reductive monoalkyl- ation of amines and amine derivatives with aldehydes is reported. Treatment of aldehydes with primary amines, secondaryamines, O- trimethylsilylhydroxylamine, and N,N-dimethylhydrazine in lithi- um perchlorate/diethylether and trimethylsilyl chloride, followed by BH3·NEt3 reduction, and straightforward workup afforded sec- ondary amines, tertiary amines, N-substituted hydroxylamines
Organocatalytic Enantioselective Dipolar [3+2] Cycloadditions of Acetylenic Aldehydes with Nitrones for the Formation of Chiral 4-Isoxazolines
作者:Xianrong Cai、Chao Wang、Jian Sun
DOI:10.1002/adsc.201100351
日期:2012.2
organocatalytic enantioselective protocol has been developed for the dipolar [3+2] cycloaddition between acetylenic aldehydes and nitrones through an iminium activation pathway. This protocol uses L-α,α-bis(3,5-ditrifluoromethylphenyl)prolinol as catalyst and 3,5-dinitrobenzoic acid as additive and is friendly for one-pot operation for the nitrone formation and the subsequent cycloaddition. It also exhibits
Synthesis and Reactions of<i>N</i>-Alkyl-<i>O</i>-diphenylphosphinylhydroxylamines and<i>N</i>-Alkyl-<i>N</i>-diphenylphosphinylhydroxylamines
作者:Guy Masse、Georges Sturtz
DOI:10.1055/s-1988-27749
日期:——
Reaction of a series of primary amines with bis(diphenylphosphinyl) peroxide conveniently leads to N-alkyl-O-diphenylphosphinylhydroxylamines. These compounds rearrange on heating to the thermodynamically more stable N-phosphinylated derivatives, the N-alkyl-N-diphenylphosphinylhydroxylamines (N-alkyldiphenylphosphinohydroxamic acids).
Disclosed are novel thioether furan nitrone compounds and pharmaceutical compositions containing such compounds. The disclosed compositions are useful as therapeutics for preventing and/or treating neurodegenerative, autoimmune and inflammatory conditions in mammals and as analytical reagents for detecting free radicals.
Disclosed are furan nitrone compounds and pharmaceutical compositions containing such compounds. The disclosed compounds are useful as analytical reagents for detecting free radicals and as therapeutics for treating a wide variety of medical dysfunctions and diseases.