A novel full atom-economic process for the transformation of alkynes into chiralalcohols by TfOH-catalyzed hydration coupled with Ru-catalyzed tandem asymmetric hydrogenation in TFE under simple conditions has been developed. A range of chiralalcohols was obtained with broad functional group tolerance, good yields, and excellent stereoselectivities.
Pentaphenylcyclopentadienyl ruthenium complexes (3) are excellent catalysts for the racemization of secondary alcohols at ambient temperature. The combination of this process with enzymatic resolution of the alcohols results in a highly efficient synthesis of enantiomericallypure acetates at room temperature with short reaction times for most substrates. This new reaction was applied to a wide range
One-pot synthesis of chiral alcohols from alkynes by CF<sub>3</sub>SO<sub>3</sub>H/ruthenium tandem catalysis
作者:Huan Liu、Sensheng Liu、Haifeng Zhou、Qixing Liu、Chunqin Wang
DOI:10.1039/c8ra02224k
日期:——
A practical one-pot synthesis of chiral alcohols from readily available alkynes via tandem catalysis by the combination of CF3SO3H and a fluorinated chiral diamine Ru(II) complex in aqueous CF3CH2OH is described. Very interestingly, the combination of fluorinated catalysts and solvent exhibits a positive fluorine effect on the reactivity and enantioselectivity. A range of chiral alcohols with wide
描述了通过在 CF 3 CH 2 OH水溶液中结合 CF 3 SO 3 H 和氟化手性二胺 Ru( II )配合物,从现成的炔烃通过串联催化的实用一锅法合成手性醇。非常有趣的是,氟化催化剂和溶剂的组合对反应性和对映选择性表现出积极的氟效应。在简单温和的条件下,以高收率和优异的立体选择性获得了一系列具有广泛官能团耐受性的手性醇。
Mechanistic basis for the enantioselectivity of the anaerobic hydroxylation of alkylaromatic compounds by ethylbenzene dehydrogenase
enantioselectivity toward (S)-secondary alcohols (18 substrates converted with > 99% ee). Theoretical QM:MM modeling was used to elucidate the structure of the catalytically active form of the enzyme and to study the reaction mechanism and factors determining its high degree of enantioselectivity. This analysis showed that the enzyme imposes strong stereoselectivity on the reaction by discriminating the hydrogen atom
Aminocyclopentadienyl Ruthenium Complexes as Racemization Catalysts for Dynamic Kinetic Resolution of Secondary Alcohols at Ambient Temperature
作者:Jun Ho Choi、Yoon Kyung Choi、Yu Hwan Kim、Eun Sil Park、Eun Jung Kim、Mahn-Joo Kim、Jaiwook Park
DOI:10.1021/jo0355799
日期:2004.3.1
tests in the racemization of (S)-4-phenyl-2-butanol showed that 7 is the most active catalyst, although the difference decreased in the DKR. Complex 4 was used in the DKR of various alcohols; at room temperature, not only simple alcohols but also functionalized ones such as allylic alcohols, alkynyl alcohols, diols, hydroxyl esters, and chlorohydrins were successfully transformed to chiral acetates. In