DIANION OF<i>N</i>-(<i>o</i>-METHOXYPHENYL)-2-METHYLPROPENAMIDE: A NEW REAGENT FOR THE CONVENIENT SYNTHESIS OF α-METHYLENE-γ-BUTYROLACTONES FROM CARBONYL COMPOUNDS
Dianion of N-(o-methoxyphenyl)-2-methylpropenamide was successfully generated on treatment of the amide with t-BuOK–BuLi at −78°C in THF and utilized as the key reagent for the synthesis of γ-substituted α-methylene-γ-butyrolactones.