Synthesis of 2-aryl-1,1-difluoro-1,3-enynes via consecutive cross-coupling reactions of 2,2-difluoro-1-iodoethenyl p-toluenesulfonate
作者:Ju Hee Kim、Ye Rim Jeong、Sung Lan Jeon、In Howa Jeong
DOI:10.1016/j.jfluchem.2014.07.007
日期:2014.11
Alkynylation reaction of 2,2-difluoro-1-iodoethenyl p-toluenesulfonate 1 with alkynyltributylstannanes in the presence of 10 mol% Pd(PPh3)4 and 10 mol% CuI in THF at reflux temperature for 3 h provided the corresponding 1,1-difluoro-1,3-enynyl tosylates 2 in 65–85% yields. The further arylation reaction of 2 with aryltributylstannanes in the presence of 10 mol% Pd(PPh3)2Cl2 and 3 equiv. of LiBr in
2,2-二氟-1-碘乙烯基对甲苯磺酸酯1与炔基三丁基锡的炔基化反应在THF中存在10 mol%Pd(PPh 3)4和10 mol%CuI的条件下于回流温度下进行3小时,得到相应的1,1 -二氟-1,3-烯丙基甲苯磺酸酯2的产率为65-85%。在10摩尔%Pd(PPh 3)2 Cl 2和3当量的存在下,2与芳基三丁基锡的进一步芳基化反应。在回流温度下,将四溴联苯中的溴化锂在THF中回流8小时,以32-83%的产率获得偶联产物3。