Reactivity of Cross-Conjugated Enynones in Cyclocondensations with Hydrazines: Synthesis of Pyrazoles and Pyrazolines
作者:Alexander A. Golovanov、Ivan S. Odin、Dmitry M. Gusev、Anna V. Vologzhanina、Ilya M. Sosnin、Stanislav A. Grabovskiy
DOI:10.1021/acs.joc.1c00569
日期:2021.5.21
arylhydrazines leads to the regioselectivesynthesis of pyrazole derivatives (dihetaryl-substituted ethens, buta-1,3-diens, and hexa-1,3,5-triens) or results in 4,5-dihydro-1H-pyrazoles in good yield. The reaction path is controlled by the character of the substituent in enynone: the pyrazoles are obtained from the reaction of substrates that contain five-membered heteroaromatic substituents with arylhydrazines