A new method has been developed for the stereoselectiveconstruction of the ABrings of the quinolizidine skeleton of matrine-type alkaloids with a cis-cis stereochemistry. The key features of this method involve: (i) construction of the quinolizidine by reduction of an acylpyridinium cation; and (ii) late-stage introduction of methoxypyridine by sequential Stille coupling and diastereoselective
开发了一种立体选择性构建苦参碱型生物碱喹啉齐啶骨架 AB 环的新方法,具有顺-顺立体化学。该方法的主要特征包括:(i)通过还原酰基吡啶阳离子构建喹啉;(ii)通过顺序Stille偶联和非对映选择性氢化反应后期引入甲氧基吡啶。