The Total Synthesis of (+)-Taxoquinone, (−)-7α-Acetoxyroyleanone, (−)-Dehydroroyleanone, (−)-Horminone, (−)-7-Oxoroyleanone, and (+)-Inuroyleanol
作者:Takashi Matsumoto、Shogo Harada
DOI:10.1246/bcsj.52.1459
日期:1979.5
Methylation of 12-benzoyloxyabieta-8,11,13-trien-11-ol with methyl iodide afforded 11-benzoyloxy-12-methoxyabieta- and 12-benzoyloxy-11-methoxyabieta-8,11,13-triene (9). Oxidation of the latter product with chromium trioxide, followed by sodium borohydride reduction and acetylation, gave 7β-acetoxy-12-benzoyloxy-11-methoxyabieta-8,11,13-triene (17) and its 7α-acetoxy isomer (18) in a ratio of ca. 5
12-benzoyloxyabieta-8,11,13-trien-11-ol 与甲基碘的甲基化得到 11-benzoyloxy-12-methoxyabieta-和 12-benzoyloxy-11-methoxyabieta-8,11,13-triene (9)。后一产物用三氧化铬氧化,然后硼氢化钠还原和乙酰化,得到 7β-乙酰氧基-12-苯甲酰氧基-11-甲氧基松香-8,11,13-三烯 (17) 及其 7α-乙酰氧基异构体 (18)大约的比率。5 : 1。另一方面,用四乙酸铅处理9产生比例为0.0.1的17和18。1:2。然后用三氧化铬氧化7β-乙酸酯(17),用氢氧化钠水溶液水解得到的对醌衍生物,得到紫杉醌(1),脱水得到脱氢乙酰基酮。类似地,7α-乙酸酯(18)通过对醌衍生物转化为激素(4),用碳酸氢钠水溶液处理,得到7α-乙酰氧基酰基酮。4 用二氧化锰氧化得到 7-氧代酰酮。1