The benzannalated cycl [3. 2. 2] azine, benzo [g] cycl [3. 2. 2] azine (2), was synthesized from 2-methylthiopyrrolo [2, 1-a] isoquinoline (5) and dimethyl acetylenedicarboxylate. The key intermediate (5) for the synthesis of 2 was prepared using the reaction of isoquinolinium ketene dithioacetal (8) with nitromethane in good yields. Compound 8 was obtained using the reaction of 2-ethoxycarbonylmethylisoquinolinium bromide (6) with carbon disulfide and dimethyl sulfate in the presence of sodium hydroxide followed by methylation with methyl iodide.
苯并环[3.2.2]吖嗪,苯并[g]环[3.2.2]吖嗪(2)由2-甲基
硫代
吡咯并[2,1-a]
异喹啉(5)和
乙炔二
羧酸二甲酯合成。合成2的关键中间体(5)是通过
异喹啉酮二
硫代
缩醛(8)与
硝基甲烷反应制备的,收率较高。化合物8是通过2-乙氧羰基甲基
异喹啉溴化物(6)与
二硫化碳和
硫酸二甲酯在
氢氧化钠存在下反应,然后用甲基
碘甲基化得到的。