When 3-acetylguaiazulene was heated with sulfur at 200°C, three new azulenoids were obtained, in addition to the S-guaiazulene formed by the loss of the acetyl group; the structures were established as 2-acetylguaiazulene, 6-acetyl-, and 7-acetyl-3,5,8-trimethylazuleno [6,5-b] thiophenes. From the experimental results it became obvious that a sulfur atom linked one methyl carbon atom of the isopropyl group with the C6-azulene-ring carbon atom in 3-acetylguaiazulene, resulting in the formation of a thiophene ring, and also that the loss and the migration of the acetyl group took place in 3-acetylguaiazulene as well. The acetyl migration in this compound was ascertained to be a simple thermal reaction and to occur in one direction, from C3 to C2.
当 3-乙酰基guaiazulene与
硫在 200°C 下加热时,除了失去乙酰基形成的 S-guaiazulene外,还得到了三种新的类薁;其结构被确定为 2-乙酰基guaiazulene、6-乙酰基和 7-乙酰基-3,5,8-三甲基薁并[6,5-b]
噻吩。实验结果表明,在 3-乙酰基guaiazulene 中,一个
硫原子将异丙基的一个甲基碳原子与 C6-azulene-ring 碳原子连接起来,从而形成了一个
噻吩环,而且乙酰基的消失和迁移也发生在 3-乙酰基guaiazulene 中。这种化合物中乙酰基的迁移被证实是一种简单的热反应,而且是单向发生的,即从 C3 到 C2。