作者:Takashi Matsumoto、Hiroyuki Kawashima、Koji Iyo
DOI:10.1246/bcsj.55.1168
日期:1982.4
Hinokiol diacetate was converted into 3β-acetoxyabieta-8,11,13-triene-6β,12-diol via 3β,12-diacetoxyabieta-8,11,13-trien-7-one and 3β,12-diacetoxyabieta-6,8,11,13-tetraene. Oxidation of the 6β,12-diol with benzoyl peroxide produced 3β-acetoxy-12-benzoyloxyabieta-8,11,13-triene-6β,11-diol, which was converted into 3β,11,12-triacetoxyabieta-8,11,13-trien-6-one by lithium aluminium hydride reduction, acetylation, and Jones oxidation. Acidic hydrolysis of the triacetoxy ketone, followed by column chromatography on silica gel, afforded 3β-hydroxytaxodione. Oxidation of the 6β,11-diol with m-chloroperbenzoic acid afforded 3β-acetoxy-12-benzoyloxy-6β-hydroxyabieta-8,12-diene-11,14-dione. This was further converted into 3β,11,14-triacetoxy-12-benzoyloxyabieta-8,11,13-triene-6,7-dione by a series of reactions: Jones oxidation, reduction with zinc powder and dilute hydrochloric acid, acetylation, and Jones oxidation. Alkaline hydrolysis of the 6,7-dioxo compound afforded coleon T, which was isomerized to coleon S by refluxing with concentrated hydrochloric acid in methanol.
桧醇二乙酸酯通过3β,12-二乙酰氧基桧-8,11,13-三烯-7-酮和3β,12-二乙酰氧基桧-6,8,11,13-四烯转化为3β-乙酰氧基桧-8,11,13-三烯-6β,12-二醇。6β,12-二醇与过氧化苯甲酰发生氧化反应生成3β-乙酰氧基-12-苯甲酰氧基桧-8,11,13-三烯-6β,11-二醇,后者通过氢化铝锂还原、乙酰化和琼斯氧化反应转化为3β,11,12-三乙酰氧基桧-8,11,13-三烯-6-酮。三乙酰氧基酮经酸性水解后,在硅胶柱上进行色谱分离,得到3β-羟基紫杉二酮。6β,11-二醇与间氯过氧苯甲酸发生氧化反应生成3β-乙酰氧基-12-苯甲酰氧基-6β-羟基桧-8,12-二烯-11,14-二酮