高等学校化学学报 ›› 2013, Vol. 34 ›› Issue (4): 863.doi: 10.7503/cjcu20120852

• 有机化学 • 上一篇    下一篇

离子负载的双(三氟乙酰氧基)碘苯对乙酰苯胺类化合物的乙酰氧基化反应

张继振1, 张茂林2, 赵德建1, 王雅珍1, 贾洪斌1   

  1. 1. 江苏理工学院化学与环境工程学院, 常州 213001;
    2. 常州大学石油化工学院, 常州 213164
  • 收稿日期:2012-09-17 出版日期:2013-04-10 发布日期:2013-03-20
  • 通讯作者: 张继振,男,教授,主要从事有机合成研究.E-mail:zhangjizhen999999@yahoo.com.cn E-mail:zhangjizhen999999@yahoo.com.cn

Direct Acetoxylation of Anilides Using Ion-supported [Bis(trifluoroacetoxy)iodo] benzene

ZHANG Ji-Zhen1, ZHANG Mao-Lin2, ZHAO De-Jian1, WANG Ya-Zhen1, JIA Hong-Bin1   

  1. 1. School of Chemistry and Environmental Engineering, Jiangsu University of Technology, Changzhou 213001, China;
    2. School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China
  • Received:2012-09-17 Online:2013-04-10 Published:2013-03-20

摘要:

制备了1种新的含有酰胺键的离子负载的双(三氟乙酰氧基)碘苯固体试剂——1-甲基-3-[4鄄(双三氟乙酰氧基碘)苯甲酰胺基乙基]咪唑四氟硼酸盐. 该试剂无吸湿性, 在空气中长期放置不变质. 研究了1种离子负载的二(乙酰氧基)碘苯试剂和3种离子负载的双(三氟乙酰氧基)碘苯试剂对乙酰苯胺的对位乙酰氧基化反应. 结果表明, 离子负载的二(乙酰氧基)碘苯试剂氧化能力较弱, 乙酰氧基化产物产率较低; 含有酰胺键的2种离子负载的双(三氟乙酰氧基)碘苯试剂不发生乙酰氧基化反应; 而1-甲基-3-[4-双(三氟乙酰氧基)碘苯甲基]咪唑四氟硼酸盐是理想的氧化剂. 以1-甲基-3-[4-双(三氟乙酰氧基)碘苯甲基]咪唑四氟硼酸盐为氧化剂, 室温下乙酰苯胺及其衍生物与乙酸可区域选择性地发生乙酰氧基化反应, 产率较高. 回收后的离子负载的碘苯容易再生成试剂, 而再生试剂的乙酰氧基化反应活性几乎保持不变.

关键词: 功能性离子液体, 双(三氟乙酰氧基)碘苯, 1-甲基咪唑, 酰胺, 乙酰氧基化反应

Abstract:

1-[4-Iodobenzamidoethyl]-3-methylimidazolium tetrafluoroborate was prepared by the reaction of 1-methylimidazole with N-(2-chloroethyl)-4-iodobenzamide, then anion exchange with NaBF4 was performed in aqueous solution. The imidazolium tetrafluoroborates was oxidized to a novel ion-supported[bis(trifluoroacetoxy)iodo]benzene(BTI) reagent(solid) {1-[4-bis(trifluoroacetoxy) iodobenzamidoethyl]-3-methylimidazolium tetrafluoroborate} with amide linkage in a mixture of hydrogen peroxide and trifluoroacetic anhydride. The new reagent exhibited good stability in air or high humid atmosphere over several days.Direct acetoxylation of acetanilide using ion-supported(diacetoxyiodo)benzene(DIB) reagent and three ion-supported BTI reagents was studied. Due to low oxidation capacity of the ion-supported DIB reagent and low yields of its relative product, two ion-supported BTI reagents with amide linkage failed to carry out the acetoxylation reaction. However, 1-[4-bis(trifluoroacetoxy)iodobenzyl]-3-methylimidazolium tetrafluoroborat was an ideal oxidant. Treatment of various anilides with 1.1 mol of 1-[4-bis(trifluoroacetoxy)iodobenzyl]-3-methylimidazolium tetrafluoroborat and 1.0 mol of BF3稯Et2 in AcOH at room temperature afforded the corresponding para-acetoxylated products with high regioselectivity. After the acetoxylation, the reagent was transformed into ion-supported iodobenzene, which could be recovered and regenerated easily without lost of acetoxylation activity.

Key words: Task-specific ionic liquid, [Bis(trifluoroacetoxy)iodo]benzene, 1-Methylimidazole, Acylamide, Acetoxylation

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