The efficient construction of 2,4,5-trisubstituted imidazoles, through a copper-mediated three-component reaction involving ketones, aldehydes, and Me3SiN3, has been developed.
One-Pot, Two-Step Metal and Acid-Free Synthesis of Trisubstituted Imidazole Derivatives via Oxidation of Internal Alkynes Using an Iodine/DMSO System
作者:Shivani Naidoo、Vineet Jeena
DOI:10.1002/ejoc.201801584
日期:2019.2.7
A one‐pot, two‐step, simple, efficient and eco‐friendly oxidation of internal alkynes as a key step towards the synthesis of 2,4,5‐trisubstituted imidazoles, using an inexpensive I2/DMSO system, has been reported. This metal and acid‐free reaction proceeded smoothly to furnish a variety of substituted imidazoles in moderate to excellent yields.
practical aerobic benzylic sp3 C–H oxidation as a key step towards the domino multi-component synthesis of 2,4,5-trisubstituted imidazoles has been reported. This green methodology employs an inexpensive catalytic copper/oxygen system and proceeds under mild reaction conditions. A variety of substituted imidazoles are prepared in moderate to excellent yields from α-methylene ketones using this innovative
Imidazole synthesis by transition metal free, base-mediated deaminative coupling of benzylamines and nitriles
作者:Uttam Kumar Das、Linda J. W. Shimon、David Milstein
DOI:10.1039/c7cc08322j
日期:——
A transition metal free, straightforward synthetic method for the preparation of substituted imidazoles is reported herein. Base promoted, deaminative coupling of benzylamines with nitriles results in the one-step synthesis of 2,4,5-trisubstituted imidazoles with liberation of ammonia. This protocol provides a practical strategy for the synthesis of valuable imidazole derivatives from readily available
Metal-Controlled Switchable Regioselective Synthesis of Substituted Imidazoles and Pyrroles <i>via</i> Ring Opening/Cyclocondensation with 2<i>H</i>-Azirines
作者:Fen Xu、Wen-Jing Zhu、Pei-Wen Wang、Jia Feng、Xin-Ru Chen、Xiao-Hong Han、Hao-Tian Yan
DOI:10.1021/acs.joc.3c00430
日期:2023.7.21
ring opening/heterocyclization associated with direct cleavage of C–N and C–C bonds under appropriate conditions, the formation of imidazoles is presented. Alternatively, the silver-catalyzed radical [3 + 2] cycloannulation of 2H-azirines and 1,3-dicarbonyl compounds provides highly functionalized pyrrole derivatives. Both aliphatic cyclic and acyclic diketones are tolerated with good regioselectivity