Preparation of 2-(t-butyl)dimethylsilyl-3,3-difluoropropenones via acylation reactions of 1-(t-butyl)dimethylsilyl-2,2-difluoroethenylstannane
作者:Ye Rim Jeong、Hye Jin An、Sung Lan Jeon、In Howa Jeong
DOI:10.1016/j.jfluchem.2015.07.010
日期:2015.11
Stannylation reaction of 1-(t-butyl)dimethylsilyl-2,2-difluoroethenyl p-toluenesulfonate 1b with hexabutylbistin in the presence of 3 mol% Pd2(dba)3, 6 mol% XPhos and 30 equiv LiBr in THF at reflux temperature for 8 h provided the corresponding 1-(t-butyl)dimethylsilyl-2,2-difluoroethenylstannane 2b in 70% yield. The acylation reactions of 2b with a variety of acyl chlorides in the presence of 5 mol%
1-(叔丁基)二甲基甲硅烷基-2,2-二氟乙烯基对甲苯磺酸盐1b与六丁基双锡在3摩尔%Pd 2(dba)3,6摩尔%XPhos和30当量LiBr在THF中的回流反应搅拌8小时,以70%的产率提供了相应的1-(叔丁基)二甲基甲硅烷基-2,2-二氟乙烯基锡烷2b。2b与5%Pd(PPh 3)4和10 mol%CuI在THF中的存在下,在回流温度下2h与各种酰氯的酰化反应,得到2-(叔丁基)二甲基甲硅烷基-3, 3-二氟丙烯3b –3升,产率45–86%。