Article
Chemistry, Multidisciplinary
Yanhua Hu, Yashi Zou, Huiwen Yang, Haotian Ji, Yue Jin, Zhenfeng Zhang, Yangang Liu, Wanbin Zhang
Summary: Asymmetric sequential hydrogenations of conjugated enynes have been developed using a Ph-BPE-Co-I catalyst for the precise synthesis of chiral Z-allylamides with high activity and excellent enantioselectivity. The difference in catalytic activity between cobalt complexes of Ph-BPE and QuinoxP* was explained by the process decomposition of rate-determining step in the second hydrogenation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Organic
Jian Song, Wen-Hua Zheng
Summary: A highly enantioselective method for the kinetic resolution of racemic tertiary alcohols has been developed using chiral organotin-catalyzed intermolecular acylation. The process can be carried out under mild reaction conditions and has a broad substrate scope, allowing for the separation of the corresponding products and highly enantioselective recovery of tertiary alcohols with s factors up to >200.
Article
Chemistry, Physical
Yan Zhang, F. Wieland Goetzke, Kirsten E. Christensen, Stephen P. Fletcher
Summary: In this study, we report an asymmetric catalytic method for the synthesis of YZJ-1139(1) and related compounds. By using a Rh-catalyzed reaction, a racemic N-Boc-nortropane-derived allylic chloride was coupled with (hetero)aryl boronic esters via an asymmetric Suzuki-Miyaura-type cross-coupling reaction, and an unexpected kinetic resolution was achieved. The enantiopure allyl chloride obtained can undergo highly enantiospecific reactions. This method was applied in the formal synthesis of YZJ-1139(1) with high stereoselectivity.
Review
Biotechnology & Applied Microbiology
Chenming Huang, Junling Liu, Jiali Fang, Xian Jia, Zhendong Zheng, Song You, Bin Qin
Summary: This review discusses the advances in the research area of KRED-catalyzed asymmetric synthesis for biomanufacturing of chiral chemicals with at least two chiral centers through the kinetic resolution (KR) approach and the dynamic kinetic resolution (DKR) approach.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Juan Liu, Yi-Ying Du, Yu-Shi He, Yan Liang, Shang-Zhong Liu, Yi-Yi Li, Yi-Ming Cao
Summary: In this study, a chiral phosphoric acid catalyzed apparent hydrolytic ring-opening reaction was developed for racemic aziridines in a regiodivergent parallel kinetic resolution manner. Through the acyloxy-assisted strategy, highly stereocontrolled nucleophilic ring-opening of aziridines with water was achieved, resulting in enantioenriched amino alcohols with high yields and enantiomeric ratios.
Article
Chemistry, Organic
Pedro P. De Castro, Gabriel M. F. Batista, Giovanni W. Amarante, Helio F. Dos Santos
Summary: Theoretical calculations and control experiments were used to investigate the mechanism and origin of enantioselectivity in the phosphoric-acid-catalyzed dynamic kinetic resolution of azlactones. The results identified a Munchnone intermediate as crucial in the isomerization of azlactone rings, and the developed model successfully predicted enantioselectivity under various reaction conditions.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Chemistry, Organic
Zaneta Papadopulu, Martin Oestreich
Summary: A method for the nonenzymatic kinetic resolution of sterically congested alcohols with a quaternary carbon atom in the beta-position is reported, using the catalyst system CuCl/NaOtBu/(R,R)-Ph-BPE together with a 3,5-xylyl-substituted tertiary hydrosilane to achieve enantioselective silylation of the hydroxy group. Several alcohols are obtained with good to excellent selectivity factors, and there are currently no other known straightforward methods to access these motifs.
Article
Multidisciplinary Sciences
Qingjing Yang, Zihao Wang, Catherine Hong Huan Hor, Haitao Xiao, Zhaoxiang Bian, Jun (Joelle) Wang
Summary: This study reports a highly efficient kinetic resolution method for the synthesis of chiral flavanols with two stereocenters. In vitro experiments and RNA sequencing analysis revealed the potential anti-inflammation effects of these flavanols.
