作者:Meng Tang、Wen Zhang、Yuanfang Kong
DOI:10.1039/c3ob41435c
日期:——
An efficient synthesis of pyrazoles from tosylhydrazones and nitroalkenes was developed. In comparison with the previously reported 1,3-dipolar cycloaddition reaction of diazo compounds with electron-deficient alkenes or alkynes, this methodology proceeded with a sequential Baylis–Hillman/intramolecular cyclization mechanism and a variety of reversed regioselectivity products were prepared in good
开发了由甲苯磺酰hydr和硝基烯烃有效合成吡唑的方法。与先前报道的重氮化合物与缺电子的烯烃或炔烃进行的1,3-偶极环加成反应相比,该方法采用了依次的Baylis-Hillman /分子内环化机理,并制备了许多反向的区域选择性产物,收率很高。