A convenient new synthesis of α-fluorocarbonyl compounds
作者:Albert J. Fry、Yoelit Migron
DOI:10.1016/s0040-4039(01)95408-5
日期:1979.1
The reaction between tertiary α-bromo ketones or aldehydes and silver tetrafluoroborate in ether affords α-fluorocarbonyl compounds. Neighboring group participation by the carbonyl oxygen is proposed to account for the products and by-products.
An NMR, IR and theoretical investigation of the methyl effect on conformational isomerism in 3-fluoro-3-methyl-2-butanone and 1-fluoro-3,3-dimethyl-2-butanone
作者:Cl�udio F. Tormena、Roberto Rittner、Raymond J. Abraham
检查了3-氟-3-甲基-2-丁酮(FMB)和1-氟-3,3-二甲基-2-丁酮(FDMB)的1 H和13 C NMR谱图的溶剂依赖性,并确定了4 J据报道有HF,1 J CF和2 J CF联轴器。使用B3LYP / 6–311 ++ G(2df,2p)级别的密度泛函理论(DFT)和ZPE(零点能量)校正来获得构象几何体。在FMB和FDMB中,DFT方法仅给出了顺式(F C C O,0°)和反式(F C C O,180°)旋转异构体的两个最小值。假设顺式反式和反式,当通过溶剂化理论分析时,在FMB中观察到的偶合给出了汽相中的能量差E cis - E trans为3.80 kcal mol -1(1 kcal = 4.184 kJ)(参见DFT值为3.21 kcal mol -1),在CCl 4中降至2.6 kcal mol -1,在DMSO中降至0.27 kcal mol -1。在FDMB
Imidazo-triazine derivatives as ligands for GABA receptors
申请人:——
公开号:US20030055060A1
公开(公告)日:2003-03-20
A class of 7-phenylimidazo[1,2-b][1,2,4]triazine derivatives, substituted at the meta position of the phenyl ring by a (cyano)(fluoro)phenyl moiety, being selective ligands for GABA
A
receptors, in particular having good affinity for the &agr;2 and/or &agr;3 subunit thereof, are accordingly of benefit in the treatment and/or prevention of adverse conditions of the central nervous system, including anxiety and convulsions.
Imidazo-pyrimidine derivatives as ligands for gaba receptors
申请人:——
公开号:US20020193385A1
公开(公告)日:2002-12-19
A class of 3-phenylimidazo[1,2-&agr;]pyrimidine derivatives, substituted at the meta position of the phenyl ring by an optionally substituted aryl or heteroaryl group which is directly attached or bridged by an oxygen atom or a —NH— linkage, and further substituted on the phenyl ring by alkyl, trifluoromethyl, alkoxy or one or two halogen atoms, especially fluoro, are selective ligands for GABA
A
receptors, in particular having good affinity for the &agr;2 and/or &agr;3 and/or &agr;5 subunit thereof, and are accordingly of benefit in the treatment and/or prevention of adverse conditions of the central nervous system, including anxiety, convulsions and cognitive disorders.
Imidazo-triazine derivatives as ligands for gaba receptors
申请人:——
公开号:US20040023964A1
公开(公告)日:2004-02-05
A class of 7-phenylimidazo[1,2-b][1,2,4]triazine derivatives, substituted at the meta position of the phenyl ring by an optionally substituted aryl or heteroaryl group which is directly attached or bridged by an oxygen atom or a —NH— linkage, being selective ligands for GABA
A
receptors, in particular having good affinity for the &agr;2 and/or &agr;3 and/or &agr;5 subunit thereof, are accordingly of benefit in the treatment and/or prevention of adverse conditions of the central nervous system, including anxiety, convulsions and cognitive disorders.