Facile synthesis of pyrazoles via [3+2] cycloaddition of diazocarbonyl compounds and enones

A facile and efficient [3 + 2] cycloaddition reaction of diazocarbonyl compounds with enones has been achieved, which represents facile and straightforward access to pyrazoles in moderate to good yields. The present methodology is characterized by readily available starting materials, operational simplicity, and wide substrate scope. (C) 2020 Elsevier Ltd. All rights reserved.