Structure-activity studies of fluoroaljyl-substituted γ-butyrolactone and γ-thiobutyrolactone modulators of GABAA receptor function
作者:Daniel J. Canney、Hwang-Fun Lu、Ann C. McKeon、Kong-Woo Yoon、Kun Xu、Katherine D. Holland、Steven M. Rothman、James A. Ferrendelli、Douglas F. Covey
DOI:10.1016/s0968-0896(97)10006-2
日期:1998.1
Dihydro-2(3H)-furanones (gamma-butyrolactones) and dihydro-2(3H)-thiophenones (gamma-thiobutyrolactones) containing fluoroalkyl groups at positions C-3, C-4, and C-5 of the heterocyclic rings were prepared. The anticonvulsant/convulsant activities of the compounds were evaluated in mice. Brain concentrations of the compounds were determined and the effects of the compounds on [35S]-tert-butylbicyclophosphorothionate
ASYMMETRICAL REDUCTION OF PERFLUOROALKYLATED KETONES, KETOESTERS AND VINYL COMPOUNDS WITH BAKER’S YEAST
作者:Tomoya Kitazume、Nobuo Ishikawa
DOI:10.1246/cl.1983.237
日期:1983.2.5
Reduction of perfluoroalkylated ketones, ketoesters and vinyl compounds with baker’s yeast was studied. The ketones and β-ketoesters were asymmetrically reduced to give optically active perfluoroalkylated carbinols and hydroxyesters, while the vinyl compounds were reduced to perfluoroalkylated alkanes.
overall yield isreported starting from 1,1,1-trifluoroacetone. The electrophilic reactivity of this compoundtowards various nucleophiles has been studied. Thus, for example, condensation withthe sodium salt of diethylmalonate gave ethyl 2-carboethoxy-5-trifluoromethylhex-4-enoate in 66% yield.
Trifluoromethyl group induced highly stereoselective synthesis of α-hydroxy carbonyl compounds
作者:Yoshitomi Morizawa、Arata Yasuda、Keiichi Uchida
DOI:10.1016/s0040-4039(00)84388-9
日期:1986.1
The reaction of enolate prepared from ethyl 3-methyl-4,4,4-tri-fluorobutyrate with MoO5-Py-HMPA complex provides ethyl (2S★,3S★)-2-hydroxy-3-methyl-4,4,4-trifluorobutyrate predominantly. In contrast, NaBH4 reduction of the corresponding 2-oxobutyrate affords (2R★, 3S★)-hydroxyester preferentially.