The cross-coupling reactions of 2,2-difluoro-1-iodoethenyl tosylate (2) with 2 equiv of boronic acids in the presence of catalytic amounts of Pd(OAc)2 and Na2CO3 afforded the mono-coupled products 3 and 5 in high yields. The use of 4 equiv of boronic acids in the presence of catalytic amount of Pd(PPh3)2Cl2 and Na2CO3 in this reaction resulted in the formation of symmetrical di-coupled products 4 in high yields. Unsymmetrical di-coupled products 4 were obtained in high yields from the reactions of 3 with 2 equiv of boronic acids in the presence of catalytic amounts of Pd(OAc)2 and Na2CO3.
2,2-二氟-1-碘乙烯基对甲苯磺酸酯(2)与2当量硼酸在Pd(OAc)2和Na2CO3的催化下发生交叉偶联反应,高产率地生成了单偶联产物3和5。在此反应中,使用4当量硼酸在Pd(PPh3)2Cl2和Na2CO3的催化下,形成了对称双偶联产物4,产率较高。在Pd(OAc)2和Na2CO3的催化下,将3与2当量硼酸反应,高产率地得到了非对称双偶联产物4。