Copper-Catalyzed Three-Component Synthesis of 3-Aminopyrazoles and 4-Iminopyrimidines via β-Alkynyl-<i>N</i>-sulfonyl Ketenimine Intermediates
作者:Yanpeng Xing、Binyu Cheng、Jing Wang、Ping Lu、Yanguang Wang
DOI:10.1021/ol502302w
日期:2014.9.19
4-iminopyrimidines were efficiently prepared via copper-catalyzedthree-componentreactions of butadiynes, sulfonylazides, and hydrazides or imidamides. The reactions were regioselectively approached via the formation of a β-alkynyl-N-sulfonyl ketenimine intermediate which represented a new and effective 1,3-dielectrophilic equivalent in organic synthesis.
Silver-catalyzed [3 + 2] domino reaction: an efficient strategy to synthesize imidazole-5-carbaldehydes
作者:Changcheng Wang、Hangqi Jiang、Weifeng Chen、Jun Dong、Zhengwang Chen、Hua Cao
DOI:10.1039/c7ob01242j
日期:——
An unprecedented regioselective silver-catalyzed [3 + 2] domino reaction of amidines and ynals for the formation of C–N bonds has been developed. The reaction provided a new route to prepare imidazole-5-carbaldehydes which are important intermediates for the construction of fine chemicals. The reaction proceeds smoothly with a broad range of substrates to give imidazoles in good yields.
Controllable Site-Selective Construction of 4- and 5-Hydroxyalkyl-Substituted Imidazoles from Amidines, Ynals, and Water
作者:Wei Liu、Jiaming He、Xiang Liu、Yue Yu、Yongyan Pei、Baofu Zhu、Hua Cao
DOI:10.1021/acs.joc.0c01715
日期:2020.12.4
site-selective pathways to construct 4- and 5-hydroxyalkyl-substituted imidazoles through a three-component reaction of amidines, ynals, and water has been documented. Particularly, the high regioselectivity of the reaction was simply switched by changing the additives. In addition, further 18O-labeled experiments to probe a plausible mechanism and the gram-scale synthesis were studied.
Ag-Catalyzed Tandem Three-Component Reaction toward the Synthesis of Multisubstituted Imidazoles
作者:Changcheng Wang、Jialin Lai、Cantao Chen、Xuechen Li、Hua Cao
DOI:10.1021/acs.joc.7b02612
日期:2017.12.15
A facile one-pot, Ag-catalyzed tandem three-component reaction of amidines, ynals, and carboxylic acids or amines to form imidazole skeletons has been developed. This multicomponent reaction has been applied to various substituted amidines and carboxylic acids substrates, affording the products in good yields. The strategy could provide an efficient and green molecular fragment assembly to access imidazoles