An effective methodology has been developed for the synthesis of enantiopure 2,2'-dialkynylated 1,1'-binaphthalene derivatives. Enantiopure 2,2'-diiodo-1,1'-binaphthalene (10) provided 2,2'-diethynyl-1,1'-binaphthalene (16) in the Negishi alkynylation supported by microwave irradiation in a very good yield with conservation of stereochemical information. The Stephen-Castro alkynylation of 10 afforded products in lower yields; however, in stereoconservative manner as well. Terminal diacetylene 16 served as precursor in the Sonogashira cross-coupling reaction to give new bispyridine derivatives 7-9 as potential ligands in moderate to high yields. Coordination of bispyridines with Zn2+ and Ag+ ions was observed by NMR and CD spectroscopy. The coordination ability of bis(2-pyridylethynyl) derivative 7 to palladium cation was determined by X-ray structure analysis.
已开发出一种有效的方法来合成对映纯的2,2'-二炔基化
1,1'-联萘衍
生物。对映纯的2,2'-二
碘-
1,1'-联萘(
10)在微波辐射支持的Negishi炔基化反应中,以很高的产率提供了2,2'-二
乙炔基-
1,1'-联萘(
16),并保留了立体
化学信息。对
10的Stephen-Castro炔基化反应产率较低,但也以立体保留的方式进行。末端二
乙炔基化合物
16作为Sonogashira交叉偶联反应的前体,以中等至高产率生成新的双
吡啶衍生物7-
9,作为潜在的
配体。通过NMR和CD光谱观察到双
吡啶与Zn
2+和Ag
+离子的配位能力。双(2-
吡啶基
乙炔基)衍
生物7与
钯阳离子的配位能力通过X射线结构分析确定。