Article
Chemistry, Organic
Dezhi Yang, Meng Zhu, Taimin Wang, Yixuan He, Lang Xie, Jiayong Zhang, Bin Cheng
Summary: A catalyst-free and additive-free reaction was developed for the inverse-electron-demand aza-Diels-Alder reaction between 4,4-dicyano-2-methylenebut-3-enoates and 1,3,5-triazinanes, providing a highly convenient method to construct polyfunctionalized tetrahydropyridines in high yields. This strategy exhibits advantages such as high efficiency, good functional group tolerance, broad substrate scope, and environmentally friendly conditions.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2023)
Article
Chemistry, Physical
Pilar Elias-Rodriguez, Ana T. Carmona, Antonio J. Moreno-Vargas, Inmaculada Robina
Summary: In this study, iminosugar derivatives containing a pyrrolidine-phosphine moiety were synthesized and used as catalysts in the [3 + 2] cycloaddition reaction between alkyl allenoates and electron-deficient imines. The results demonstrated that under appropriate conditions, 1,2,3,5-tetrasubstituted pyrrolines with high yields and good diastereoselectivities were obtained.
Article
Chemistry, Organic
Xinyu Liu, Zhixin Liu, Yongyi Hu, Kuo-Wei Huang, Manjaly J. Ajitha, De Wang
Summary: A novel alpha,beta-regioselective [3+2] cycloaddition reaction of arylallene with C,N-cyclic azomethine imine is reported. The axial-to-central chirality transfer phenomenon has been disclosed with chiral allenes in the reaction. The wide substrate scope, including different functional groups and natural products, reveals the generality of the methodology. Both experiments and density functional theory calculations have been used to elucidate a plausible mechanism.
Article
Chemistry, Organic
Jie-Hui Zhang, Cheng-Lin Pan, Huan-Huan Zhang, Peng-Fei Xu, Yong-Chun Luo
Summary: A Sc(OTf)3 catalyzed [3 + 2]-annulation reaction has been developed for the conversion of donor-acceptor aziridines and exo-glycals into carbohydrate-spiro-heterocycles, yielding proline analogues and polycyclic compounds. This reaction also revealed the stereochemistry characteristic of the reaction between racemic D-A aziridines and chiral enolethers.
ORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Multidisciplinary
Binghui Wang, Yilin Liu, Chenyang Jiang, Zheng Cao, Shanshan Cao, Xiaowei Zhao, Xu Ban, Yanli Yin, Zhiyong Jiang
Summary: Describes a chiral Bronsted acid-catalysed asymmetric hydrophosphinylation of 2-vinylazaarenes by secondary phosphine oxides. P-chiral 2-azaaryl-ethylphosphine oxides are synthesized with high yields and ees, allowing for flexible modulation of substituents. The resulting P-chiral tertiary phosphines from the reduction are confirmed as effective C-1-symmetric chiral 1,5-hybrid P,N-ligands, making these adducts valuable in asymmetric metal catalysis.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Organic
Henning J. Loui, Arun Suneja, Christoph Schneider
Summary: A synthetic method has been developed for the stereoselective (3 + 3)-cycloannulation of in situ generated carbonyl ylides with indolyl-2-methides, resulting in oxa-bridged azepino[1,2-a]indoles in one step. The products, with three stereogenic centers, were obtained with good stereoselectivity and yields, showcasing valuable heterocyclic complexity.
Article
Chemistry, Multidisciplinary
Yu-Qing Xiao, Miao-Miao Li, Zheng-Xin Zhou, Yu-Jie Li, Meng-Yue Cao, Xiao-Peng Liu, Hai-Hua Lu, Li Rao, Liang-Qiu Lu, Andre M. Beauchemin, Wen-Jing Xiao
Summary: This article describes a palladium-catalyzed highly diastereo- and enantioselective (3+2) cycloaddition reaction, which successfully synthesizes a variety of chiral five-membered heterocycles. The key to the success of this reaction is the remote stereoinduction through hydrogen bond, addressing the challenge of generating chiral quaternary stereocenters using substrates with two different acceptors.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Kai-Qiang Zhang, Qi-Fu Deng, Jie Luo, Chu-Liang Gong, Zhi-Gang Chen, Wei Zhong, Shun-Qin Hu, Hai-Fei Wang
Summary: This study successfully developed an asymmetric [3+2] cycloaddition reaction catalyzed by a multifunctional Ag(I)/CAAA-amidphos complex, enabling the high-yield synthesis of chiral pyrrolidines with quaternary stereocenters and bridged dinitrogen heterocycles with excellent enantioselectivity.
