Reactivity of 2-methylene-1,3-dicarbonyl compounds. 1,3-dipolar cycloaddition reaction with ethyl diazoacetate.
The reaction of 2-methylene-1,3-dicarbonyl compounds (1) with ethyl diazoacetate gave 4,5-dihydro-1H-pyrazole derivatives (2), which were stable for several months at room temperature in good yields.
Yamauchi
M
M
Faculty of Pharmaceutical Sciences, Josai University, Sakado, Saitama, Japan. yamauchi@josai.ac.jp
Yajima
M
M
D003500:Cyclization; D007202:Indicators and Reagents; D007659:Ketones / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008745:Methylation; D013237:Stereoisomerism
D007202:Indicators and Reagents; D007659:Ketones