In this research, greensynthesis of imidazo[1,2-a]pyridines in the presence of calix[n]arenes-SO3H as a Brønsted acid catalyst and surfactant is described. Using of calix[n]arenes in water provided a hydrophobic cavity that successfully carried out the synthesis reactions at short times with high yields. This catalyst system is recoverable with a simple extraction using an organic solvent and reusable
在这项研究中,描述了在杯[ n ]芳烃-SO 3 H作为布朗斯台德酸催化剂和表面活性剂的存在下绿色合成咪唑并[1,2- a ]吡啶。在水中使用杯芳烃[ n ]芳烃提供了疏水腔,该腔在短时间内成功地以高收率成功地进行了合成反应。该催化剂体系可通过使用有机溶剂的简单萃取而回收,并且可重复使用至少5个循环而不会损失其活性。
Visible-light-activated C–C and C–N bond formation in the synthesis of imidazo[1,2-<i>a</i>]pyridines and imidazo[2,1-<i>b</i>]thiazoles under catalyst and solvent-free conditions
作者:Km Neha Shivhare、Manish K. Jaiswal、Anushree Srivastava、Saurabh K. Tiwari、I. R. Siddiqui
DOI:10.1039/c8nj03339k
日期:——
Synthesis of 3-aminoimidazo-fused heterocycles via the Groebke–Blackburn–Bienaymé reaction using a universally available energy source under catalyst and solvent-free conditions.
A facile protocol for the synthesis of 3-aminoimidazo-fused heterocycles via the Groebke–Blackburn–Bienayme reaction under catalyst-free and solvent-free conditions
作者:Shinde Vidyacharan、Anand H. Shinde、Bishnupada Satpathi、Duddu S. Sharada
DOI:10.1039/c3gc42130a
日期:——
A one-pot catalyst, solvent, work-up and column free synthesis of 3-aminoimidazo-fused heterocycles by a three-component reaction of a 2-aminoheterocycle, aldehyde, and isocyanide is presented. This efficient and green protocol has the advantages of environmental friendliness, high yields and operational simplicity.
Metal-organic framework of amine-MIL-53(Al) as active and reusable liquid-phase reaction inductor for multicomponent condensation of Ugi-type reactions
作者:Sadegh Rostamnia、Maryam Jafari
DOI:10.1002/aoc.3584
日期:2017.4
be active in the Groebke–Blackburn–Bienaymé multicomponent coupling reaction based on Ugi‐type amine and aldehyde condensation over isocyanide and then a cyclization process. Interestingly this reaction occurred under solvent‐free conditions with high yield, in which the NH2‐MIL‐53(Al) could be recovered and reused for five reaction cycles, giving a total turnover number of 455.
Tandem oxidative isocyanide-based cycloaddition reactions in the presence of MIL-101(Cr) as a reusable solid catalyst
作者:Ahmad Shaabani、Heshmatollah Sepahvand、Mostafa M. Amini、Alireza Hashemzadeh、Mahmoud Borjian Boroujeni、Elham Badali
DOI:10.1016/j.tet.2018.02.046
日期:2018.4
The tandem oxidative three-component synthesis of two types of the heterocycles such as furans and imidazopyridines, via isocyanides [1+4] cycloadditionreactions in the presence of MIL-101(Cr) under aerobic conditions are reported. When the 4-toluenesulfonylmethyl isocyanide was used, an unexpected [3+2] cycloadditionreaction of isocyanides with aldehydes accomplished and dihydrophenyloxazoles and