One-Pot, Three-Component Approach to the Synthesis of 3,4,5-Trisubstituted Pyrazoles
作者:Ahmed Kamal、K. N. Visweswara Sastry、D. Chandrasekhar、Geeta Sai Mani、Praveen Reddy Adiyala、Jagadeesh Babu Nanubolu、Kiran Kumar Singarapu、Ram Awatar Maurya
DOI:10.1021/jo502946g
日期:2015.5.1
high yielding protocol for the synthesis of polyfunctional pyrazoles has been developed through one-pot, three-componentcoupling of aldehydes, 1,3-dicarbonyls, and diazo compounds as well as tosyl hydrazones. The reaction proceeds through a tandem Knoevenagel condensation, 1,3-dipolar cycloaddition, and transition metal-free oxidative aromatization reaction sequence utilizing molecular oxygen as a
Facile synthesis of pyrazoles via [3 + 2] cycloaddition of diazocarbonyl compounds and enones
作者:Guipeng Feng、Shaohong Xu、Rongxiang Chen、Wenyan Chen、Kai-Kai Wang、Shaoyan Wang
DOI:10.1016/j.tetlet.2020.152622
日期:2020.12
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.