REISCH, J.;MESTER, Z., MONATSH. CHEM., 1983, 114, N 5, 635-637
作者:REISCH, J.、MESTER, Z.
DOI:——
日期:——
Stereoselective synthesis of freelingyne and related γ-alkylidenebutenolides via vinylogous Mukaiyama aldol additions
作者:Frank von der Ohe、Reinhard Brückner
DOI:10.1039/b002903n
日期:——
Following the strategy of Scheme 1, a Mukaiyama aldoladdition/anti-elimination route to stereopure γ-alkylidenebutenolides 4 was established. The addition giving 27 was only moderately diastereoselective but the products lk- and ul-27 were chromatographically separable (Scheme 4). They underwent highly selective anti-eliminations in the presence of triflic anhydride–pyridine or Burgess' reagent, furnishing