Es wird die Synthese der 3‐methylenmonosubstituierten 2‐Oxo‐tetrahydrofurane 3a‐‐q aus den α‐Ketolactonen 1a,b und den Wittig‐Komponenten 2a‐‐h beschrieben.
Stereoselective synthesis of (Z )-α-(alkoxycarbonyl)methylene β- and γ-lactones by palladium-catalysed oxidative carbonylation of alkynols
作者:Bartolo Gabriele、Giuseppe Salerno、Francesca De Pascali、Mirco Costa、Gian Paolo Chiusoli
DOI:10.1039/a603892a
日期:——
(Z)-α-(Alkoxycarbonyl)methylene β- and
γ-lactones can be obtained in fair to excellent yields and with
high catalytic efficiencies by PdI2/KI-catalysed oxidative
dialkoxycarbonylation of propynyl alcohols (α,α-dialkyl
substituted, or α-monoalkyl substituted with a sufficiently bulky
alkyl group) and but-3-yn-1-ols, respectively. Reactions are carried out
in alcoholic media under mild conditions (70â80 °C and
20 atm of a 3â¶1 mixture of carbon monoxide and air). Reaction
pathways are discussed.