在脱丁基锂的存在下,从 β-alcoxyvinyi trifluoromethyl cetones deformule generale ROCH=CHCOCF 3 (1; R = Et, Me 2 CHCH 2 ) et de leurs 类似物 cycliques, tels le 4-trifluoroacetyl-2,3-dihydrofurane 的反应(2a) et le 5-trifluoroacetyl-3,4-dihydro-2H-pyrane (2b) avec des alcynes vrais deformule generale RC≡CH (3; R = Ph, PhCH 2 , HOCH 2 , C 5 H 11 ) principalement a des produits d'additions 1,2 (alcynylation du carbonyle)。Toutefois,lorsque
Synthesis of αβ-Unsaturated Trifluoromethyl Ketones from 4-Dimethylamino-1,1,1-trifluorobut-3-ene-2-one by Addition of Grignard Reagents
作者:Rebecca J. Andrew、John M. Mellor
DOI:10.1016/s0040-4020(00)00597-4
日期:2000.9
such as dimethylamine and they react with Grignard reagents to give αβ-unsaturated trifluoromethyl ketones in good yield by 1,4-addition followed by elimination. The generality of this procedure is contrasted with reactions based either on the use of organolithium nucleophiles, or the use of 4-alkoxy-αβ-unsaturated trifluoromethyl ketones as electrophilic partners.
The convenientsynthesis of ten halo- and an isoxazole-containing acetylenes from the reaction of acetylenes with n-butyl lithium and subsequent reaction with an electrophile agent (ethyl trichloroacetate, ethyl dichloroacetate, trifluoroacetic anhydride, 3-methylisoxazol-5-carbonyl chloride, carbon tetrachloride and 1,1,1-trifluoro-4-ethoxy-3-buten-2-one) in moderated to good yields is reported. The
Asymmetric synthesis of either diastereomer of trifluoromethylated allylic amines by the selective reduction of trifluoromethyl α,β-unsaturated N-tert-butanesulfinyl ketoimines
作者:Zhen-Jiang Liu、Jin-Tao Liu
DOI:10.1039/b810459j
日期:——
Regio- and diastereoselective reduction of chiraltrifluoromethyl α,β-unsaturated N-tert-butanesulfinyl ketoimines 1 was achieved by choosing appropriate reducing agent and either diastereomer of the corresponding trifluoromethylated allylic amines was obtained with good yield and excellent diastereoselectivity (up to >99 : 1 dr).