[EN] MONOCARBONYL RUTHENIUM AND OSMIUM CATALYSTS<br/>[FR] CATALYSEURS MONOCARBONYLE DE RUTHÉNIUM ET D'OSMIUM
申请人:UNIVERSITA' DEGLI STUDI DI UDINE
公开号:WO2017134618A1
公开(公告)日:2017-08-10
The invention relates to monocarbonyl complexes of ruthenium and osmium with bi- and tridentate nitrogen and phosphine ligands. The invention relates to methods for preparing these complexes and the use of these complexes, isolated or prepared in situ, as catalysts for reduction reactions of ketones and aldehydes both via transfer hydrogenation or hydrogenation with hydrogen.
was isolated from 1 by reaction with NEt3. The monocarbonyl complexes trans-[RuCl2(HCNN)(PPh3)(CO)] (5–7) were synthesizedfrom [RuCl2(dmf)(PPh3)2(CO)] and HCNN ligands, while the diacetate trans-[Ru(OAc)2(HCNN)(PPh3)(CO)] (8) was obtained from [Ru(OAc)2(PPh3)2(CO)]. Carbonylation of cis-[RuCl(CNN)(PPh3)2] with CO afforded the pincer derivatives [RuCl(CNN)(PPh3)(CO)] (9–11). Treatment of 9 with Na[BArf]4
Josiphos=1‐[1‐(dicyclohexylphosphano)ethyl]‐2‐(diarylphosphano)ferrocene) have been prepared by treating [RuCl2(PPh3)3] with (S,R)‐Josiphos diphosphanes and 1‐substituted‐1‐(6‐arylpyridin‐2‐yl)methanamines (HCNN; substituent=H (1 a), Me (1 b), and tBu (1 c)) with NEt3. By using 1 b and 1 c as a racemic mixture, complexes 4–7 were obtained through a diastereoselective synthesis promoted by acetic acid. These pincer
Preparation of Neutral <i>trans - cis</i> [Ru(O<sub>2</sub>CR)<sub>2</sub>P<sub>2</sub>(NN)], Cationic [Ru(O<sub>2</sub>CR)P<sub>2</sub>(NN)](O<sub>2</sub>CR) and Pincer [Ru(O<sub>2</sub>CR)(CNN)P<sub>2</sub>] (P = PPh<sub>3</sub>, P<sub>2</sub> = diphosphine) Carboxylate Complexes and their Application in the Catalytic Carbonyl Compounds Reduction
The diacetate complexes trans-[Ru(κ1-OAc)2(PPh3)2(NN)] (NN = ethylenediamine (en) (1), 2-(aminomethyl)pyridine (ampy) (2), 2-(aminomethyl)pyrimidine (ampyrim) (3)) have been isolated in 76–88% yield by reaction of [Ru(κ2-OAc)2(PPh3)2] with the corresponding nitrogen ligands. The ampy-type derivatives 2 and 3 undergo isomerization to the thermodynamically most stable cationic complexes [Ru(κ1-OAc)(PPh3)2(NN)]OAc
respect to the OH group, using 2-propanol-d8 as solvent with Ru or Os pincer complexes and KOtBu at 30–50 °C. For secondary alcohols incorporation of deuterium at the β position has also been observed. In 2-propanol-d8 the pincer complexes catalyze the simultaneous deuteration and racemization of (S)-1-phenylethanol, the two processes being strictly correlated. For both reactions much the same activity
钳形配合物[MX(CNN)(PP)](M = Ru,Os; X = Cl,OTf; HCNN = 1-(6-芳基吡啶-2-基)甲胺; PP =二膦)已被证明可有效催化两种在碱存在下酒精的消旋化和氘化。手性醇已在30–50°C下使用1 mol%的Ru或Os钳状络合物和5 mol%的KO t Bu消旋。2-丙醇。使用2-丙醇-d 8作为溶剂与Ru或Os pincer配合物和KO t Bu在30–50°C时,相对于OH基团,伯醇和仲醇可在α位有效地氘化。对于仲醇,还已经观察到氘在β位置上的掺入。在2-丙醇-d 8中,钳状配合物催化同时氘化和消旋(S)-1-苯乙醇,这两个过程是严格相关的。对于这两个反应,使用Ru和Os络合物观察到的活性几乎相同。相对于相关化合物[MCl 2(NN)(PP)](N =二齿胺或吡啶配体)。新的配合物[的MC1(CNN)(PP)](M = RU,合成2,4和Os,6,7