Base-Mediated Synthesesof New 6,6′-Di(polyfluoroalkoxy)-2,2′-Bipyridines with100% Regioselectivity
作者:Jean’ne M. Shreeve、Rajendra P. Singh、Gary V. Eggers
DOI:10.1055/s-2003-39173
日期:——
Reactions of N,N-difluoro-2,2′-bipyridinium bis(tetrafluoroborate) (MEC-31) (1) with fluorinated alcohols RfOH [Rf = CF3CH2, CH2FCH2, CF3CF2CH2, CHF2CF2CH2, (CF3)2CH] 2a-e, in the presence of a base at 70 °C without solvent, gave good yields of 6,6′-di(polyfluoroalkoxy)-2,2′-bipyridines 3a-e with 100% regioselectivity. Triethylamine with 1, produced 6,6′-difluoro-2,2-bipyridine (4).
N,N-二氟-2,2'-联吡啶二氟硼酸盐(MEC-31)(1)与氟化醇 RfOH [Rf = CF3CH2, CH2FCH2, CF3CF2CH2, CHF2CF2CH2, (CF3)2CH] 2a-e,在70°C、无溶剂的条件下,在碱的存在下反应,得到了良好的6,6'-二(多氟烷氧基)-2,2'-联吡啶3a-e,具有100%的区域选择性。与1反应的三乙胺生成了6,6'-二氟-2,2'-联吡啶(4)。