Functionalization of<i>trans</i>-Decalin. V. A Synthesis of (±)-Nootkatone and (±)-Valencene from 4β,4aβ-Dimethyl-<i>Δ</i><sup>6,7</sup>-octalin-1-one Ethylene Acetal
作者:Sigeru Torii、Tsutomu Inokuchi、Ko Handa
DOI:10.1246/bcsj.55.887
日期:1982.3
A synthesis of (±)-nootkatone (1) and (±)-valencene (18) starting from 4β,4aβ-dimethyl-Δ6,7-octalin-1-one ethylene acetal (2) is described. Epoxidation of the double bond of 2 followed by regiospecific reduction of the oxirane ring at the C-6 position gave the corresponding C-7 alcohol 4. Oxidation of 4 and subsequent methoxycarbonylation at the C-6 position afforded methyl 1,1-ethylenedioxy-4β,4a
描述了从 4β,4aβ-二甲基-Δ6,7-octalin-1-one 乙烯缩醛 (2) 开始合成 (±)-nootkatone (1) 和 (±)-valencene (18)。2 的双键环氧化,然后在 C-6 位对环氧乙烷环进行区域特异性还原,得到相应的 C-7 醇 4。4 的氧化和随后在 C-6 位的甲氧基羰基化得到甲基 1,1-亚乙基二氧基- 4β,4aβ-dimethyl-7-oxodecalin-6-carboxylate (6) 收率良好。通过用 NaBH4 还原然后脱水和随后在 PtO2 上氢化以及 6β-甲氧基羰基与 MeONa 差向异构化,将酮酯 6 转化为 1,1-乙二氧基-4β,4aβ-二甲基萘烷-6α-羧酸甲酯 (10b)甲醇。10b 脱缩醛,然后还原和脱水,得到 4β,4aβ-二甲基-Δ1(8a)-octalin-6α-羧酸甲酯 (15)。