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
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 Efficient Catalysts for the Addition of Carboxylic Acids to Propargylic Alcohols
作者:Janine Jeschke、Christian Gäbler、Marcus Korb、Tobias Rüffer、Heinrich Lang
DOI:10.1002/ejic.201500203
日期:2015.6
Heinrich Lang at the Technische Universitat Chemnitz, Germany. The cover image shows the atom-economical and highly selective addition of carboxylic acids to propargylicalcohols to give β-oxopropyl esters. This conversion is catalyzed by ruthenium complexes, represented by the skater in our picture.
德国开姆尼茨理工大学的 Heinrich Lang 小组受邀为本期杂志封面。封面图片显示了羧酸与炔丙醇的原子经济性和高选择性加成,以得到 β-氧代丙酯。这种转化由钌配合物催化,由我们图片中的溜冰者代表。