作者:Sureshbabu Dadiboyena、Ashton T. Hamme
DOI:10.1016/j.tetlet.2011.03.004
日期:2011.5
synthesized through a tandem intramolecular cyclization/methylation reaction of a functionalized 5,5-disubstituted pyrazoline in one reaction vessel. The 5,5-pyrazolines were constructed through a 1,3-dipolar cycloaddition reaction of aromatic ring containing nitrile imines and a disubstituted geminal alkene. An evaluation of the relative location of the nucleophilic and electrophilic functional groups
在一个反应容器中,通过官能化 5,5-二取代吡唑啉的串联分子内环化/甲基化反应合成区域异构体螺吡唑啉。5,5-吡唑啉是通过含有腈亚胺的芳香环和双取代的孪生烯烃的1,3-偶极环加成反应构建的。对吡唑啉上亲核和亲电官能团的相对位置进行了评估,以确定用于分子内环化/甲基化反应的最佳吡唑啉系统。与具有直接键合的酯的吡唑啉相比,具有离吡唑啉更远的亲电酯的吡唑啉实现了更高的螺吡唑啉分离产率。