Construction of Morphan Derivatives by Nitroso-Ene Cyclization: Mechanistic Insight and Total Synthesis of (±)-Kopsone
作者:Li Zhai、Xuechao Tian、Chao Wang、Qi Cui、Wenhua Li、Sha-Hua Huang、Zhi-Xiang Yu、Ran Hong
DOI:10.1002/anie.201706018
日期:2017.9.11
morphan derivatives with good functional‐group tolerance. DFT calculations revealed that the nitroso–ene reaction proceeds in a stepwise manner involving diradical or zwitterionic intermediates. The rate‐determining step is C−N bond formation, followed by a rapid hydrogen‐transfer step with a chair‐conformation transition state. The current approach was also successfully applied in the first total synthesis
开发了II型亚硝基环化反应用于构建具有良好官能团耐受性的吗啡衍生物。DFT计算表明,亚硝基-烯反应以逐步的方式进行,涉及双自由基或两性离子中间体。决定速率的步骤是CN键的形成,然后是快速的氢转移步骤,具有椅子构象的过渡态。目前的方法还成功地用于(±)-kopsone的首次全合成,这是一种从大果菊中分离出的高度紧张而简单的吗啡型生物碱。