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    • 2. 发明授权
    • Efficient synthesis of secondary amines by selective alkylation of primary amines
    • 通过伯胺的选择性烷基化高效合成仲胺
    • US06423871B1
    • 2002-07-23
    • US09513219
    • 2000-02-25
    • Kyung Woon Jung
    • Kyung Woon Jung
    • C07C21100
    • C07C209/08C07C213/00C07C227/18C07C319/20C07C2601/14C07C2601/18C07C2603/74C07D257/02C07D307/33Y02P20/55C07C323/25C07C211/08C07C211/27C07C211/35C07C215/08C07C217/08C07C229/12C07C229/14
    • A method for selective mono-N-alkylation of primary amines to produce secondary amines that are substantially free of overalkylated tertiary amines and quaternary ammonium salts, under mild reaction conditions without the necessity of protecting groups. Compounds of the class of secondary amines are produced by reacting an alkyl halide with an alkyl amine in anhydrous solvent, preferably dimethyl sulfoxide or N,N-dimethylformamide, in the presence of 0.1 to 3 molar equivalents of a cesium base. Optionally, the extent and selectivity of mono-N-alkylation is enhanced by addition to the reaction mixture of a powdered molecular sieve material for removal of water produced by the reaction, and/or tetrabutylammonium iodide to promote halide exchange. The invention permits selective and efficient mono-N-alkylation of a wide variety of substrates at 23° C.; does not cause racemization when used with enantiomerically-pure chiral substrates such as L-&agr;-aminoesters; and is applied to solid phase synthesis whereby either the alkyl amine or alkyl halide is immobilized. The method is additionally used to produce polyamines, such as N-(2-(2-aminoethylthio)ethyl)ethylenediamine in 73% yield.
    • 在温和的反应条件下,不需要保护基团,伯胺的选择性单-N-烷基化制备基本上不含过烷基化的叔胺和季铵盐的仲胺的方法。 通过在0.1至3摩尔当量的铯碱存在下,使烷基卤与烷基胺在无水溶剂,优选二甲基亚砜或N,N-二甲基甲酰胺中反应来制备仲胺类化合物。 任选地,通过加入用于除去由反应产生的水的粉末状分子筛材料的反应混合物和/或四丁基碘化铵促进卤化物交换,增强了单-N-烷基化的程度和选择性。 本发明允许在23℃下选择性和有效地对各种底物进行单-N-烷基化反应; 当与对映体纯的手性底物如L-α-氨基酯一起使用时不引起外消旋化; 并用于固相合成,由此固定烷基胺或烷基卤。 该方法另外用于制备多胺,如N-(2-(2-氨基乙硫基)乙基)乙二胺,产率为73%。