Superacidic cyclisation–lipase-mediated kinetic resolution as a short route from achiral linear isoprenoid alcohols to scalemic cyclic isomers
作者:Edward P. Serebryakov、Galina D. Gamalevich、Veacheslav N. Kulcitki、Nicon D. Ungur、Pavel F. Vlad
DOI:10.1070/mc2002v012n02abeh001566
日期:2002.1
(+/-)-alpha-Cyclogeraniol and (+/-)-drim-7-en-11-ol acetates obtained via the FSO3H-induced cyclisation of geraniol and (E)-farnesol and subsequent acetylation were hydrolysed in the presence of hog pancreas lipase (PPL) to afford (R)-(+)-alpha-cyclogeraniol (ee similar to30% at the optimal conversion C = 20+/-2%) and (5R,9R,10R)-(+)-drim-7-en-11-ol (ee 78.5% at C = 30%), respectively; (+/-)-15-acetoxy-isoagath-12-ene, obtained similarly from all-E-geranylgeraniol, is resistant to PPL-mediated hydrolysis, but is hydrolysed in the presence of lipase from Candida cylindracea to afford (10S,14R)-(-)-isoagath-12-en-15-ol of 69-80% ee in similar to3% yield.
(+/−)-α-环瑞香醇和(+/−)-7-降-11-醇乙酸酯通过发烟硫酸(FSO3H)诱导的茉莉醇和(E)-法尼醇的环化反应,随后经乙酰化制得;在猪胰脂酶(PPL)存在下水解,分别得到(R)-(+)-α-环瑞香醇(在最优转化率C = 20±2%时,ee ≈30%)和(5R,9R,10R)-(+)-7-降-11-醇(在C = 30%时,ee 为78.5%);而(+/-)-15-乙酸氧-异灰独木烯-12-烯,由全顺式-香叶基香叶醇类似制得,在PPL介导下对水解具有抗性,但在来自于Candida cylindracea的脂酶存在下水解,以≈3%的收率得到(10S,14R)-(-)-异灰独木烯-12-烯-15-醇,ee为69-80%。