Cyclisation reactions of some 3-nitrosoimidazo[1,2-a]-pyridines and-pyrimidines. Ring-opening/ring-closure reactions with triethyl phosphite: reassignment by X-ray crystal structure and nuclear magnetic resonance
作者:Jean C. Teulade、Roger Escale、Henry Viols、Jean P. Chapat、Gérard Grassy、Alain Carpy、Jean M. Léger
DOI:10.1039/p19830002663
日期:——
Deoxygenation of 3-nitroso-2-phenylimidazo[1,2-a]-pyridines and -pyrimidines with triethyl phosphite does not lead to the products described in the literature as pyrido- and pyrimido-imidazoindoles (3) and (4), but to the open-chain derivatives, N-(2-pyridyl)- and N-(2-pyrimidyl)-benzimidoyl cyanides (5) and (6). X-Ray crystallographic analysis confirms the structure of (5a): orthorhombic system with
3-亚硝基-2-苯基咪唑并[1,2- a ]-吡啶和-嘧啶与亚磷酸三乙酯的脱氧作用不会导致文献中所述的产物为吡啶基和嘧啶基-咪唑并吲哚(3)和(4),但开链衍生物N-(2-吡啶基)-和N-(2-嘧啶基)-苯并亚甲基氰化物(5)和(6)。X射线晶体学分析证实了(5a)的结构:正交晶系,a = 24.377(6),b = 11.729(3),c = 7.534(2)Å,空间群Pbca,Z = 8,d = 1.27 g /厘米3,- [R= 0.061。用化合物(5)和(6)的亚磷酸三乙酯热闭环产生3-氨基-2-苯基咪唑并[1,2- a ]-吡啶和-嘧啶(8)和(9)。
Ionic Liquid Promoted One-Pot Three-Component Reaction: Synthesis of Annulated Imidazo[1,2-a]azines Using Trimethylsilylcyanide
作者:Ahmad Shaabani、Ali Maleki
DOI:10.1007/s00706-006-0567-0
日期:2007.1
Imidazo[1,2- a ]azine derivatives are synthesized by a one-potthree-component reaction of an 2-aminoazine, an aldehyde, and trimethylsilylcyanide in the presence of 1- n -butyl-3-methylimidazolium bromide as a recoverable ionicliquid, in moderate to excellent yields with relatively short reaction times.
咪唑并[1,2- a ]嗪衍生物是通过2-氨基嗪,醛和三甲基甲硅烷基氰化物在1 - n- 丁基-3-甲基咪唑鎓溴化物作为可回收离子存在下的一锅三组分反应合成的 液体,产率中等至优异,反应时间相对较短。
Ultrasonic assisted synthesis of imidazo[1,2-a]azine catalyzed by ZnO nanorods
作者:Samaheh Sadjadi、M. Eskandari
DOI:10.1016/j.ultsonch.2012.09.006
日期:2013.3
ZnO nanorods have been successfully used as an efficient, economic, and reusable catalyst for the synthesis of imidazo[1,2-a]azine under ultrasonic irradiation. This procedure offers advantages in terms of higher yields, short reaction times and mild reaction conditions. (C) 2012 Elsevier B.V. All rights reserved.
ZnO nanorods as an efficient catalyst for the synthesis of imidazo[1,2-a]azines and diazines
作者:Samahe Sadjadi、Mehdi Eskandari
DOI:10.1007/s00706-011-0655-7
日期:2012.4
ZnO nanorods were synthesized using a novel and solvent-free procedure and their catalytic activity in the preparation of imidazo[1,2-a]azines and diazines was studied. The effects of the amount of catalyst and its reusability were investigated to optimize the reaction conditions. The ZnO nanorods exhibited higher catalytic activity than that of bulk ZnO.