Coupled chemoenzymatic transfer hydrogenation catalysis for enantioselective reduction and oxidation reactions
摘要:
Stereoselective reductions of prochiral ketones were performed using a new thermophilic, NAD-dependent alcohol dehydrogenase from Thermus sp. (TADH). The enzyme was produced on 2L-scale from recombinant Escherichia coli and purified by a simple, one-step heat treatment procedure yielding 220 mg of pure enzyme. Regeneration of NADH was catalyzed by the organometallic complex [Cp*Rh(bpy)(H2O)](2+) using formate as a reducing agent. The catalytic performance of [Cp*Rh(bpy)(H2O)](2+) in terms of total number of catalytic cycles and number of catalytic cycles per hour achieved herein (up to 1500 and more than 400 h(-1), respectively), are the highest reported for a non-enzymatic nicotinamide regeneration system so far. Chemoenzymatic reduction reactions in a two liquid phase setup were performed on a gramme-scale, for example, 1.3 g of enantiopure (1S,3S)-3-methylcyclohexanol was obtained after purification. The volumetric productivity reached up to 3.9 mM h(-1) with an average of 2.6 mM h(-1) (5.3 g L-1 d(-1)) over 10 h. In addition, chemoenzymatic oxidations utilizing the same catalyst set and molecular oxygen as a terminal electron acceptor were performed. Thus, the preparative value of chemoenzymatic transfer hydrogenations with [Cp*Rh(bpy)(H2O)](2+) as a regeneration catalyst coupled especially to thermophilic ADHs was demonstrated. (c) 2005 Elsevier Ltd. All rights reserved.
The present invention provides compounds, compositions thereof, and methods of using the same for the inhibition of TYK2, and the treatment of TYK2-mediated disorders.
本发明提供了化合物、其组合物以及使用它们来抑制TYK2并治疗TYK2介导的疾病的方法。
Chemo-Enzymatic Oxidative Rearrangement of Tertiary Allylic Alcohols: Synthetic Application and Integration into a Cascade Process
作者:Elisabetta Brenna、Michele Crotti、Matteo De Pieri、Francesco G. Gatti、Gabriele Manenti、Daniela Monti
DOI:10.1002/adsc.201800299
日期:2018.10.4
developed to easily transform a cyclopentenone derivative into trans‐Magnolione® and dehydro‐Magnolione®. The rearrangement of exocyclic allylic alcohols was tested as well, and a dynamic kinetic resolution was observed: α,β‐unsaturated ketones with (E)‐configuration and a high diastereomeric excess were synthesized. Finally, the 2,2,6,6‐tetramethyl‐1‐piperidinium tetrafluoroborate (TEMPO+BF4−)/laccase
A Practical and Stereoselective In Situ NHC-Cobalt Catalytic System for Hydrogenation of Ketones and Aldehydes
作者:Rui Zhong、Zeyuan Wei、Wei Zhang、Shun Liu、Qiang Liu
DOI:10.1016/j.chempr.2019.03.010
日期:2019.6
widely applied organic transformation. Sustainable chemistry goals require replacing conventional noble transition metal catalysts for hydrogenation by earth-abundant base metals. Herein, we report how a practical in situ catalytic system generated by easily available pincer NHC precursors, CoCl2, and a base enabled efficient and high-yielding hydrogenation of a broad range of ketones and aldehydes (over
Expedient Synthesis of Bridged Bicyclic Nitrogen Scaffolds via Orthogonal Tandem Catalysis
作者:Sovan Biswas、Ben F. Van Steijvoort、Marjo Waeterschoot、Narendraprasad Reddy Bheemireddy、Gwilherm Evano、Bert U. W. Maes
DOI:10.1002/anie.202106716
日期:2021.9.27
Bridged nitrogen bicyclic skeletons have been accessed via unprecedented site- and diastereoselective orthogonal tandem catalysis from readily accessible reactants in a step economic manner. Directed Pd-catalyzed γ-C(sp3)-H olefination of aminocyclohexane with gem-dibromoalkenes, followed by a consecutive intramolecular Cu-catalyzed amidation of the 1-bromo-1-alkenylated product delivers the interesting
[EN] 2,3,5-TRISUBSTITUTED PYRAZOLO[1,5-A]PYRIMIDINE COMPOUNDS<br/>[FR] COMPOSÉS DE PYRAZOLO[1,5-A]PYRIMIDINE 2,3,5-TRISUBSTITUÉS
申请人:ARCUS BIOSCIENCES INC
公开号:WO2020247496A1
公开(公告)日:2020-12-10
Compounds that inhibit PI3Kγ, and compositions containing the compound(s) and methods for synthesizing the compounds, are described herein. Also described are the use of such compounds and compositions for the treatment of a diverse array of diseases, disorders, and conditions, including cancer- and immune-related disorders that are mediated, at least in part, by PI3Kγ.