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Fluorination: A wide range of nitroolefins and pyrazol-5-ones undergo a sequential 1,4-addition/dearomative-fluorination transformation when treated with a catalytic amount of a tertiary-amine-thiourea compound and the terminal electrophile, N-fluorobenzenesulfonimide, to give fluorinated products in 72-95% yield with up to 99:1 d.r. and 98% ee. Notably, these products contain adjacent tertiary and α-fluoro quaternary stereocenters (see scheme).

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