Article
Chemistry, Physical
Wei Hao, Candice L. Joe, Andrea Daru, Sloan Ayers, Antonio Ramirez, Bhupinder Sandhu, Ryan A. Daley, Jason S. Chen, Michael A. Schmidt, Donna G. Blackmond
Summary: The mechanism of asymmetric hydrogenation of 2-pyridyl alkenes catalyzed by chiral Rh-phosphine complexes has been studied at ambient temperature. The reaction involves reversible substrate binding followed by rate-determining hydrogen addition. Substrate binding occurs only through the pyridine nitrogen and is not influenced by hydrogen pressure. Catalyst deactivation is observed due to the presence of an off-cycle Rh-hydride species. The stereochemical outcome in this system correlates with the relative stability of the E and Z rotamers of the substrate.
Article
Chemistry, Multidisciplinary
Jia Guo, Hao-Ran Ma, Wen-Bin Xiong, Luoyi Fan, You-Yun Zhou, Henry N. C. Wong, Jian-Fang Cui
Summary: An efficient kinetic resolution of alkyl allylic alcohols has been achieved through an iridium-catalyzed enantioselective alkynylation reaction. The method allows for the synthesis of chiral 1,4-enynes with various functional groups and unreacted enantioenriched allylic alcohols. It is particularly effective for preparing optically pure alkyl allylic alcohols that are difficult to access via other asymmetric reactions.
Article
Chemistry, Physical
Jian Zhang, Mingyang Song, Weijun Tang, Dong Xue, Jianliang Xiao, Huaming Sun, Chao Wang
Summary: Converting racemic compounds to enantioenriched products is a common method in accessing chiral molecules. In this study, a kinetic resolution method is used to transform racemic allylic alcohols into chiral compounds, with good yields and stereoselectivities.
Article
Chemistry, Organic
Yue Zhu, Jiayu Zhou, Jing Li, Kai Xu, Jianxun Ye, Yufei Lu, Delong Liu, Wanbin Zhang
Summary: The kinetic resolution of azaflavanones has been successfully achieved through RuPHOX-Ru catalyzed asymmetric hydrogenation, providing chiral azaflavanones and azaflavanols with high yields. The reaction can be performed on a gram-scale with low catalyst loading, allowing for various transformations. It has been demonstrated that the process is highly efficient through deuterium labelling and racemization experiments.
ORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Multidisciplinary
Jose A. Carmona, Patricia Rodriguez-Salamanca, Rosario Fernandez, Jose M. Lassaletta, Valentin Hornillos
Summary: An atroposelective Ir-catalyzed dynamic kinetic resolution (DKR) of 2-(quinolin-8-yl)benzaldehydes/1-naphthaldehydes is achieved by transfer hydrogenative coupling of allyl acetate. The reaction leads to the installation of central and axial chirality, with high diastereoselectivities and excellent enantioselectivities when ortho-cyclometalated iridium-DM-BINAP is used as the catalyst. The racemization of the substrates is facilitated through a designed transient Lewis acid-base interaction between the quinoline nitrogen atom and the aldehyde carbonyl group.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Organic
Yuting Feng, Peter Viereck, Shi-Guang Li, Youla S. Tsantrizos
Summary: An asymmetric Rh-catalyzed transfer hydrogenation method has been developed for the conversion of alpha-enamidophosphonates to alpha-aminophosphonates. This method is applicable to a variety of substrates and achieves high yields and enantiomeric excess.
