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Anionic Chiral Co(III) Complexes Mediated Asymmetric Halocyclization-Synthesis of 5-Halomethyl Pyrazolines and Isoxazolines

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Enantioselective Halocyclization of Indole Derivatives: Using 1,3-Dihalohydantoins with Anionic Chiral Co(III) Complexes

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Summary: Highly enantioselective halocyclization reactions of indole derivatives, including tryptophols and tryptamines, have been achieved with anionic chiral Co(III) complexes and 1,3-dihalohydantoins (as little as 0.50 equiv). 3-Halo-fused indolines were obtained in excellent yields (up to 98%) and enantioselectivities (up to 98% ee), employing the chiral anion phase-transfer-catalysis strategy.

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