PdCl2(PhCN)2–SnCl2, bis(1,5-cyclooctadiene)nickel(0) [Ni(cod)2]/PPh3–Zn, NiBr2(PPh3)2–Zn, or Pd(OAc)2/PPh3–Zn catalytic systems induced aldol-type condensation of isopropenyl acetate with aldehydes to produce 4-substituted (E)-3-buten-2-ones. PdCl2(PhCN)2–SnCl2 was utilized in the aldol-type reaction with any arenecarbaldehyde, bearing either an electron-donating group or an electron-withdrawing group
Palladium-catalyzed aldol-type condensation by enol esters with SnCl2
作者:Yoshiro Masuyama、Tatsuya Sakai、Yasuhiko Kurusu
DOI:10.1016/s0040-4039(00)61644-1
日期:1993.1
Using PdCl2(PhCN)2-SnCl2, enol esters caused aldol-typecondensation with aldehydes at 50°C in acetonitrile to produce (E)-α,β-unsaturated carbonyl compounds. Cyclic enol ester such as α-angelicalactone also reacted with aldehydes under the same conditions to afford γ-substituted β-acetyle-γ-butyrolactones and/or 5-substituted 4-acetyl-2(5H)-furanones.