Condensed pyridazines. VII. Reaction of 7-(methylsulfonyl)-1-phenyl-1H-imidazo[4,5-d]pyridazine with nucleophiles.
作者:Etsuo OISHI、Akiya YAMADA、Eisaku HAYASHI、Ken-ichi TANJI、Akira MIYASHITA、Takeo HIGASHINO
DOI:10.1248/cpb.37.13
日期:——
The reaction of 7-(methylsulfonyl)- and 7-chloro-1-penyl-1H-imidazo[4, 5-d]pyridazines (1 and 2) with active methylene compounds (5a-d) or ketones (5e-g) in the presence of sodium hydrige gave the corresponding 7-substituted imidazopyridazines (6a-g). A similar substitution of both 1 and 2 with methoxide ion (8) gave the 7-methoxy-imidazopyridazine (9). However, 1 and 2 reacted with BuNH2 (10) in a different way from the above substitution, resulting in the formation of the corresponding ring fission products of the imidazole portion, 3-substituted 5-amino-4-anilinopyridazines (11 and 12, respectively). The reaction of 1 with alkylmagnesium halides (13a-d) gave the 4, 5- and 2, 3-adducts (III and IV) which were converted into the corresponding 4-alkyl- and 2-alkyl-imidazopyridazines (14a-d and 15a, b) by potassium ferricyanide oxidation. A [4+2] cycloaddition occurred in the reaction of 1 with 1-piperidinocyclopentene (16a) to give the tetrahydroindeno[5, 6-d]imidazoles 17 and 18.
7-(methylsulfonyl)- 和 7-chloro-1-penyl-1H-imidazo[4, 5-d]pyridazines (1 和 2) 与活性亚甲基化合物 (5a-d) 或酮 (5e-g) 在氢化钠存在下反应,得到相应的 7-取代咪唑并哒嗪 (6a-g)。用甲氧基离子(8)对 1 和 2 进行类似的取代,可以得到 7-甲氧基咪唑哒嗪(9)。不过,1 和 2 与 BuNH2(10)的反应方式与上述取代反应不同,形成了相应的咪唑部分环裂变产物,即 3-取代的 5-氨基-4-苯胺哒嗪(分别为 11 和 12)。1 与烷基卤化镁(13a-d)反应生成 4,5- 和 2,3-加合物(III 和 IV),这些加合物通过铁氰化钾氧化反应转化成相应的 4-烷基和 2-烷基咪唑并哒嗪(14a-d 和 15a,b)。1 与 1-哌啶环戊烯(16a)反应发生[4+2]环加成反应,得到四氢茚并[5, 6-d]咪唑 17 和 18。