Quaternization of Pyrazine, Pyridazine, and Pyrimidine with Alkyl and Polyfluoroalkyl Halides: Formation of Low Melting Salts
作者:Jean’ne M. Shreeve、Ye Gao
DOI:10.1055/s-2004-822334
日期:——
(1c) and 1,4-dimethylpiperazine (1d) were quaternized at N-1 with alkyl iodides and polyfluoroalkyl halides under either neat or solvent conditions at 10-110 °C to form N 1 CH 2 CH 2 C m F 2 m + 1 (m = 0, 1, 6, 10) diazinium iodides, and N 1 CH 2 CH 2 F diazinium bromides in moderate to excellent isolated yields. Metathesis of these alkyl and monopolyfluoroalkyl substituted diazinium halides with other
哒嗪 (1a)、吡嗪 (1b)、嘧啶 (1c) 和 1,4-二甲基哌嗪 (1d) 在 N-1 处与烷基碘和多氟烷基卤在纯或溶剂条件下在 10-110 °C 下季铵化以形成 N 1 CH 2 CH 2 C m F 2 m + 1 (m = 0, 1, 6, 10) 碘化二嗪鎓和 N 1 CH 2 CH 2 F 溴化二嗪鎓具有中等至极好的分离产率。这些烷基和单多氟烷基取代的二嗪卤化物与其他盐的复分解导致形成新的季铵化合物,其中一些属于离子液体类(mp <100 °C),其中 [N 1 (R f CH 2 CH 2 ) + ]Y (Y = NTf 2 , PF 6 , OTf, NO 3 , ClO 4 )。1,4-二甲基哌嗪与 2.5 当量 I-溴-2-氟乙烷的 DMSO 溶液得到二季铵化 N 1 , N 4 -(CH 2 CH 2 F) 2 产物。所有化合物均通过 1 H、 1 3 C、 1