作者:J.J. Burger、T.B.R.A. Chen、E.R. de Waard、H.O. Huisman
DOI:10.1016/s0040-4020(01)92030-7
日期:1981.1
technique. The head-to-tail and tail-to-tail coupled isoprenoid mixtures 5–8 and 18–21, respectively, are isomerized to 2E/Z, 4E-mixtures in a 2:1 ratio. The C15-sulfones 11 and 13 are obtained by treatment of 1 with the head-functionalized isoprene synthon 10. Some speculations on the stereochemical course of the MIRB-homologation are presented.
在DMSO中用苯磺酸钠处理砜1或2可获得头到尾偶联的共轭单萜5-8。3的相应反应给出异构体16和17。的尾对尾同系4种配料2:10 2 ë,4 E / Z共轭类异戊二烯-混合物18和19。各种类异戊二烯混合物被分离成组分,异构体的构型由1确定1 H NMR双共振和NMR / NOE技术。头对尾和尾对尾偶联的类异戊二烯混合物5-8和18-21分别以2:1的比例异构化为2 E / Z和4 E混合物。通过用头部官能化的异戊二烯合成子10处理1获得C 15砜11和13。提出了一些关于MIRB同源立体化学过程的推测。