第 47 卷第 3 期Vol. 47 No. 3
2017 年 6 月Jun 2017

所属栏目:农药及中间体

2-氰基-2,2-二(4-溴苄基)乙酸乙酯的合成
田宗明,毛 燕,秦永华,金小平 (浙江医药高等专科学校,浙江 宁波 315100)
摘 要:室温下,在二氯甲烷溶剂中,用三溴化硼溴化4-溴甲苯甲基侧链,合成了4-溴溴苄,收率84.4%;无水乙醇回流条件下,物料比n(4-溴溴苄) ∶ n(吡啶)=1 ∶ 1时,合成溴化N-(4-溴苄基)吡啶,收率95.3%;物料比n(溴化N-(4-溴苄基)吡啶) ∶ n(丙二腈)=2 ∶ 1时,合成2,2-二(4-溴苄基)丙二腈,收率67.0%;二氯亚砜催化2,2-二(4-溴苄基)丙二腈在有水的条件下醇解合成2-氰基-2,2-二(4-溴苄基)乙酸乙酯,收率65.3%。
关键词:4-溴溴苄;丙二腈;乙酸乙酯
中图分类号:O622.2  文献标识码:A  文章编号:1009-9212(2017)03-0011-05
Synthesis of 2-Cyano-2,2-bis(4-bromobenzyl) ethyl Acetate
TIAN Zong-ming, MAO Yan, QIN Yong-hua, JIN Xiao-ping (Zhejiang Pharmaceutical College, Ningbo 315100, China)
Abstract:A yield of 84.4% for the preparation of 4-bromobenzyl bromide was achieved using 4-bromotoluene as the raw material and boron tribromide as the brominating agent at room temperature. A N-(4-bromobenzyl)pyridine yield of 95.3%was obtained when the ratio of 4-bromobenzyl bromide/pyridine equal to 1 ∶ 1 under anhydrous ethanol refluxing. Then, N-(4-bromobenzyl) pyridine was reacted with malononitrile to give 2,2-bis(4-bromobenzyl)malononitrile, and a yield of 67.0% was obtained at N-(4-bromobenzyl)pyridine/malononitrile ratio of 2 ∶ 1. At the presence of water and thionyl chloride as the catalyst, a yield of 65.3% for 2-cyano-2,2-bis(4-bromobenzyl)ethyl acetate was achieved from alcoholization reaction of 2,2-bis(4-bromobenzyl) malononitrile.
Key words:4-bromobenzy; malononitrile; ethyl acetate
基金项目:浙江省教育厅科研项目(Y201534687),宁波市自然科学基金项目(2016A610237)。
作者简介:田宗明(1978-),男,湖北宣恩人,讲师,硕士,研究方向:药物及中间体合成(E-mail:tzmming@163.com)。
收稿日期:2017-05-26