Intramolecular Cyclization of (2-Functionalized Allyl)trimethylsilane with Acid Chloride. Synthesis of Two Guaianolide-Type α-Methylene γ-Lactones
作者:Chiaki Kuroda、Kenichi Kobayashi、Akira Koito、Shuzo Anzai
DOI:10.1246/bcsj.74.1947
日期:2001.10
α-Methylene γ -lactone fused to seven-membered carbocycle was synthesized by intramolecular cyclization of (2-ethoxycarbonylallyl)trimethylsilane or (2-acetoxymethylallyl)trimethylsilane with acid chloride. 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
通过(2-乙氧基羰基烯丙基)三甲基硅烷或(2-乙酰氧基甲基烯丙基)三甲基硅烷与酰氯的分子内环化合成了与七元碳环稠合的α-亚甲基γ-内酯。发现前者是七元碳环化的更好方法,而后一种方法适用于与八元和十四元碳环稠合的α-亚甲基γ-内酯的合成。该方法合成了愈创甘油醚-8,12-和6,12-内酯类化合物,其中环化反应立体选择性地进行。还发现(Z)-和(E)-烯丙基硅烷都提供与主要产物相同的立体异构体。