Concerning the Selective Protection of (Z)-1,5-syn-Ene-diols and (E)-1,5-anti-Ene-diols as Allylic Triethylsilyl Ethers
摘要:
Treatment of unsaturated 1,5-diols 2 with TES-CI (1.1 equiv), imidazole, and catalytic DMAP in 1:1 CH2Cl2-DMF at -78 degrees C effects selective silylation of the allylic alcohol with > 95:5 chemoselectivity when the allylic and homoallylic alcohols are in similar steric environments.