Phosphoniosilylation of alpha,beta-enones with TBSOTf and triphenylphosphin
e at 0 degrees C affords 3-tert-butyldimethylsilyloxyalk-2-enylphosphonium
salts, which undergo facile nucleophilic substitution with various nucleoph
iles to give 3-substituted silyl enol ethers in good yields. (C) 1999 Elsev
ier Science Ltd. All rights reserved.