Starting from citraconic anhydride, a three-step approach to fimbrolide congener is reported by taking the advantage of a regioselective Grignard reaction with an anhydride, followed by a dehydrative cyclization and double bromination-dehydrobromination sequence. Starting from N-(4-tolyl)maleimide, an eight-step synthesis of two natural fimbrolides is reported with good yields via the synthesis of requisite butylmaleic anhydride, its regioselective Grignard coupling reaction, and a bromination-dehydrobromination pathway.
报告以
柠檬酸酐为起点,利用酸酐的区域选择性格氏反应的优势,通过脱
水环化和双
溴化-氢
溴化顺序,分三步合成了芬布内酯同系物。从 N-(4-
甲苯基)马来
酰亚胺开始,通过合成所需的丁基
马来酸酐、其区域选择性格氏偶联反应和
溴化脱氢
溴化途径,报告了八步合成两种天然芬布内酯的方法,并获得了良好的产率。