Efficient, recoverable, copper-catalyzed aerobic oxidation of alcohols under FBS and thermomorphic mode
作者:Norman Lu、Yan-Chou Lin
DOI:10.1016/j.tetlet.2007.10.074
日期:2007.12
successfully used to the aerobicoxidation of alcohols under the fluorous biphasic system (FBS). The resulting products from FBS could be easily recovered by two phase separation with high yields up to 8 runs (>90%). In order to avoid using the expensive fluorous solvents, systems 3a–d, CuBr·Me2S/Bpy (1a–d)/TEMPO, were also successfully shown to catalyze the aerobicalcoholoxidation under the thermomorphic
一系列氟化联吡啶衍生物,(4,4'-bis(R f CH 2 OCH 2)-2,2'-bpy)R f = n -C 8 F 17(1a),n -C 9 F 19(1b),n -C 10 F 21(1c),n -C 11 F 23(1d)}是使用4,4'-双(溴亚甲基)-2,2'-bpy和氟化醇盐成功合成的。Bpy 1a – d已通过多核(1 H,19 F和13 C)NMR,GC / MS和FTIR进行了表征。铜配合物2a – d可以通过在室温下分别将配体1a – d与CuBr·Me 2 S搅拌而原位生成。3组分系统3c - d,CuBr·Me 2 S / Bpy(1c - d)/ 2,2,6,6-四甲基哌啶1-氧基(TEMPO)已成功用于氟双相体系(FBS)下酒精的好氧氧化。通过两相分离可以轻松回收FBS生成的产品,最高收率可达8次(> 90%)。为了避免使用昂贵的氟代溶剂,系统3a