Synthesis of (−)-Morphine: Application of Sequential Claisen/Claisen Rearrangement of an Allylic Vicinal Diol
作者:Masato Ichiki、Hiroki Tanimoto、Shohei Miwa、Ryosuke Saito、Takaaki Sato、Noritaka Chida
DOI:10.1002/chem.201203284
日期:2013.1.2
were successfully differentiated during a subsequent Friedel–Crafts‐type cyclization. The (−)‐morphine double bond was introduced at a late stage in our first‐generation synthesis, but was formed at an earlier stage in the second‐generation synthesis, resulting in a more efficient route to the end product.
描述了基于顺序的[3,3]-σ重排合成(-)-吗啡的详细方法。烯丙基邻位二醇的连续的克莱森/克莱森重排在一次操作中导致两个连续碳中心的立体选择性形成,包括空间上受累的季碳。在随后的Friedel-Crafts型环化反应中,成功区分了该反应中生成的两种乙酯。(-)-吗啡双键是在第一代合成的后期引入的,但在第二代合成的较早阶段形成的,从而导致了通往最终产物的更有效途径。