作者:Youssef L. Bennani
DOI:10.1002/jlcr.2580360807
日期:1995.8
1-[13CD3]-9-cis-Retinoic acid was prepared in 8 steps from 2,6-dimethylcyclohexanone. Alkylation of 2,6-dimethylcyclohexanone under LiHMDS/MnBr2/13CD3I gave the corresponding labeled 2-[13CD3]-2,2,6-trimethylcyclohexanone 4 in good yield. Further functionalization of 4 to 6-[13CD3]-β-cyclocitral 6 proceeded through a Shapiro reaction. Aldehyde 6 was condensed with ethyl 3,3-dimethylacrylate to afford the corresponding bicyclic pyranone 7. Reduction of 7 to lactol 8, followed by acid-catalyzed ring opening gave the 9-cis-aldehyde 9. Wittig-Horner olefination and saponification afforded the title compound in good overall yield and in excellent isotopic purity.
1-[13CD3]-9-cis-Retinoic acid 由 2,6-二甲基环己酮经 8 个步骤制备而成。在 LiHMDS/MnBr2/13CD3I 条件下,2,6-二甲基环己酮发生烷基化反应,得到相应的标记 2-[13CD3]-2,2,6-三甲基环己酮 4,收率良好。通过 Shapiro 反应,4 进一步官能化为 6-[13CD3]-β-环柠檬醛 6。醛 6 与 3,3-二甲基丙烯酸乙酯缩合,得到相应的双环吡喃酮 7。将 7 还原成内酯 8,然后在酸催化下开环,得到 9-顺式醛 9。Wittig-Horner 烯化和皂化反应得到了标题化合物,总收率高,同位素纯度极佳。