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.
Sodium Borohydride-Nickel Chloride-Methanol Catalytic System for Regioselective Reduction of Electron-Rich Conjugated Dienes and Reductive Cleavage of Allyl Esters Involving π-Allylnickel Intermediates
The regioslective reduction of electron-rich dienes to monoolefins and the reductivecleavage of allyl esters were fulfilled by employing a sodium borohydride-nickel chloride-methanol catalytic system with exceedingly simple manipulations and high functional group tolerability. Both of the reductive reactions may involve π-allylnickel intermediates generated from fresh nickel boride.