Selective synthesis of (Z)-2-enynyl-2-hydroxy-imidazolidine-4,5-diones via Cu(<scp>i</scp>)-mediated multicomponent coupling of terminal alkynes, carbodiimides and oxalyl chloride
作者:Fei Zhao、Yuexing Li、Yang Wang、Wen-Xiong Zhang、Zhenfeng Xi
DOI:10.1039/c4ob00185k
日期:——
(Z)-2-Enynyl-2-hydroxy-imidazolidine-4,5-diones 2 are synthesized for the first time via Cu(I)-mediated (Z)-selective geminal coupling among two molecules of terminal alkynes, carbodiimides, and oxalylchloride. Further transformation of 2a is performed to yield a highly functionalized spiro heterocyclic compound 5.
Phenols are considered as an ideal alternative to aryl halides as coupling partners in cross-coupling reactions. In the present work a copper-catalyzed cross-coupling of phenols with various aromatic and aliphatic amines for the synthesis of secondary aryl amines using dichloroimidazolidinedione (DCID) as a new and efficient activating agent has been developed. Substituted phenols were compatible with
Metal-free synthesis of cyclic di-oxoguanidines via one-pot sequential transformation of amines, carbodiimides and acyl dichlorides
作者:Fei Zhao、Yang Wang、Wen-Xiong Zhang、Zhenfeng Xi
DOI:10.1039/c2ob25799h
日期:——
The one-pot sequential reaction of various amines, carbodiimides, and acyl dichlorides has been achieved for the first time under metal-free conditions to provide symmetric cyclic di-oxoguanidines via an unexpected 2,2-dichloro-imidazolidindione intermediate. Acyl dichlorides have a dual function: to serve as the third component and to activate carbodiimides. In sharp contrast, the AlMe3-catalyzed sequential reaction from the same substrates gives the isomer.
method for the Suzuki‐type cross‐coupling of phenols with aryl boronic acids using dichloroimidazolidinedione (DCID) as a new reagent is presented. In the presence of DCID and Pd/metal–organic framework (MOF), coupling of aryl boronic acids with a wide range of phenols, was carried out smoothly in tetrahydrofuran (THF) at reflux conditions to afford the cross‐coupling products in good to excellent yields
DCID-mediated Heck cross-coupling of phenols <i>via</i> C–O bond activation
作者:Negin Hosseini、Javad Mokhtari、Issa Yavari
DOI:10.1039/d1nj06120h
日期:——
In this work a palladium-catalyzed Heck cross-coupling of phenols using dichloroimidazolidinedione (DCID) as a new reagent for the activation of C–O bonds has been developed for the first time.