Yield and selectivity enhancement by trimethylsilyl chloride in the conjugate addition of stabilized organolithiums
作者:Hong Liu、Theodore Cohen
DOI:10.1016/0040-4039(95)01919-9
日期:1995.12
The yield and selectivity in the conjugateaddition of some stabilizedorganolithiums to α,β-unsaturated carbonyl compounds, especially easily polymerized ones, are increased in the presence of trimethylsilylchloride, alone or in combination with hexamethylphosphoric triamide. E-silyl enol ethers bearing the versatile phenylthio group are obtained prior to hydrolysis. Some synthetic uses are demonstrated
Asymmetric synthesis of carbocycles: use of intramolecular conjugate displacement
作者:Dinesh T. Sreedharan、Derrick L. J. Clive
DOI:10.1039/c3ob40115d
日期:——
Intramolecularconjugatedisplacement (ICD), the process illustrated in eqn (1), has been applied to the Morita–Baylis–Hillman adducts formed from (5S)-5-(L-menthyloxy)-2(5H)-furanone and aldehydes that are substituted in the γ- or δ-position by geminal phenylthio groups. When the initial Morita–Baylis–Hillman alcohols are acetylated and oxidized to geminal sulfones, deprotonation causes ring closure