Intramolecular Claisen-type condensations of β-acetoxy amides or imides
作者:Svante Brandänge、Hans Leijonmarck
DOI:10.1016/s0040-4039(00)79590-6
日期:1992.5
Intramolecular Claisen-type condensation of amide 1 or imide 7 leads to the same δ-lactone in racemic (2) or enantiomerically pure form (4) respectively. A side-reaction producing the 11-membered ring compound 6 makes imide 3 unsuitable as a starting material for the synthesis of 4. A clean two-step reduction of 4 to 9 is also described.