第 48 卷第 1 期Vol. 48 No. 1
2018 年 2 月Feb 2018

所属栏目:医药及中间体

8-酰基咖啡因类似物的合成研究
郭胜利,李志成*,孙纲春 (河南工业大学 化学化工与环境学院,河南 郑州 450001)
摘 要:以茶碱和溴代烷为原料,合成了中间体7-烷基咖啡因。在硝酸银催化和过硫酸钾氧化作用下,7-烷基咖啡因与α-羰基酸发生自由基取代反应,得到4种8-酰基咖啡因类似物,并对其结构进行了表征。考察了催化剂用量、氧化剂用量、溶剂体系、反应温度等因素对产品收率的影响,优化反应条件为:催化剂硝酸银的用量为20%、n(7-丁基咖啡因)∶n(过硫酸钾)= 1.0∶2.0、反应溶剂为乙腈/水、反应温度100℃。优化条件下,目标化合物1 的总收率为54.5%~59.2%。
关键词:8-酰基咖啡因类似物;茶碱;1,3-二甲基-7-丁基-8-乙酰基黄嘌呤;α-羰基酸
中图分类号:TQ464  文献标识码:A  文章编号:1009-9212(2018)02-0035-03
Synthesis of 8- Substituted Acyl Caffeine Analogues
GUO Sheng-li, LI Zhi-cheng*, SUN Gang-chun (College of Chemistry, Chemical and Environmental Engineering, Henan University of Techonology, Zhengzhou 450001, China)
Abstract:1,3-Dimethyl-7-alkylxanthine was prepared from theophylline and alkyl bromide. Using AgNO3 as catalyst and K2S2O8 as oxidant, 8-substituted acyl caffeine analogues were synthesized via free radical reaction between 1,3-dimethyl-7-alkylxanthine and α-oxo carboxylic acid. Their structures were characterized using 1H NMR and 13C NMR. The factors influencing the yield of the reaction were studied. The optimum reaction conditions were as following: the amount of catalyst of 20%, 1.0∶2.0 as the ratio of n(7-butyl caffeine)/n(K2S2O8), a mixture of CH3CN and H2O as reaction solvent and reaction temperature of 100℃. The total yield of the target product was up to 54.5%~59.2%.
Key words:8-substituted acyl caffeine analogue; theophylline; 1,3-dimethyl-7-butyl-8-acetylxanthine; α-oxo carboxylic acid
基金项目:国家自然科学基金项目(21302042),河南省科技攻关计划项目(162102210040)。
作者简介:郭胜利(1993-),男,河南荥阳人,硕士研究生,主要从事有机合成、药物合成。
联 系 人:李志成,副教授,硕士生导师,主要从事有机合成、药物合成(E-mail:zzlzc@163.com)。
收稿日期:2018-02-10