Modern Friedel-Crafts Chemistry. Part 37. Efficient Syntheses of Some New Julolidines via Cyclialkylations of Heteroaryl Carbinols
作者:Hassan A. K. Abd El-Aal、Ali A Khalaf、Ahmed M. A El-Khawaga
DOI:10.1002/jhet.1797
日期:2014.1
A simple and convenient procedure for the synthesis of some novel alkyl‐substituted and aryl‐substituted julolidines is reported. Julolidines were smoothly synthesized in excellent isolated yields via Friedel–Crafts intramolecular alkylations of heteroarylalkanols in the presence of both Brønsted (PPA) and Lewis (AlCl3/CH3NO2) acid catalysts. The precursors alkanols, 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h
报道了一种简单方便的合成某些新的烷基取代的和芳基取代的聚甲基吡啶的方法。通过在Brønsted(PPA)和Lewis(AlCl 3 / CH 3 NO 2)酸催化剂的存在下,通过杂芳基链烷醇的Friedel-Crafts分子内烷基化反应,能够以优异的分离收率平稳合成朱罗烷啶。链烷醇的前体1a,1b,1c,1d,1e,1f,1g,1h,1i通过选择性地合成的羧酸酯和酮与不同的格氏试剂的反应,以及通过用LAH还原合成的酮,都可以容易地制备α-己内酰胺。提出了一种合理的碳正离子化机制来解释结果。使用光谱数据和分析数据来确定化合物的结构。