Reactions of 3-Isopropenyl- and 3-Acetyltropolone with Quarternary Ammonium Tribromides
作者:Yoichiro Matsunaga、Kimiaki Imafuku
DOI:10.1246/bcsj.65.295
日期:1992.1
Treatments of 3-isopropenyltropolone with quarternary ammonium tribromides in tetrahydrofuran afforded 3-methyl-8H-cyclohepta[b]furan-8-one. The reactions in methanol–dichloromethane gave 7-bromo-3-methyl-8H-cyclohepta[b]furan-8-one. Bromination of 3-acetyltropolone with the tribromides in tetrahydrofuran produced 3-(bromoacetyl)tropolone, while the reaction in the methanolic solvent gave 7-bromo- and 5,7-dibromo-substituted 3-acetyltropolones. The brominations of 4′-hydroxyacetophenone were also carried out.
Zhang, Luo-Cheng; Imafuku, Kimiaki, Journal of Heterocyclic Chemistry, 1991, vol. 28, # 3, p. 717 - 720
作者:Zhang, Luo-Cheng、Imafuku, Kimiaki
DOI:——
日期:——
Synthesis of 5,7-Dibromotropono[c]pyrazole Derivatives
作者:Wentao Gao、Yang Li
DOI:10.3987/com-10-12045
日期:——
A facile synthesis of some novel 5,7-dibromotropono[c]pyrazole derivatives via the condensation reaction of 3-acetyl-5,7-dibromotropolone with aromatic hydrazines is described. All the synthesized compounds were obtained in good yields of 67-88% and their structures were characterized by IR, H-1 NMR, MS, and elemental analysis.
LI, ZHI-HONG;JIN, ZHONG-TIAN;YIN, BING-ZHU;IMAFUKU, KIMIAKI, J. HETEROCYCL. CHEM., 24,(1987) N 3, 779-783