Fischer indolization and its related compounds. XV. Vilsmeier-Haack reaction of 1,2,3,4-tetrahydrocarbazole derivatives.
作者:YASUOKI MURAKAMI、HISASHI ISHII
DOI:10.1248/cpb.29.699
日期:——
Treatment of 6-chloro-1, 2, 3, 4-tetrahydrocarbazole (14) with the Vilsmeier-Haack reagent gave 6-chloro-2, 3, 4, 4a-tetrahydrocarbazole-4a, 9-dicarboxaldehyde (16) as a main product, along with 6-chloro-1, 2, 3, 4-tetrahydrocarbazole-9-carboxaldehyde (15) and 6-chloro-1, 2, 3, 4-tetrahydro-1-hydroxycarbazole-9-carboxaldehyde (17). The structures were established by spectral and chemical means. The mechanism of formation of 16 is discussed ; in connection with this, a similar reaction of 6-chloro-1, 2, 3, 4-tetrahydro-1, 1-dimethylcarbazole (37) was carried out and found to yield three products, 6-chloro-1, 2, 3, 4-tetrahydro-1, 1-dimethylcarbazole-9-(38), 5-(39), and 7-carboxaldehyde (40).
用 Vilsmeier-Haack 试剂处理 6-氯-1,2,3,4-四氢咔唑 (14),主要产物是 6-氯-2,3,4,4a-四氢咔唑-4a,9-二甲醛 (16)、以及 6-氯-1,2,3,4-四氢咔唑-9-甲醛(15)和 6-氯-1,2,3,4-四氢-1-羟基咔唑-9-甲醛(17)。这些化合物的结构是通过光谱和化学方法确定的。讨论了 16 的形成机理;与此相关,对 6-氯-1,2,3,4-四氢-1,1-二甲基咔唑 (37) 进行了类似的反应,发现生成了三种产物,即 6-氯-1,2,3,4-四氢-1,1-二甲基咔唑-9-(38)、5-(39) 和 7-甲醛 (40)。