Catalysed cross-coupling of butenolide-3-triflates to 9-alkyl-9-borobicyclo[3.3.1]nonanes occurs in moderate to good yield and tolerates a range of functionality. Application of this methodology combined with addition of diethylzinc to a butenolide aldehyde in the presence of an ephedrine derivative leads to a 3-step synthesis of (−)-isoseiridine with 88%e.e. in good yield.
Pd(O)催化的
丁烯内酯-3-
三氟甲磺酸酯到9-烷基-
9-硼双环[3.3.1]壬烷的交叉偶联反应具有中等至良好的收率,并具有一定的功能范围。该方法的应用与在
麻黄碱衍
生物存在下将
二乙基锌加到
丁烯醛中的方法相结合,可实现收率达88%ee的(-)-异
水苏啶的3步合成。