A one-step preparation of 3,4-disubstituted β-lactones through Rh-catalyzed conjugate addition of aryl or alkenyl boronic acids to α-methylene-β-lactones is described. The operationally simple, stereoselective transformation provides a broad range of β-lactones from individual α-methylene-β-lactone templates. This methodology allowed for a direct, final-step C-3 diversification of nocardiolactone,
描述了一种通过Rh催化的芳基或烯基
硼酸到α-亚甲基-β-内酯的共轭加成反应,一步一步制备3,4-二取代的β-内酯的方法。操作简单,立体选择性转化可从各个α-亚甲基-β-内酯模板中提供广泛的β-内酯。这种方法可以使诺卡固内酯(一种抗菌天然产品)直接进行最后的C-3多元化生产。