A rapid and convenient preparation of acyclicimides by the reaction of aliphatic and aromatic nitriles with acyclic carboxylic anhydride in the presence of catalytic amounts of p-toluenesulfonic acid under thermal or ultra- sonic conditions is reported. The advantages of this procedure are moderate reaction times, good to excellent yields, and use of an inexpensive and eco- friendly catalyst. The
We have developed a general and highlyefficientiron(II) chloride/N-bromosuccinimide (NBS)-mediated method for the synthesis of imides and acylsulfonamides via couplings of thioesters with carboxamides/sulfonamides, and the method is simple, economical and shows practical advantages.
Efficient synthesis of symmetrical and unsymmetrical acyclic imides catalyzed by reusable 12-tungstophosphoric acid under thermal conditions and microwave irradiation
for the synthesis of symmetrical and unsymmetrical acyclic imides by the reaction of nitriles with acyclic anhydrides in the presence of catalytic amounts of 12-tungstophosphoric acid (H3PW12O40) under thermal conditions and microwaveirradiation. It was found that microwave improves the yields and significantly reduces the reaction times. Furthermore, the catalyst could be recovered and reused several
通过在热条件下和微波条件下,在催化量的12钨磷酸(H 3 PW 12 O 40)存在下,腈与无环酸酐反应,合成对称和不对称无环酰亚胺的方法已经开发出来,是一种有效且环保的方法。辐射。发现微波提高了产率并显着减少了反应时间。此外,催化剂可以被回收并重复使用几次而不会降低其活性。
Copper mediated oxidation of amides to imides by Selectfluor
作者:Zhuang Jin、Bo Xu、Gerald B. Hammond
DOI:10.1016/j.tetlet.2011.02.059
日期:2011.4
The combination of Selectfluor and copper(I) bromide has shown a strong oxidation ability, readily oxidizing amides into the corresponding imides in acetonitrile at room temperature in less than 1 h. This transformation under mild conditions gives good to excellent chemical yields. A possible reaction mechanism is proposed. (C) 2011 Elsevier Ltd. All rights reserved.
Replacement of BF4− by PF6− makes Selectfluor greener
作者:Zhuang Jin、Bo Xu、Stephen G. DiMagno、Gerald B. Hammond
DOI:10.1016/j.jfluchem.2012.05.010
日期:2012.11
A combination of F-TEDA-PF6 and CuBr (0.1 equiv.) provides a potent oxidant that readily oxidizes amides to provide imides at room temperature. Replacement of BF4-, the anion of Selectfluor (F-TEDA-BF4), by PF6-, dramatically reduces CuBr loading in this oxidative reaction. A possible rationale for this dramatic counterion effect is provided. (C) 2012 Elsevier B.V. All rights reserved.