Rhodium(III)‐catalyzed Intermolecular Unactivated Secondary C(
<i>sp</i>
<sup>3</sup>
)−H Bond Amidation Directed by 3,5‐dimethylpyrazole
作者:Yanwei Wang、Hongxin Liu、Bin Li、Baiquan Wang
DOI:10.1002/adsc.201801592
日期:2019.4
Rh(III)‐catalyzed intermolecular unactivated secondary C(sp3)−H bond amidation via nitrene insertion directed by 3,5‐dimethylpyrazole is reported. This procedure tolerates a broad substrate scope including chain and cyclic N‐alklyamides. Notably, the directing group 3,5‐dimethylpyrazole of chain N‐alkylamide substrates could be easily removed via cascade intermolecularamidation and intramolecular
A catalyst system for the formation of amides by reaction of carboxylic acids with blocked isocyanates
作者:R. Gertzmann、C. Gürtler
DOI:10.1016/j.tetlet.2005.07.156
日期:2005.9
A catalyst for the reaction of blocked isocyanates (blocking agent diisopropylamine and dimethyl pyrazole) and carboxylic acids was identified. Magnesium and in some instances calcium salts proved to be highly active as catalyst. This reaction gives amides in quantitative yield and excellent selectivity and is suitable for coating and general chemical purposes.