Wittig and horner-wittig coupling reactions of 2-substituted cyclic ethers and their application to spiroketal synthesis
作者:Steven V Ley、Barry Lygo、Helen M. Organ、Anne Wonnacott
DOI:10.1016/s0040-4020(01)91403-6
日期:1985.1
Wittig and Horner-Wittig coupling reactions of tetrahydropyran or tetrahydrofuran 2-triphenylphosphonium salts or 2-diphenylphosphine oxides with aldehydes and lactols affords good yields of the corresponding enol ethers. In selected examples these enol ether products may be further converted to spiroketals some of which are natural pheromones derived from Dacus oleae and Paravespula vulgaris.
A versatile preparation of α-alkoxyphosphonium bromides leading to enolethers by Wittig coupling was exploited for the convergent synthesis of pheromones from the Douglas-fir tussock moth and the olive fly as well as an oxaspirolactone and C-glycoside.
A new route to spiro-ketals using the Horner-Wittig reaction of 2-diphenylphosphinoxy cyclic ethers
作者:Steven V. Ley、Barry Lygo
DOI:10.1016/s0040-4039(01)91163-3
日期:1984.1
Two insect pheromones along with other spiro-ketals have been synthesised by a newroute which involves Horner-Wittig coupling of 2-diphenylphosphinoxy cyclic ethers with aldehydes and lactols followed by acid catalysed cyclisation.