Article
Chemistry, Multidisciplinary
Jingjing Li, Jianxun Ye, Jiayu Zhou, Jing Li, Delong Liu, Wanbin Zhang
Summary: The efficient RuPHOX-Ru catalyzed asymmetric hydrogenation of alpha-substituted tetralones via a dynamic kinetic resolution has been achieved for the synthesis of chiral tetrahydronaphthols. The mechanism study revealed that hydrogenation with H-2 gas is predominant in the reaction pathway compared to transfer hydrogenation with EtOH solvent as the hydrogen source.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Organic
Chandi C. Malakar, Luca Dell'Amico, Wanbin Zhang
Summary: Dual catalysis is a powerful strategy for chemical reactions in organic synthesis, with advantages such as increased reactivity, control of stereoselectivity, and stereodivergent synthesis. This Perspective aims to introduce the reader to the special collection on Dual Catalysis in EurJOC, summarizing the different categories of dual catalysis and demonstrating their benefits in constructing new chemical bonds selectively. It also presents current challenges and new trends in dual catalysis.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Correction
Chemistry, Multidisciplinary
Yunnan Xu, Yicong Luo, Jianxun Ye, Yu Deng, Delong Liu, Wanbin Zhang
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Applied
Jiayu Zhou, Jianxun Ye, Yang Zhang, Zhaodi Li, Jingjing Li, Delong Liu, Wanbin Zhang
Summary: The RuPHOX-Ru catalyzed asymmetric hydrogenation of diaryl ketones has been developed, yielding chiral diaryl methanols with up to 99% yield and 99% ee. This protocol can be performed on a gram-scale with low catalyst loading (2000 S/C) and the resulting products are valuable for various transformations, especially in the synthesis of chiral drugs like (S)-Orphenadrine and (S)-Neobenodine. Deuterium labeling and control experiments revealed that the RuPHOX-Ru-catalyzed asymmetric hydrogenation is exclusively driven by H-2 as the hydrogen source.
ADVANCED SYNTHESIS & CATALYSIS
(2023)
Article
Chemistry, Multidisciplinary
Tiantian Chen, Yashi Zou, Yanhua Hu, Zhenfeng Zhang, Hao Wei, Liangming Wei, Wanbin Zhang
Summary: An efficient asymmetric hydrogenation of internal simple enamides has been achieved using the diphosphine-cobalt-zinc catalytic system. The Ph-BPE ligand can achieve convergent asymmetric hydrogenation of E/Z-substrates. High yields and excellent enantioselectivities were obtained for different types of enamides. The hydrogenated products can be used for the synthesis of useful chiral drugs. Reasonable catalytic mechanism and stereocontrol mode are proposed based on DFT calculations.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Yu Nie, Qianjia Yuan, Wanbin Zhang
Summary: The design and synthesis of chiral ligands play a vital role in asymmetric catalytic reactions. Our group has developed a novel chiral PHOX ligand with an axis-unfixed biphenyl backbone, which exhibits interesting coordination behavior and excellent chiral inducing ability in various transition-metal-catalyzed asymmetric reactions. This personal account provides an overview of the design and applications of our developed BiphPHOX ligand, aiming to inspire the exploration of novel ligands and related reactions.
Article
Chemistry, Organic
Tanveer Ahmad, Feng Gao, Jing Li, Zhenfeng Zhang, Tao Song, Qianjia Yuan, Wanbin Zhang
Summary: TBAJ-587, an analogue of bedaquiline (BDQ), exhibits high bacterial potency, low toxicity, and improved pharmacokinetic profile compared to the parent molecule. The first asymmetric synthesis of TBAJ-587 using a synergistic Li/Li bimetallic system is reported, achieving a yield of 90% and an enantiomeric ratio of 80:20. This efficient synthesis method can be scaled up for clinical drug production.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Zhengxing Wu, Jingjie Meng, Huikang Liu, Yunyi Li, Xiao Zhang, Wanbin Zhang
Summary: In this study, a palladium-catalyzed aerobic oxidative method was developed for the multi-site programmable functionalization of terminal olefins. The reaction sequence between alkene isomerization and oxidative functionalization was controlled, and a variety of functionalized products were obtained, including unsaturated alcohols, polyalcohols, monosaccharides, and C-glycosides.
