The efficient construction of 2,4,5-trisubstituted imidazoles, through a copper-mediated three-component reaction involving ketones, aldehydes, and Me3SiN3, has been developed.
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
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