New Heterocyclic Precursors for Thermal Generation of Reactive, Electron-Rich 1,2-Diaza-1,3-butadienes
作者:Robert K. Boeckman、Ping Ge、Jessica E. Reed
DOI:10.1021/ol025587w
日期:2002.5.1
A Novel Route to 2,3-Pyrazol-1(5<i>H</i>)-ones via Palladium-Catalyzed Carbonylation of 1,2-Diaza-1,3-butadienes
作者:Robert K. Boeckman,、Jessica E. Reed、Ping Ge
DOI:10.1021/ol016565x
日期:2001.11.1
[GRAPHICS]A novel Pd(0)-catalyzed carbonylation of both isolable 1,2-diaza-1,3-butadienes and those generated in situ by extrusion of SO2 and CO2 from heterocyclic precursors is described. The reaction proceeds at room temperature to 110 degreesC under 1-2 atm of CO to afford 2,3-pyrazol-1(5H)-ones in good to excellent yields. The effect of catalyst structure and stability on the carbonylation reaction is evaluated.