Modular Phosphole-Methano-Bridged-Phosphine(Borane) Ligands. Application to Rhodium-Catalyzed Reactions
作者:Duc Hanh Nguyen、Jérôme Bayardon、Christine Salomon-Bertrand、Sylvain Jugé、Philippe Kalck、Jean-Claude Daran、Martine Urrutigoity、Maryse Gouygou
DOI:10.1021/om2008265
日期:2012.2.13
shown by the X-ray crystal structures of the complexes 10b,c. Rhodium complexes 8 and 10 isolated or formed in situ with ligands 4 and 5 were studied for catalytic hydrogenation of methyl 2-(acetamidomethyl)acrylate (11) and hydroboration of styrene (13) with catecholborane. In both reactions, the catalytic systems prepared either from the phospholyl(phosphinoborane)methane ligands 4 or the corresponding
磷酰(膦硼烷)甲烷空气和水分稳定的杂化配体4a – f的合成,是通过1-苯基磷脂1a – d通过在甲氧基桥上进行的P–C键偶联而进行的。根据用作亲核试剂或亲电试剂的磷酰基部分,研究了两种策略。在第一个途径中,磷酰基阴离子与易于获得的(氯甲基)二苯基膦-硼烷3反应,以29-67%的分离产率提供配体4a - d。在第二种途径中,磷酰基(二环己基膦基硼烷)甲烷配体4e,f通过氰基磷腈上的亲核取代合成了18-23%的收率。在DABCO的协助下,4a – c上BH 3部分的去除导致杂化的磷酰基(二苯基膦基)甲烷5a – c。化合物4和5被完全表征通过多核NMR谱(1个H,31 P,13 C,11 B),质谱和元素分析,并且在X射线晶体结构图4a,Ç和图5a,b已经建立。配体5a,b用于制备阳离子铑络合物的[Rh(η 4 -COD)(图5a)] +(8A' ),铑[Rh(η 4 -COD)(图5b)]