Abstract
AbstractA C1‐symmetric amino sulfoximine has been used as a chiral ligand in copper‐catalyzed asymmetric halogenation reactions of β‐oxo esters. Both the catalyst itself and the reaction conditions were optimized, and 26 fluorinated, chlorinated, and brominated products were obtained with enantioselectivities of up to 91 % ee in yields of up to 99 %. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
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