作者:Masaaki Honda、Kimiaki Imafuku
DOI:10.1246/bcsj.58.508
日期:1985.2
3-[3-(2-Furyl)-2-propenoyl]- (2a), 3-[3-(2-thienyl)-2-propenoyl]- (2b), 3-[3-(3-thienyl)-2-propenoyl]- (2c), and 3-[3-(3-pyridyl)-2-propenoyl]tropolone (2d) were prepared by the condensation of 3-acetyltropolone with the corresponding heterocyclic aldehydes. The compounds 2a–d were oxidized with selenium dioxide to afford 2-heterocycle-substituted cyclohepta[b]pyran-4,9-diones, while oxidation with both alkaline hydrogen peroxide and 2,3-dichloro-5,6-dicyano-p-benzoquinone gave 2-(heterocycle-substituted methylene)-2H-cyclohepta[b]furan-3,8-diones.
3-[3-(2-呋喃基)-2-丙烯酰]-(2a)、3-[3-(2-噻吩基)-2-丙烯酰]-(2b)、3-[3-(3-噻吩基)-2-丙烯酰]-(2c)和3-[3-(3-吡啶基)-2-丙烯酰]特罗波酮(2d)是通过3-乙酰特罗波酮与相应的杂环醛凝缩反应制备的。化合物2a-d与二氧化硒氧化反应,得到2-杂环取代环七烯-4,9-二酮,而与碱性过氧化氢和2,3-二氯-5,6-二氰基-p-喹啉醌共同氧化则生成2-(杂环取代亚甲基)-2H-环七烯-3,8-二酮。