The Thermal Reaction of 3-Benzoylguaiazulene and Methyl Guaiazulene-3-carboxylate
作者:Shinji Kurokawa、Mamoru Hashimoto、Shûichi Hayashi
DOI:10.1246/bcsj.45.3559
日期:1972.12
3-Benzoylguaiazulene (I) and methyl guaiazulene-3-carboxylate (XI) were heated at 250–260°C. From 3-benzoylguaiazulene we obtained, besides S-guaiazulene (II), three new azulenoids, which were established to be 2-benzoylguaiazulene (III), 1-benzoyl-7-isopropyl-3,4-dimethylazulene (IVa) and 2-benzylguaiazulene (V). On the other hand, the products yielded from methyl guaiazulene-3-carboxylate, together with S-guaiazulene, were elucidated to be methyl 7-isopropyl-3,4-dimethylazulene-1-carboxylate (XII) and methyl guaiazulene-2-carboxylate (XIII). In addition to the loss and the migration of the acyl group, the exchange of acyl and methyl groups in the five-membered ring took place in both acylguaiazulenes, as well as in the case of 3-acetylguaiazulene reported earlier. Moreover, the reduction of the acyl group was also observed in 3-benzoylguaiazulene.
将 3-苯甲酰愈创蓝油烯 (I) 和愈创蓝油烯-3-甲酸甲酯 (XI) 在 250–260°C 下加热。从 3-苯甲酰愈创蓝油烯中,除了 S-愈创蓝油烯 (II) 之外,我们还获得了三种新的薁环烃,它们被确定为 2-苯甲酰愈创蓝油烯 (III)、1-苯甲酰基-7-异丙基-3,4-二甲基薁油烯 (IVa) 和 2-苄基愈创蓝油烯 (V)。另一方面,由愈创蓝油烯-3-甲酸甲酯和S-愈创蓝油烯生成的产物被阐明为7-异丙基-3,4-二甲基薁油烯-1-甲酸甲酯(XII)和愈创蓝油烯-2-甲酸甲酯(十三)。除了酰基的丢失和迁移之外,在酰基愈创蓝烯以及之前报道的3-乙酰基愈创蓝烯中,五元环中的酰基和甲基也发生了交换。此外,在3-苯甲酰基愈创蓝油烯中也观察到酰基的减少。