An efficient copper-catalyzed radical ring-opening halogenation with HX (aq) is described. This protocol features redox-neutral conditions, green halogen sources, and a broad substrate scope, providing practical access to distally chlorinated, brominated and iodinated alkyl ketones and alkyl nitriles with moderate to good yields.
In-situ-generation of alkylsilyl peroxides from alkyl hydroperoxides and their subsequent copper-catalyzed functionalization with organosilicon compounds
Alkylsilyl peroxides were generated in situ from the corresponding alkyl hydroperoxides using organosilicon compounds of the type Me3SiX (X = CN, N3, and halogens) and an amine base. Subsequent in situ copper-catalyzed homolytic cleavage of the alkylsilyl peroxides afforded alkyl radicals, which were then trapped with X (X = CN, N3, and halogens) to furnish products with new carbon-carbon, carbon-nitrogen
A new approach for the copper-catalyzed functionalization of alkyl hydroperoxides with organosilicon compounds via in-situ-generated alkylsilyl peroxides
Using organosilicon compounds of the type Me3SiX (X = CN, N3, CnF2n+1, and halogens) and an amine base, alkylsilyl peroxides were generated in situ from the corresponding alkyl hydroperoxides. Subsequent in situ copper-catalyzed homolytic cleavage of the alkylsilyl peroxides afforded alkyl radicals, which were then trapped with a nucleophile X (X = CN, N3, CnF2n+1, and halogens) to furnish coupling
使用 Me 3 SiX 类型的有机硅化合物(X = CN、N 3、C n F 2n+1和卤素)和胺碱,由相应的烷基氢过氧化物原位生成烷基甲硅烷基过氧化物。随后的原位铜催化均裂烷基过氧化硅得到烷基自由基,然后被亲核试剂 X (X = CN, N 3 , C n F 2n+1, 和卤素) 以提供具有新碳-碳、碳-氮或碳-卤素键的偶联产物,产率从好到高。此外,1-(三甲基甲硅烷基)吗啉还可用于原位生成过氧化烷基甲硅烷基,随后高效地用于酰胺的N-烷基化、芳基化和硼基化。
Preventives/remedies for urinary disturbance
申请人:Ishihara Yuji
公开号:US20050197362A1
公开(公告)日:2005-09-08
Preventives/remedies for voiding disturbance containing a compound having both of an acetylcholinesterase inhibitory action and an α1 antagonistic action which exhibits an excellent effect of improving the urinary function of the bladder (i.e., effects of improving urine flow rate and voiding efficiency) without affecting the urinary pressure or the blood pressure.
Preventives/remedies for voiding disturbance containing a compound having both of an acetylcholinesterase inhibitory action and an α1 antagonistic action which exhibits an excellent effect of improving the urinary function of the bladder (i.e., effects of improving urine flow rate and voiding efficiency) without affecting the urinary pressure or the blood pressure.