Article
Chemistry, Multidisciplinary
Sundaravel Vivek Kumar, Patrick J. Guiry
Summary: We have developed a facile synthetic route for a novel series of imidazolinyl-[2.2]paracyclophanol (UCD-Imphanol) ligands with central and planar chirality. These ligands showed excellent activities and selectivities in asymmetric reactions, leading to enantioenriched pyrrolidines with high yields.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Organic
Guo-Li Chai, En-Ze Yao, Rui-Hao Liu, Junbiao Chang
Summary: In this study, a new catalytic system was reported for the synthesis of N,N'-bicyclic pyrazolidine derivatives with high stereoselectivity. The reaction conditions are mild and efficient, with a broad substrate scope.
Article
Chemistry, Organic
Siming Jia, Mengmeng Ma, Er-Qing Li, Zheng Duan, Francis Mathey
Summary: Two novel diastereoisomeric P-chirogenic phosphine catalysts, JiaPhos, were successfully synthesized from inexpensive starting materials in five chemical operations on a 4.16g scale. These catalysts demonstrated excellent performance in enantioselective (4 + 2) annulations, providing a diverse range of 3,3'-spirocyclic oxindoles with high efficiency and enantioselectivity.
Article
Chemistry, Multidisciplinary
Nicolaj Inunnguaq Jessen, Maksimilian Bura, Giulio Bertuzzi, Karl Anker Jorgensen
Summary: An efficient and stereoselective synthesis of chiral cycl[3.2.2]azines has been achieved through the rational design and utilization of novel (E)-3-benzylidene-3H-pyrrolizines in iminium-ion catalysis. The method allows for incorporation of diverse enals and the obtained products can undergo selective transformations while retaining stereochemical information established in the [8+2] cycloaddition.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Tsukasa Tawatari, Ritsuki Kato, Riku Kudo, Kiyosei Takasu, Hiroshi Takikawa
Summary: In this study, we report on the intramolecular (3+2) cycloaddition reactions between ynamides and benzyne. These reactions involve the formation of two bonds and are facilitated by using benzyne precursors containing a chlorosilyl group. The intermediate indolium ylide in these reactions exhibits both nucleophilic and electrophilic properties at its C2 atom.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Organic
Yue Ren, Wangyu Shi, Yi Tang, Shixiang Piao, Songcheng Yu, Yongjun Wu, Hongchao Guo
Summary: A series of gamma-substituted MBH carbonates were synthesized and reacted with electrophilic exocyclic alkenes through phosphine-catalyzed annulations, resulting in the formation of valuable spirocyclopentenes with moderate to excellent yields and diastereoselectivities. The annulation process tolerates a wide range of MBH carbonates with gamma-hydrogen, alkenyl, and alkynyl substituents. Notably, this annulation involves the beta, gamma, and delta carbons of MBH carbonates, which is unprecedented.
Article
Chemistry, Applied
Xiao-Ting Qin, Ning Zou, Xiao-Ling Cheng, Cui Liang, Dong-Liang Mo
Summary: A variety of chiral nine-membered N-heterocycles were prepared in moderate to good yields with high diastereoselectivity through a silver(I)-catalyzed reaction. Experimental studies showed that the silver catalyst promoted the cycloaddition and rearrangement process, and controlled the stereochemistry of the products.
ADVANCED SYNTHESIS & CATALYSIS
(2022)
Article
Chemistry, Multidisciplinary
Yu Lei, Xiao-Nan Zhang, Xue-Yan Yang, Qin Xu, Min Shi
Article
Chemistry, Multidisciplinary
Gen-Qiang Chen, Xiao-Nan Zhang, Yin Wei, Xiang-Ying Tang, Min Shi
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2014)
Article
Chemistry, Multidisciplinary
Yuan-Liang Yang, Zhen Zhang, Xiao-Nan Zhang, De Wang, Yin Wei, Min Shi
CHEMICAL COMMUNICATIONS
(2014)
Article
Chemistry, Organic
Xiao-Nan Zhang, Xiang Dong, Yin Wei, Min Shi
Article
Multidisciplinary Sciences
Xiao-Nan Zhang, Qinqin Cheng, Jingwen Chen, Albert T. Lam, Yanran Lu, Zhefu Dai, Hua Pei, Nikolai M. Evdokimov, Stan G. Louie, Yong Zhang
NATURE COMMUNICATIONS
(2019)
Article
Multidisciplinary Sciences
Zhefu Dai, Xiao-Nan Zhang, Fariborz Nasertorabi, Qinqin Cheng, Jiawei Li, Benjamin B. Katz, Goar Smbatyan, Hua Pei, Stan G. Louie, Heinz-Josef Lenz, Raymond C. Stevens, Yong Zhang
Article
Biochemistry & Molecular Biology
Albert T. Lam, Xiao-Nan Zhang, Valentine V. Courouble, Timothy S. Strutzenberg, Hua Pei, Bangyan L. Stiles, Stan G. Louie, Patrick R. Griffin, Yong Zhang
Summary: Protein poly-ADP-ribosylation is a heterogeneous and dynamic post-translational modification regulated by various factors, participating in biological events and human diseases. Currently, tools are lacking for clearly defining readers and erasers of PARylated proteins. The newly developed bifunctional NAD(+) serves as an important tool for studying cellular interaction networks centered on protein PARylation.
