Ruthenium(IV)-Catalyzed Markovnikov Addition of Carboxylic Acids to Terminal Alkynes in Aqueous Medium
作者:Victorio Cadierno、Javier Francos、José Gimeno
DOI:10.1021/om1010325
日期:2011.2.28
promote the selective Markovnikov addition of both aromatic and aliphatic carboxylic acids to a large variety of terminal alkynes, enynes, and diynes as well as propargylicalcohols. In this way, a wide number of enol esters and β-oxoesters could be synthesized in moderate to good yields under mild conditions (60 °C) in an aqueous medium.
Atom Economic Ruthenium-Catalyzed Synthesis of Bulky β-Oxo Esters
作者:Janine Jeschke、Marcus Korb、Tobias Rüffer、Christian Gäbler、Heinrich Lang
DOI:10.1002/adsc.201500712
日期:2015.12.14
Rutheniumcomplexes with the formulae Ru(CO)2(PR3)2(O2CPh)2 [6a–h; R=n-Bu, p-MeO-C6H4, p-Me-C6H4, Ph, p-Cl-C6H4, m-Cl-C6H4, p-CF3-C6H4, m,m′-(CF3)2C6H3] were prepared by treatment of triruthenium dodecacarbonyl [Ru3(CO)12] with the respective phosphine and benzoic acid or by the conversion of Ru(CO)3(PR3)2 (8e–h) with benzoic acid. During the preparation of 8, ruthenium hydride complexes of type Ru(CO)(PR3)3(H)2
钌配合物,分子式为Ru(CO)2(PR 3)2(O 2 CPh)2 [ 6a – h ; R =n- Bu,p -MeO-C 6 H 4,p -Me-C 6 H 4,Ph,p -Cl-C 6 H 4,m -Cl-C 6 H 4,p -CF 3 -C 6 H 4,m,m' -(CF 3)2 C 6 H 3 ]的制备方法是用膦和苯甲酸分别处理十二碳三钌[Ru 3(CO)12 ]或将Ru(CO)3(PR 3)2(8e - h)转化为苯甲酸。在制备8的过程中,可以分离出Ru(CO)(PR 3)3(H)2(9g,h)类型的氢化钌配合物作为副产物。讨论了新合成的固态配合物的分子结构。化合物发现6a - h是将羧酸添加到炔丙醇中以生成有价值的β-氧代酯的高效催化剂。催化剂筛选显示出膦的电子性质对所得活性的显着影响。使用具有吸电子膦配体的配合物6g和6h获得了最佳性能。另外,催化剂6g在空间上需要的底物的
Ruthenium-catalyzed synthesis of β-oxo esters in aqueous medium: Scope and limitations
作者:Victorio Cadierno、Javier Francos、José Gimeno
DOI:10.1039/b914774h
日期:——
The ability of the hydrosoluble ruthenium(II) complexes [RuCl2(η6-arene)(PTA)] 3a–d, [RuCl2(η6-arene)(PTA-Bn)] 4a–d, [RuCl2(η6-arene)(DAPTA)] 5a–d, [RuCl2(η6-arene)(TPPMS)] 6a–d (arene = C6H6, p-cymene, 1,3,5-C6H3Me3, C6Me6) to promote the atom-economic formation of β-oxo esters, by addition of carboxylic acids to terminal propargylicalcohols in water has been explored. Scope, limitations and catalyst
水溶性的能力 钌(II) 配合物[的RuCl 2(η 6 -arene)(PTA)] 3a–d,[的RuCl 2(η 6 -arene)(PTA-BN)] 4a–d,[的RuCl 2(η 6 -arene)(DAPTA)] 5a–d,[的RuCl 2(η 6 -arene)(TPPMS)] 6a–d(芳烃= C 6 H 6,对苯甲基(1,3,5-C 6 H 3 Me 3,C 6 Me 6)促进β-氧代酸酯的原子经济形成,方法是将羧酸加成到末端的炔丙基醇中水已被探索。范围,限制和催化剂 已使用最活跃的方法对回收进行了评估 催化剂将[RuCl 2(η 6 -C 6 H ^ 6)(TPPMS)],6A。
Conversion of Propargylic Alcohols to β-Oxo Esters Catalyzed by Novel Ruthenium-Phosphoramidite Complexes
作者:Stephen Costin、Nigam P. Rath、Eike B. Bauer
DOI:10.1002/adsc.200800355
日期:2008.10.6
from propargylicalcohols and carboxylic acids. Standard conditions involve cyclohexane solvent, propargylicalcohol (1.0 equiv.), carboxylic acid (1.0 equiv.), ruthenium catalyst (1.5 mol%), and 90 °C for 5–18 h. Isolated yields of the β-oxoesters range from 87 to 16% and show broad substrate generality. The reaction proceeds without racemization if a chiral propargylicalcohol is employed. The method
Ruthenium carboxylate complexes as easily prepared and efficient catalysts for the synthesis of β-oxopropyl esters
作者:Nicholas P. Hiett、Jason M. Lynam、Christine E. Welby、Adrian C. Whitwood
DOI:10.1016/j.jorganchem.2010.10.001
日期:2011.1
The easily prepared complex cis-[Ru(kappa(2)-O2CMe)(2)(PPh3)(2)] is an effective catalyst for the addition of carboxylic acids to propargyl alcohols to afford beta-oxopropyl esters. The reaction is tolerant to a range of functional groups on the propargyl alcohol and is effective in the case of the steroid ethisterone. An investigation into the ruthenium-containing products from the reaction involving benzoic acid revealed that rapid exchange between coordinated acetate and benzoate ligands occurs. The synthesis of crystallographically characterised cis-[Ru(kappa(2)-O2CPh)(2)(PPh3)(2)] was developed. This benzoate-substituted complex was shown to react with HC CPh and HC CC(OH)PhH to give [Ru(kappa(2)-O2CPh)(kappa(1)-O2CPh)(=C=CPhH) (PPh3)(2)] and [Ru(kappa(2)-O2CPh)(kappa(1)-O2CPh)(=C=CCOH}PhH)(PPh3)(2)] respectively. Reaction of cis-[Ru(kappa(2)-O2CPh) (2)(PPh3)(2)] with CO affords [Ru(kappa(2)-O2CPh)(kappa(1)-O2CPh)(CO)(PPh3)(2)] or [Ru(kappa(2)-O2CPh)(2)(CO)(2)(PPh3)(2)] depending on the conditions employed. Related carbonyl compounds are thought to be the rutheniumcontaining products from the catalytic reactions and [Ru(kappa(2)-O2CMe)(kappa(1)-O2CMe)(CO)(PPh3)(2)] was also shown to be a competent catalyst. (C) 2010 Elsevier B.V. All rights reserved.