New Benzo[<i>h</i>]quinoline-Based Ligands and their Pincer Ru and Os Complexes for Efficient Catalytic Transfer Hydrogenation of Carbonyl Compounds
作者:Walter Baratta、Maurizio Ballico、Salvatore Baldino、Giorgio Chelucci、Eberhardt Herdtweck、Katia Siega、Santo Magnolia、Pierluigi Rigo
DOI:10.1002/chem.200800888
日期:2008.10.20
ligands (HCN'N) containing a CHRNH2 (R=H (a), Me (b), tBu (c)) function in the 2-position were prepared starting from benzo[h]quinoline N-oxide (in the case of ligand a) and 2-chlorobenzo[h]quinoline (for ligands b and c). These compounds were used to prepare ruthenium and osmium complexes, which are excellent catalysts for the transfer hydrogenation (TH) of ketones. The reaction of a with [RuCl2(PPh3)3]
从苯并[h]喹啉N-开始,制备了在2-位含有CHRNH2(R = H(a),Me(b),tBu(c))功能的新苯并[h]喹啉配体(HCN'N)。氧化物(对于配体a)和2-氯苯并[h]喹啉(对于配体b和c)。这些化合物用于制备钌和络合物,它们是酮转移氢化(TH)的极佳催化剂。a与[RuCl2(PPh3)3]在2-丙醇中的反应在回流条件下提供了齿状的CN'N络合物[RuCl(CN'N)(PPh3)2](1),而络合物[RuCl(CN'N )(dppb)](2-4; dppb = Ph2P(CH2)4PPh2)分别由[RuCl2(PPh3)(dppb)]和ac分别获得。(R,S)-Josiphos,(S,R)-Josiphos *,(S,S)-Skewphos和(S)-MeO-Biphep与[RuCl2(PPh3)3]和配体a结合使用手性衍生物[RuCl(CN'N)(PP)](5-8)。通过用d