Heterofulvalenes. II. Synthesis and Reaction of 2,3 : 7,8-Dibenzo-1,4-dithia-6-azafulvalene
作者:Juzo Nakayama、Mimiko Imura、Masamatsu Hoshino
DOI:10.1246/bcsj.53.1661
日期:1980.6
Reaction of 2-isopentyloxy-1,3-benzodithiole with indole in acetic acid gave a 93% yield of 3-(1,3-benzodithiol-2-yl)indole (4a) which was converted to 2-(3-indolyl)-1,3-benzodithiolylium tetrafluoroborate (5a) in a 77% yield by treatment with trityl tetrafluoroborate. 5a was also prepared by reaction of indole with 2 molar amounts of 1,3-benzodithiolylium tetrafluoroborate. Treatment of 5a with triethylamine afforded the title compound 6a in 93% yield. 6a was protonated, methylated, and benzoylated at its 6-position by tetrafluoroboric acid, methyl iodide, and benzoyl chloride, respectively. Reaction of 6a with dimethyl acetylenedicarboxylate gave a 1,6-dipolar intermediate which was trapped as an adduct with ethanol. 6a was smoothly reduced by sodium borohydride to give its 5,6-dihydro derivative.
2-isopentyloxy-1,3-benzodithiole 与吲哚在乙酸中反应,得到 93% 产率的 3-(1,3-苯并二硫醇-2-基)吲哚 (4a),用四氟硼酸三甲苯酯处理后,可转化为 2-(3-吲哚基)-1,3-苯并二硫醇四氟硼酸盐 (5a),产率为 77%。5a 也是通过吲哚与 2 摩尔量的 1,3-苯并二硫鎓四氟硼酸盐反应制备的。用三乙胺处理 5a 后得到标题化合物 6a,收率为 93%。6a 的 6 位分别被四氟硼酸、碘甲烷和苯甲酰氯质子化、甲基化和苯甲酰化。6a 与乙炔二甲酸二甲酯反应生成 1,6-二极中间体,该中间体与乙醇发生加成反应。6a 被硼氢化钠顺利还原,得到其 5,6-二氢衍生物。