首页> 外文期刊>Arabian Journal for Science and Engineering >Side-Chain Lithiation of N'-(4-Chlorophenethyl)- and N'-(4-Methylphenethyl)-N,N-dimethylureas: Experimental and Theoretical Approaches
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Side-Chain Lithiation of N'-(4-Chlorophenethyl)- and N'-(4-Methylphenethyl)-N,N-dimethylureas: Experimental and Theoretical Approaches

机译:N'-(4-氯苯乙基)-和N'-(4-甲基苯乙基)-N,N-二甲基脲的侧链锂化:实验和理论方法

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摘要

-Lithiation of -(4-chlorophenethyl)- and -(4-methylphenethyl)-N, N-dimethylureas occurs using t-butyllithium (3.3 molar equivalents) in dry tetrahydrofuran at 60 to 0 on NH and on the next to the aryl ring. The lithium reagents generated in situ are trapped with several electrophiles (benzophenone, cyclohexanone, 2-butanone, 4-anisaldehyde, and benzaldehyde) to afford the corresponding substituted ureas in 79-96% yields. The experimental results were sustained by density functional theory calculations, which show that the side chain on the adjacent to the aryl ring is the most favorable site for the -lithiation of -(4-chlorophenethyl)-N, N-dimethylurea and -(4-methylphenethyl)-N, N-dimethylurea.
机译:使用叔丁基锂(3.3摩尔当量)在无水四氢呋喃中于NH上和芳基环旁边的60至0位置进行-(4-氯苯乙基)-和-(4-甲基苯乙基)-N,N-二甲基脲的锂化反应。用几种亲电试剂(二苯甲酮,环己酮,2-丁酮,4-茴香醛和苯甲醛)捕获就地生成的锂试剂,以79-96%的收率得到相应的取代脲。实验结果通过密度泛函理论计算得以维持,结果表明,芳基环附近的侧链是-(4-氯苯乙基)-N,N-二甲基脲和-(4 -甲基苯乙基)-N,N-二甲基脲。

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