(4S, 5S, 8S, 9S)- and (4R, 5S, 8S, 9S)-9-hydroxy-5,8-epoxy-henicosabutanolides 3b and 4b, respectively, have been successfully synthesized from very inexpensive L-glutamic acid. The key step of the synthetic sequence is an alkylation of lactol acetates 5a,b with 2-(trimethylsilyloxy)-furan. Stereochemical relationship assignment of the obtained products were deduced from NMR data, and by chemical correlation
(4S,5S,8S,9S)-和(4R,5S,8S,9S)-9-羟基-5,8-环氧-丁香醇3b和4b已分别由非常便宜的
L-谷氨酸成功合成。合成序列的关键步骤是将
乙酸内酯
乙酸酯5a,b与2-(三甲基甲
硅烷氧基)-
呋喃进行烷基化。从NMR数据和通过
化学相关推导获得的产物的立体
化学关系分配。