作者:Lu Hao、Jun-Jie Hong、Jun Zhu、Zhuang-Ping Zhan
DOI:10.1002/chem.201204322
日期:2013.4.26
A one‐pot synthesis of 3,4,5‐ and 1,3,5‐pyrazoles from tertiary propargylic alcohols and para‐tolylsulfonohydrazide has been accomplished. The pyrazoles are formed through a four‐step cascade sequence, including FeCl3‐catalyzed propargylic substitution, aza‐Meyer–Schuster rearrangement, base‐mediated 6π electrocyclization, and thermal [1,5] sigmatropic shift. In this reaction, the 3,4,5‐ and 1,3,5‐pyrazoles
由叔炔丙基醇和对甲苯磺酰肼进行的一锅法合成3,4,5-和1,3,5-吡唑已经完成。吡唑是通过四个步骤的级联序列形成的,包括FeCl 3催化的炔丙基取代,aza-Meyer-Schuster重排,碱基介导的6π电环化和热[1,5]σ迁移。在该反应中,根据起始醇中的不同取代基选择性地生产了3,4,5-和1,3,5-吡唑。