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.
N-Heterocyclic carbene-catalyzed annulation of ynals with amidines: access to 1,2,6-trisubstituted pyrimidin-4-ones
作者:Yangxi Xie、Jian Wang
DOI:10.1039/c8cc02023j
日期:——
A thiazolium-catalyzed annulation of ynals and amidines has been reported to construct pyrimidin-4-ones.
一种噻唑嗪催化的ynals和胺亚胺的环化反应已被报道用于构建嘧啶-4-酮。
Substrate-Controlled Selectivity Switch in a Three-Component Reaction: A Ag-Catalyzed Strategy for the Synthesis of Functionalized Imidazoles
作者:Changcheng Wang、Enming Wang、Weixin Chen、Lijuan Zhang、Haiying Zhan、Yuanheng Wu、Hua Cao
DOI:10.1021/acs.joc.7b01781
日期:2017.9.1
An efficient Ag-catalyzed three-component reaction of amidines, ynals, and alcohols, phenols, or water has been developed. This strategy provides a wide range of substrates and represents a simple process for the preparation of different imidazole derivatives in good yields with high regioselectivities.
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.