作者:Takashi Matsumoto、Sachihiko Imai、Masanori Mitsuki、Seiji Maeta
DOI:10.1246/bcsj.56.2981
日期:1983.10
The structure of anhydronellionol triacetate was revised to 11,12,16-triacetoxy-6-hydroxyabieta-5,8,11,13-tetraen-7-one (18) by the following syntheses. Acetylation of 16-acetoxyabieta-8,11,13-trien-12-ol, followed by oxidation with chromium trioxide, afforded 12,16-diacetoxyabieta-8,11,13-trien-7-one. This was converted into 6,12,16-triacetoxyabieta-5,8,11,13-tetraen-7-one (17) via 12,16-diacetoxyabieta-8,11,13-trien-6-one. Oxidation of 11,12,16-triacetoxyabieta-8,11,13-trien-6-one with Jones reagent gave 18, whose 1H NMR spectrum was in good agreement with that of natural anhydronellionol triacetate. 11,12,16-Triacetoxyabieta-5,8,11,13-tetraen-7-one (28) was also synthesized from 11,12,16-triacetoxyabieta-8,11,13-trien-7-one. The 1H NMR spectra of 17 and 28 were different from that of natural anhydronellionol triacetate. Since the revised structure 18 corresponds to dehydronellionol triacetate, the name of anhydronellionol should now be dropped from the list of natural diterpenes.
通过以下合成方法,三
乙酸酐基雌醇的结构被修正为 11,12,16-三乙酰氧基-6-羟基阿
松香-5,8,11,13-四烯-7-酮(18)。将 16-乙酰氧基阿
松香-8,11,13-
三烯-12-醇乙酰化,然后用
三氧化铬氧化,得到 12,16-
二乙酰氧基阿
松香-8,11,13-
三烯-7-酮。然后通过 12,16-
二乙酰氧基阿
松香-8,11,13-
三烯-6-酮转化为 6,12,16-三乙酰氧基阿
松香-5,8,11,13-四烯-7-酮(17)。用琼斯试剂氧化 11,12,16-三乙酰氧基阿
松香-8,11,13-
三烯-6-酮,可得到 18,其 1H NMR 光谱与天然无
水松香醇
三乙酸酯的 1H NMR 光谱十分吻合。11,12,16-三乙酰氧基阿
松香-5,8,11,13-四烯-7-酮(28)也是由 11,12,16-三乙酰氧基阿
松香-8,11,13-
三烯-7-酮合成的。17 和 28 的 1H NMR 光谱与天然无
水杨梅醇三乙酸酯不同。由于修订后的结构 18 与
三乙酸脱
水雪莲醇相对应,因此现在应将无
水雪莲醇从天然二萜列表中删除。