A systematic study into the Sonogashira cross-coupling of 1,1′-diiodoferrocene (fcI2) confirms that the Pd(0)–P(tBu)3 system provides a remarkable rate increase over Pd(0)–(PPh3)2. Attempts to couple 4-ethynylphenylthioacetate (2) with fcI2 instead produced a novel cyclic trimer of the former, from syn addition of S–Ac across CC.
对 1,1′-二
碘二茂铁(fcI2)的 Sonogashira 交叉偶联进行的系统研究证实,与 Pd(0)-(PPh3)2 相比,Pd(0)-P(tBu)3 系统能显著提高速率。在尝试将 4-
乙炔基
苯硫基乙酸酯 (2) 与 fcI2 结合使用时,前者产生了一种新型环状三聚体,它是由 S-Ac 通过 CC 合成的。