Article
Chemistry, Physical
Tao Song, Yicong Luo, Kuiyang Wang, Bingyi Wang, Qianjia Yuan, Wanbin Zhang
Summary: This research presents an efficient nickel-catalyzed remote hydroamination and hydroetherification method, which allows the installation of amino or alkoxyl groups at C(sp3)-H positions that are far from the double bond of alkenes. The yields are as high as 93% with exclusive regioselectivities.
Review
Chemistry, Organic
Jingjie Meng, Huikang Liu, Zhengxing Wu, Wanbin Zhang
Summary: Amines are widely used in the chemical and pharmaceutical industries, and research on synthetic methods for their preparation is driven by their importance. The amination of alkenes is a direct and efficient method for the construction of amines, with oxidative amination being more valuable due to its ability to produce products with greater functionality and flexibility. The use of molecular oxygen as a terminal oxidant in oxidative amination shows promising application prospects. Recent advancements in palladium-catalyzed aerobic oxidative amination of alkenes are discussed, with a focus on the oxidation process and associated mechanisms.
ASIAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Fei Li, Yicong Luo, Jinbao Ren, Qianjia Yuan, Deyue Yan, Wanbin Zhang
Summary: An iridium-catalyzed remote site-switchable hydroarylation of alkenes was reported, delivering functionalized products with good selectivities. The reaction showed excellent tolerance towards different functional groups and a wide substrate scope. Moreover, it successfully achieved the regioconvergent transformation of mixtures of isomeric alkenes.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Yicong Luo, Yuqi Ma, Guanlin Li, Xiaohong Huo, Wanbin Zhang
Summary: In this study, a Pd/Cu/Li ternary system has been developed for the stereodivergent synthesis of chiral fluorinated amino acids. By sequential desymmetrization and allylic substitution reactions, non-natural amino acids with excellent selectivity can be synthesized.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Organic
Tao Song, Kuiyang Wang, Qianjia Yuan, Wanbin Zhang
Summary: This study reports the nickel-catalyzed hydroamination and hydroalkoxylation reactions between unactivated amines and alcohols with enolactams. The method demonstrates good functional group tolerance and delivers the corresponding hydrofunctionalized products in good to excellent yields (& LE;98%). Additionally, an intramolecular hydroalkoxylation of an enolactam is successfully achieved, providing a cyclization product in good yield. Mechanistic studies reveal that tBuI plays crucial roles as a hydride donor and radical precursor for the reaction's success.
Editorial Material
Chemistry, Physical
Youbin Peng, Xiaohong Huo, Wanbin Zhang
Summary: In this article, Huang and co-workers describe a Pd-catalyzed stereodivergent [4 + 2] annulation reaction of alkylidene pyrazolones with vinyl benzoxazinanones via ligand regulation. The reaction produces an array of [6.5]-spiropyrazolones with three contiguous stereocenters in high yields and stereoselectivities. The origin of this stereodivergent annulation process was revealed by DFT calculation.
Article
Chemistry, Organic
Fei Li, Jinbao Ren, Yifan Song, Qianjia Yuan, Deyue Yan, Wanbin Zhang
Summary: In this study, an iridium-catalyzed 1,3-rearrangement of readily available allylic ethers was developed, providing access to allylic ethers with a large steric hindrance. The method exhibited a broad substrate scope and was applicable for the late-stage modification of several natural products. A possible reaction pathway was proposed based on control experiments.
Meeting Abstract
Oncology
Naval G. Daver, Andrew H. Wei, Eytan M. Stein, Daniel J. DeAngelo, Dhrubajyoti Pathak, Yunnan Xu, Stephanie Grzesiak, Adriano Venditti
CLINICAL LYMPHOMA MYELOMA & LEUKEMIA
(2022)