An efficientsynthesis of unsymmetrically substituted 1,3-pyrazole derivatives has been developed via three-component coupling reaction involving 3-(dimethylamino)-1-phenylprop-2-en-1-one, hydrazine, and aryl halides in onepot process exhibiting high regioselectivity. The pyrazole synthesis proceeds via a sequential series of reactions such as Michael addition, heterocyclization, dehydration, and
Primary Vinyl Ethers as Acetylene Surrogate: A Flexible Tool for Deuterium-Labeled Pyrazole Synthesis
作者:Maria S. Ledovskaya、Vladimir V. Voronin、Mikhail V. Polynski、Andrey N. Lebedev、Valentine P. Ananikov
DOI:10.1002/ejoc.202000674
日期:2020.8.9
A novel synthetic path to 1,3‐disubstituted pyrazoles, 4,5‐dideuteropyrazoles and 5‐deuteropyrazoles based on the interaction of the readily available vinyl ethers and in situ generated nitrile imines was developed. The joint experimental and computational study clarified the mechanism of the process and allowed us to propose a convenient access to regioselectively deuterated pyrazoles.