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.
Mueller,A.K. et al., Justus Liebigs Annalen der Chemie, 1976, p. 400 - 406
作者:Mueller,A.K. et al.
DOI:——
日期:——
MIZAFFAR, ANJUM;BROSSI, ARNOLD;HAMEL, ERNEST, J. NATUR. PROD., 53,(1990) N, C. 1021-1024