Dihydro-4,4-dimethyl-2,3-furandione (4e) was synthesized from diethyl oxalate, methylpropanal (1a) and formaldehyde in the presence of sodium methoxide. In a similar manner, analogs of dihydro-2,3-furandione 4 were prepared using other aldehydes.
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.