作者:Masaru Kimura、Gonghao Lu、Hiroshi Iga、Mitsuru Tsunenaga、Zhiqiang Zhang、Zhizhi Hu
DOI:10.1016/j.tetlet.2007.01.146
日期:2007.4
The thermal reaction of chiral 2-phenyl-4-(p-X-phenyl)-5-(p-Y-phenyl)-4-tert-butyldimethylsilylperoxy-4H-isoimidazoles (5b: X = CF3, Y = OMe; 5c: X = CF3, Y = F) was carried out in DMSO. The chiral 2-phenyl-5-(p-X-phenyl)-5-(p-Y-phenyl)-5H-imidazol-4-ones (4b: X = CF3, Y = OMe; 4c: X = CF3, Y = F) were quantitatively obtained in 50–60% enantiomer excess (ee). The mechanism for the reaction was proved
手性2-苯基-4-(对-X-苯基)-5-(对-Y-苯基)-4-叔丁基二甲基甲硅烷基过氧-4 H-异咪唑的热反应(5b:X = CF 3,Y = OMe ;5c:X = CF 3,Y = F)在DMSO中进行。手性2-苯基-5-(对-X-苯基)-5-(对-Y-苯基)-5 H-咪唑-4-酮(4b:X = CF 3,Y = OMe; 4c:X = CF 3,Y = F)以50-60%对映异构体过量(ee)定量获得。已证明该反应的机理是立体选择性的1,5-苯基迁移。尽管根据伍德沃德-霍夫曼法则应允许热迁移1,5-苯基,但实际上该迁移过程包括逐步过程。