Preparation of (2,2-difluoroethenylidene)bis(tributylstannane) and arylation reaction: efficient approach to 1,1-diaryl-2,2-difluoroethenes
作者:Seung Yeon Han、Hyo Young Lee、Jong Hee Jeon、In Howa Jeong
DOI:10.1016/j.tetlet.2012.01.127
日期:2012.4
Reaction of 2,2-difluoro-1-tributylstannylethenyl p-toluenesulfonate (1) with bis(tributyltin) in the presence of 5 mol % Pd(PPh3)4 and 30 equiv LiBr in THF at reflux temperature for 7 h afforded (2,2-difluoroethenylidene)bis(tributylstannane) (2) in a 70% yield. Coupling reaction of 2 with aryl iodides in the presence of 5 mol % Pd(PPh3)4 and 5 mol % CuI in DMF at 80 °C for 3–4 h provided the coupled
2,2-二氟-1-三丁基苯乙烯基对甲苯磺酸酯(1)与双(三丁基锡)在5 mol%Pd(PPh 3)4和30当量LiBr的存在下于THF中在回流温度下反应7小时(2 ,(2-二氟乙烯基)双(三丁基锡烷)(2),产率为70%。偶合的反应2中5摩尔%的Pd(PPh的存在下与芳基碘化物3)4在80和5%(摩尔)的CuI在DMF℃下3-4小时提供的偶联产物3在59-85%的产率。