The generation of FSO2 radicals underelectrochemical conditions is reported. Various sulfonylfluorides and heterocycles, including a novel oxathiazole dioxide heterocycle, can be obtained in good to excellent yields. Some β-keto sulfonylfluorides and derivatives showed potent activities against Bursaphelenchus xylophilus and Colletotrichum gloeosporioides.
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.
Heterocycloaddition of thermally generated 1,2-diaza-1,3-butadienes to [60]fullerene
Stable C-60-fused tetrahydropitridazine derivatives were synthesized through the hetero-Diels-Alder cycloaddition of C-60 with 1,2-diaza-1,3-butadienes, which were generated in situ by the thermal extrusion of sulfur dioxide from 2,5-dihydro-1,2,3-thiadiazole- 1,1-dioxides. (c) 2006 Elsevier Ltd. All rights reserved.
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/ol0165645
日期:2001.11.1
[reaction--see text] [corrected] The preparation and thermolysis of new stable heterocyclic precursors of 1,2-diaza-1,3-butadienes is described. The resulting reactive diazadienes are trapped in situ with N-phenylmaleimide [corrected]. The effect of precursor structure on the temperature at which the diazadienes are generated is discussed.