N‐heterocyclic alcohols. Chiral ruthenium catalyst formed in situ using the chitosan biopolymer as ligand, which provided good results in the transferhydrogenation of heterobicyclic compounds, such as 4‐chromanone and 4‐thiochromanone, was used in reactions of various N‐containing prochiral ketones. High enantioselectivities were reached in transferhydrogenations of bicyclic compounds bearing nitrogen
[EN] NOVEL RUTHENIUM CATALYSTS AND THEIR USE FOR ASYMMETRIC REDUCTION OF KETONES<br/>[FR] NOUVEAUX CATALYSEURS AU RUTHÉNIUM ET LEUR UTILISATION POUR LA RÉDUCTION ASYMÉTRIQUE DE CÉTONES
申请人:BOEHRINGER INGELHEIM INT
公开号:WO2015002769A1
公开(公告)日:2015-01-08
Disclosed are novel ruthenium compounds of formula (Ia) and (Ib): wherein R1 and the moiety L ∩ L are defined herein. Also disclosed is a process for using these novel ruthenium compounds as catalysts for asymmetric hydrogenation and transfer hydrogenation of ketones with high reactivities and excellent selectivities.
NOVEL RUTHENIUM CATALYSTS AND THEIR USE FOR ASYMMETRIC REDUCTION OF KETONES
申请人:HADDAD Nizar
公开号:US20150005500A1
公开(公告)日:2015-01-01
Disclosed are novel ruthenium compounds of formula (Ia) and (Ib):
wherein R
1
and the moiety
are defined herein. Also disclosed is a process for using these novel ruthenium compounds as catalysts for asymmetric hydrogenation and transfer hydrogenation of ketones with high reactivities and excellent selectivities.
Preparative‐Scale Biocatalytic Oxygenation of
<i>N</i>
‐Heterocycles with a Lyophilized Peroxygenase Catalyst
作者:Balázs Pogrányi、Tamara Mielke、Alba Díaz‐Rodríguez、Jared Cartwright、William P. Unsworth、Gideon Grogan
DOI:10.1002/anie.202214759
日期:2023.1.26
A lyophilized preparation of an unspecific peroxygenase variant from Agrocybe aegerita (rAaeUPO-PaDa-I-H) is a highly effective catalyst for the oxygenation of a diverse range of N-heterocyclic compounds. Scalable, high yielding and enantioselective biocatalyticoxygenations have been developed, including 27 preparative examples (ca. 100 mg scale) across a wide range of substrates, including alkyl
Amine-Tunable Ruthenium Catalysts for Asymmetric Reduction of Ketones
作者:Sonia Rodríguez、Bo Qu、Keith R. Fandrick、Frederic Buono、Nizar Haddad、Yibo Xu、Melissa A. Herbage、Xingzhong Zeng、Shengli Ma、Nelu Grinberg、Heewon Lee、Zhengxu S. Han、Nathan K. Yee、Chris H. Senanayake
DOI:10.1002/adsc.201300727
日期:2014.2.10
AbstractA series of efficient ruthenium catalysts has been developed for the asymmetric hydrogenation and transfer hydrogenation of ketones with high reactivities and selectivities. The new chiral bisdihydrobenzooxaphosphole (BIBOP)/diamine‐ruthenium complexes catalyzed the enantioselective hydrogenation of substrates such as aryl and heteroaryl cyclic and alkyl ketones with substrate/catalyst (S/C) ratios of up to 100,000. The opposite sense of enantioselectivity can be obtained by proper selection of a diamine with a given chirality of the phosphine. The usefulness of the new system has been demonstrated in the asymmetric hydrogenation of a complex synthetic intermediate towards cholesteryl ester transfer protein (CETP) inhibitors at S/C 20,000 on large‐scale operation.magnified image