作者:Laurent Poorters、Dominique Armspach、Dominique Matt、Loïc Toupet
DOI:10.1039/b701684k
日期:——
The tetraphosphine 6A,6B,6D,6E-tetradeoxy-6A,6B,6D,6E-tetra(diphenylphosphinyl)-2A,2B,2C,2D,2E,2F,3A,3B,3C,3D,3E,3F,6C,6F-tetradeca-O-methyl-α-cyclodextrin (α-TEPHOS) has been prepared in high yield by reacting 6A,6B,6D,6E-tetra-O-methylsulfonyl-2A,2B,2C,2D, 2E,2F,3A,3B,3C,3D,3E,3F,6C,6F-tetradeca-O-methyl-α-cyclodextrin with excess PPh2Li. The product was purified in its BH3-protected form. α-TEPHOS is the first optically active tetraphosphine in which the four phosphine units are tethered to a cavity-shaped scaffold. When reacted with [AuCl(tetrahydrothiophene)], α-TEPHOS led to the corresponding tetragold complex [(α-TEPHOS)(AuCl)4] in which the four gold atoms are all located close to the primary face of the cyclodextrin. Reaction with [PdCl(o-C6H4CH2NMe2)]2 gave the C2-symmetrical complex [(α-TEPHOS)PdCl(o-C6H4CH2NMe2)}4]. Treatment of the ligand with two equiv. of [Rh(norbornadiene)(tetrahydrofuran)2]BF4 afforded selectively the bimetallic complex [(α-TEPHOS)Rh(norbornadiene)}2](BF4)2 in which each metal centre is coordinated to two phosphorus atoms belonging to adjacent glucose units.
6A,6B,6D,6E-四去氧-6A,6B,6D,6E-四(二苯基膦酰基)-2A,2B,2C,2D,2E,2F,3A,3B,3C,3D,3E,3F,6C,6F-四-O-甲基-δ-环糊精 (δ-TEPHOS)是由 6A、6B,6D,6E-四-O-甲基磺酰基-2A,2B,2C,2D,2E,2F,3A,3B,3C,3D,3E,3F,6C,6F-十四碳-O-甲基-δ-环糊精与过量的 PPh2Li 反应,制备了高产率的 δ-TEPHOS 。产物以 BH3 保护形式纯化。δ-TEPHOS是第一个具有光学活性的四膦,其中四个膦单元与一个空腔形支架相连。当与[AuCl(四氢噻吩)]反应时,δ-TEPHOS 会生成相应的四金复合物[(δ-TEPHOS)(AuCl)4],其中的四个金原子都位于环糊精的主面附近。与[PdCl(o-C6H4CH2NMe2)]2 反应得到 C2 对称配合物[(δ-TEPHOS)PdCl(o-C6H4CH2NMe2)}4]。用两个等量的[Rh(降冰片二烯)(四氢呋喃)2]BF4 处理配体,可选择性地得到双金属配合物[(δ±-TEPHOS)Rh(降冰片二烯)}2](BF4)2,其中每个金属中心与属于相邻葡萄糖单元的两个磷原子配位。