ACS CHEMICAL BIOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Zhefu Dai, Xiao-Nan Zhang, Qinqin Cheng, Fan Fei, Tianling Hou, Jiawei Li, Alireza Abdolvahabi, Junji Watanabe, Hua Pei, Goar Smbatyan, Jianming Xie, Heinz-Josef Lenz, Stan G. Louie, Yong Zhang
Summary: A new technology for producing homogeneous ADCs, ARC-ADCs, was developed by utilizing the human CD38 catalytic domain and its derived inhibitor. Through this technology, ADCs with customizable drug-to-antibody ratios (DARs) can be rapidly generated, showing potent activity in killing hCLL-1-positive AML cells. This work provides novel ADC candidates for combating AML and supports ARC-ADC as a versatile approach for producing site-specific ADCs with defined DARs.
JOURNAL OF CONTROLLED RELEASE
(2021)
Article
Chemistry, Multidisciplinary
Xiao-Nan Zhang, Albert T. Lam, Qinqin Cheng, Valentine V. Courouble, Timothy S. Strutzenberg, Jiawei Li, Yiling Wang, Hua Pei, Bangyan L. Stiles, Stan G. Louie, Patrick R. Griffin, Yong Zhang
Summary: Researchers have reported a synthetic NAD(+) compound featuring high activity and specificity for human PARP1, which can be used as an ADP-ribose donor to label and analyze potential protein substrates of endogenous PARP1.
Article
Biochemistry & Molecular Biology
Qinqin Cheng, Xiao-Nan Zhang, Lei Zhang, Jingwen Chen, Yiling Wang, Yong Zhang
Summary: This study generated PAR polymer-GCSF conjugates through the combination of PAR polymers and human granulocyte colony-stimulating factor (GCSF) protein, which demonstrated excellent in vivo efficacy and have the potential to be used as carriers for therapeutic proteins or peptides with improved pharmacological activities.
Article
Biochemistry & Molecular Biology
Yong Zhang, Qinqin Cheng, Xiao-Nan Zhang, Jiawei Li, Jingwen Chen, Yiling Wang
Summary: In this study, a PAR polymer-based bispecific antibody targeting both HER2 and T-cell CD3 antigens was developed. The conjugate had specific binding to target cells expressing HER2 and CD3, and exhibited potent cytotoxicity against HER2-positive breast cancer cells in the presence of non-activated PBMCs. Functionalized PAR polymers provide a new strategy for synthesizing bispecific antibodies with unique pharmacological activities for biomedical applications.
Article
Chemistry, Multidisciplinary
Elisa N. Stephens, Xiao-Nan Zhang, Albert T. Lam, Jiawei Li, Hua Pei, Stan G. Louie, Clay C. C. Wang, Yong Zhang
Summary: The article presents a novel ribose-functionalized NAD(+) with versatile activities that can serve as a general substrate for poly-ADP-ribose polymerases. The mono- and poly-ADP-ribosylated proteins derived from this molecule can be recognized by specific ADP-ribosylation readers, providing valuable insights into developing new probes for ADP-ribosylation.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Xiaojing Shi, Xiao-Nan Zhang, Jingwen Chen, Qinqin Cheng, Hua Pei, Stan G. Louie, Yong Zhang
Article
Chemistry, Physical
Yao-Liang Sun, Xiao-Nan Zhang, Yin Wei, Min Shi
Article
Chemistry, Multidisciplinary
Zhefu Dai, Xiao-Nan Zhang, Fariborz Nasertorabi, Qinqin Cheng, Hua Pei, Stan G. Louie, Raymond C. Stevens, Yong Zhang