Acid treatment in acetic anhydride of blocked cyclohexadienone derivatives (6a) and (6b) obtained from l-abietic acid (1) gave 14 and 16, respectively, through Wagner-Meer-wein rearrangement of the angular methyl group. On the other hand, under similar conditions, 6c and 6d were transformed into 18 and 20, respectively, as the result of an abnormal dienone phenol rearrangement, namely, aromatization of the B-ring with concomitant cleavage of C-C bond.
通过角甲基的 Wagner-Meer-wein 重排,从 l-
松香酸(1)中得到的受阻环
己二烯酮衍
生物(6a)和(6b)在
乙酸酐中进行酸处理,分别得到 14 和 16。另一方面,在类似条件下,6c 和 6d 分别转化为 18 和 20,这是异常二烯酮
酚重排的结果,即 B 环芳香化,同时 C-C 键断裂。