A straightforward method to synthesize imidazole derivatives from amidines and sulfoxonium ylides catalyzed by acids is reported in this study. Specifically, catalyzed by trifluoroacetic acid in DCE solvents can improve synthesis efficiency under metal-free conditions. A series of imidazole scaffolds were produced in good to excellent yields.
Copper-Catalyzed Oxidative Diamination of Terminal Alkynes by Amidines: Synthesis of 1,2,4-Trisubstituted Imidazoles
作者:Jihui Li、Luc Neuville
DOI:10.1021/ol400560m
日期:2013.4.5
An efficientcopper-catalyzedsynthesis of 1,2,4-trisubstituted imidazoles using amidines and terminalalkynes has been developed. Overall, the oxidative process, which involves Na2CO3, pyridine, a catalytic amount of CuCl2·2H2O, and oxygen (1 atm), consisted of a regioselective diamination of alkynes allowing the synthesis of diverse imidazoles in modest to good yields.
已经开发了使用am和末端炔烃的铜催化的1,2,4-三取代的咪唑的高效铜催化合成。总体而言,该氧化过程涉及Na 2 CO 3,吡啶,催化量的CuCl 2 ·2H 2 O和氧气(1个大气压),由炔烃的区域选择性加重反应组成,从而可以适度地合成出各种咪唑。产量。
I<sub>2</sub>-Catalyzed diamination of acetyl-compounds for the synthesis of multi-substituted imidazoles
We have successfully developed the I2-catalysed synthesis of substituted imidazole derivatives from amidines and ketones in good to excellent yields and 100% regioselectivity.