Photoinduced molecular transformations. Part 145. Regioselective [3 + 2] photoadditions of 2-hydroxyphenanthrene-1,4-dione with electron-rich alkenes and phenylacetylene: new one-step synthesis of 9,10-dihydrophenanthro[2,3-b]furan-7,11-diones and 2-phenylphenanthro[2,3-b]furan-7,11-dione
作者:Hiroshi Suginome、Hisato Kamekawa、Hideo Sakurai、Atsushi Konishi、Hisanori Senboku、Kazuhiro Kobayashi
DOI:10.1039/p19940000471
日期:——
regioselective [3 + 2] photoaddition in 25–50% yields. A [3 + 2] photoadduct, 9-phenylphenanthro[2,3-b]furan-7,11-dione, can be similarly formed in low yield when 2-hydroxyphenanthrene-1,4-dione and phenylacetylene in acetone are irradiated with Pyrex-filtered light. In contrast, the irradiation of 2-hydroxyphenanthrene-1,4-dione and alkenes such as methyl acrylate, acrylonitrile, cyclohexene, isopropenyl acetate
用丙酮酸滤过的光在丙酮中照射2-羟基菲-1、4-二酮和各种富电子的烯烃,例如乙基乙烯基醚,异丁烯,1-甲氧基环己烯和3,4-二氢-2 H-吡喃,得到9,10-二氢菲[2,3- b区域选择性[3 + 2]光加成反应产生的]呋喃-7,11-二酮,收率为25–50%。当用丙酮辐照2-羟基菲-1,4-二酮和苯乙炔时,可以以低收率类似地形成[3 + 2]光加合物9-苯基菲基[2,3-b]呋喃-7,11-二酮。耐热玻璃过滤光。相反,在丙酮中辐照2-羟基菲林-1,4-二酮和烯烃,例如丙烯酸甲酯,丙烯腈,环己烯,乙酸异丙烯酯,乙酸丙烯酯,乙酸乙烯酯,1-苯基丙-1-炔或三甲基甲硅烷基乙炔,仅得到二聚体。以42-52%的收率,没有形成[3 + 2]个光加合物。