Palladium-catalyzed cross-coupling reaction of ethynylstibanes with organic halides
作者:Naoki Kakusawa、Kouichiro Yamaguchi、Jyoji Kurita
DOI:10.1016/j.jorganchem.2005.03.021
日期:2005.6
The reaction of ethynylstibanes (1a–g) with vinyl halides or triflate in the presence of a palladium catalyst led to the formation of cross-coupling products (5a–g, 10–12) in good to moderate yield, along with homo-coupling products (6a–g). A similar reaction of ethynyldiphenylstibane (1a) with aryl iodides (13a–i) also gave cross-coupling products (14a–i), although the yields were relatively low.
在钯催化剂的存在下,乙炔基苯乙烯(1a – g)与卤化乙烯或三氟甲磺酸酯的反应导致形成交联产物(5a – g,10 – 12),具有良好至中等的收率以及均相偶联产品(6a–g)。乙炔基二苯基乙b (1a)与芳基碘化物(13a – i)的类似反应也产生交叉偶联产物(14a – i),尽管产量相对较低。交叉偶联产物的产率高度依赖于所用溶剂的性质,当反应在HMPA或胺(如二乙胺和吗啉)中进行时,可获得良好的结果。结果表明,HMPA和用作溶剂的胺可通过锑和氧(对于HMPA)或氮(对于胺)之间的分子间配位作用,促进1上的乙炔基向钯的金属转移。