Journal
ORGANIC LETTERS
Volume 5, Issue 10, Pages 1709-1712Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol0343459
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beta-Ketoesters can be effectively monofluorinated with F-TEDA using CpTiCl3 as a catalyst. With the use of this catalyst, the extent of the competing difluorination does not reach 10%. [TiCl2(TADDOLato)] complexes catalyze the one-pot enantioselective heterodihalogenation of beta-ketoesters with F-TEDA and NCS to afford alpha-chloro-alpha-fluoro-beta-ketoesters in moderate to good yields. The sequence of addition of the halogenating agents determines the sense of chiral induction.
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