asymmetric Formal [4 + 2] Cycloaddition for the Synthesis of Spiro[4-cyclohexanone-1,3′-oxindoline] Derivatives in High Optical Purity
Organic Letters2010Vol. 12(5), pp. 1008–1011
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Abstract
A bifunctional organocatalytic asymmetric formal [4 + 2] cycloaddition reaction of Nazarov reagents and methyleneindolinones afforded spiro[4-cyclohexanone-1,3'-oxindoline] derivatives with excellent enantioselectivity (up to 98% ee).
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