A [Cp*Rh(III)]-catalyzed electrophilicamination of arylboronic acids with diethyl azodicarboxylate (DEAD) was developed, and arylhydrazides were produced in excellent yields and selectivity. The analogous amination with the arylazocarboxylates afforded the corresponding N,N-diarylhydrazides. The electrophilicamination of arylboronic acids with azocarboxylates proceeds readily under mild conditions
A process for the transesterification of urethanes comprises reacting a urethane with an alcohol at elevated temperature in the presence of a Lewis base containing catalyst.
The process is particularly useful when the alcohol used is a polyol since the product of the transesterification is a polyurethane. Since urethanes can be generated from amines and organic carbonates using the methods of the prior art, the present invention provides processes for the manufacture of polyurethanes from amines which avoid the use of either phosgene or isocyanates both of which are extremely toxic.
Copper-catalyzed C–N bond formation using dialkyl azodicarboxylate as the amination reagent
作者:Alireza Samzadeh-Kermani
DOI:10.1016/j.tetlet.2015.12.036
日期:2016.1
An efficient copper-catalyzed reaction for C-N bond formation using aryl halides, dialkyl azodicarboxylate, and a hydride source is reported. Using this procedure, aryl iodides reacted at ambient conditions, while aryl bromides required heating to 60 degrees C to accomplish the transformation. Various functional groups were tolerated under the optimum conditions. (C) 2015 Elsevier Ltd. All rights reserved.