Convenient Synthesis of Fluoroalkyl-Substituted Heterocycles from 1-Fluoroalkyl-2-iodoalkenes
作者:Hui-Ping Guan、Xiao-Qing Tang、Bing-Hao Luo、Chang-Ming Hu
DOI:10.1055/s-1997-1376
日期:1997.12
A convenient synthesis of fluoroalkyl-substituted heterocycles including 3-trifluoromethylpyrazoles 7, 5-trifluoromethylisoxazoles 8 and 4-trifluoromethylpyrimidines 9 is described. This two-step sequence consists of a radical addition of fluoroalkyl iodides 1 to alkynes 2 to afford the corresponding alkenes 3 and condensation of 3 with hydrazine, hydroxylamine or amidines to give the afore-mentioned heterocycles, respectively. A possible pathway is suggested.
描述了一种方便的合成含氟烷基取代的杂环化合物的方法,包括3-三氟甲基吡唑7、5-三氟甲基异恶烷8和4-三氟甲基嘧啶9。该两步反应序列包括氟烷基碘化物1与炔烃2的自由基加成,生成相应的烯烃3,以及3与肼、羟胺或酰胺的缩合反应,分别得到上述杂环化合物。提出了一种可能的反应路径。