Synthesis of α-Methylene-γ-lactone Fused to Seven, Eight, and Fourteen-membered Carbocycle through Intramolecular Cyclization of Functionalized Allylsilane with Acid Chloride
作者:Chiaki Kuroda、Shuzo Anzai
DOI:10.1246/cl.1998.875
日期:1998.9
α-Methylene-γ-lactone fused to cycloheptane ring was synthesized by intramolecularcyclization of 8-(ethoxycarbonyl)- or 8-(acetoxymethyl)-9-(trimethylsilyl)non-7-enoyl chloride followed by lactonization. α-Methylene-γ-lactone fused to cyclooctane and cyclotetradecane ring were also synthesized from 9-(acetoxymethyl)-10-(trimethylsilyl)dec-8-enoyl chloride and 15-(acetoxymethyl)-16-(trimethylsilyl)hexadec-14-enoyl
α-Methylene γ -lactone fused to seven-membered carbocycle was synthesized by intramolecularcyclization of (2-ethoxycarbonylallyl)trimethylsilane or (2-acetoxymethylallyl)trimethylsilane with acidchloride. The former was found to be a better way for seven-membered carbocyclization, while the latter method was applicable to the synthesis of α- methylene γ -lactones fused to eight- and fourteen-membered carbocycles