Aromatic substitution in dehydroabietane derivatives. Syntheses of the phenolic dehydroabietane series.
作者:HIROYUKI AKITA、TAKESHI OISHI
DOI:10.1248/cpb.29.1567
日期:——
In order to investigate the relationship between the position of the hydroxy group on the aromatic C-ring of dehydroabietane and the cleavage pattern upon ozonolysis, phenolic dehydroabietane derivatives having a hydroxyl group on every possible position (11-, 12-, 13-, and 14-positions) were synthesized from dehydroabietic acid (2). Friedel-Crafts acetylation of dehydroabietane (7) derived from 2 gave the 12-acetyl compound (8), which was converted to the 12-hydroxy compound (ferruginol, 10) and 11, 12-dihydroxy dehydroabietane (14). On the other hand, nitration of 7-oxo dehydroabietane (25) afforded a mixture of the 14-nitro-7-oxo compound (26) and the 13-nitro-7-oxo compound (27) in ca. 1 : 1 ratio. The former (26) was converted into 14-hydroxy dehydroabietane (32) and the latter (27) was led to both the 13-hydroxy compound (37) and the 13, 14-dihydroxy compound (47).
为了研究脱氢枞烷芳族C环上羟基的位置与臭氧分解时裂解模式之间的关系,在每个可能的位置(11-、12-、13-和14位)由脱氢松香酸(2)合成。对源自 2 的脱氢松香烷 (7) 进行弗里德尔-克来福特乙酰化,得到 12-乙酰基化合物 (8),将其转化为 12-羟基化合物 (ferruginol, 10) 和 11, 12-二羟基脱氢松香烷 (14)。另一方面,7-氧代脱氢松香烷(25)的硝化得到约14-硝基-7-氧代化合物(26)和13-硝基-7-氧代化合物(27)的混合物。 1:1 比例。前者(26)转化为14-羟基脱氢松香烷(32),而后者(27)则产生13-羟基化合物(37)和13, 14-二羟基化合物(47)。