stereocentre. Quantum chemical calculations demonstrated that intramolecular general acid catalysis plays a key accelerating role through stabilization of developing charge in the transition state, and that the reaction is best described as a 5‐endo dig cyclization, rather than an anionic 6π electrocyclization. Investigations employing chiral phase‐transfer catalysts have given promising selectivities
生成从相转移条件下前体异
吡咯并pyridoindoline基序的级联反应进行说明。在季
铵催化剂和碱的存在下在室温下该转化进行到产生官能化的含全碳季立体中心产品。量子
化学计算表明,分子内一般酸催化起着关键通过在过渡态显影电荷的稳定化作用加速,并且反应最好是作为描述的5 - 内挖环化,而不是阴离子6πelectrocyclization。迄今为止,使用手性相转移催化剂的研究已经给出了有希望的选择性。