1
|
Lu HX, Wang C, Gao TT, Lin EZ, Lu SL, Hong X, Li BJ. Rhodium-Catalyzed Highly Enantioselective Hydroboration of Acyclic Tetrasubstituted Alkenes Directed by an Amide. J Am Chem Soc 2024; 146:16194-16202. [PMID: 38832699 DOI: 10.1021/jacs.4c04108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2024]
Abstract
Although progress has been made in enantioselective hydroboration of di- and trisubstituted alkenes over the past decades, enantioselective hydroboration of tetrasubstituted alkenes with high diastereo- and enantioselectivities continues as an unmet challenge since the 1950s due to its extremely low reactivity and the difficulties to simultaneously control the regio- and stereoselectivity of a tetrasubstituted alkene. Here, we report highly regio-, diastereo-, and enantioselective catalytic hydroboration of diverse acyclic tetrasubstituted alkenes. The delicate interplay of an electron-rich rhodium complex and coordination-assistance forms a highly adaptive catalyst that effectively overcomes the low reactivity and controls the stereoselectivity. The generality of the catalyst system is exemplified by its efficacy across various tetrasubstituted alkenes with diverse steric and electronic properties.
Collapse
Affiliation(s)
- Hou-Xiang Lu
- Center of Basic Molecular Science (CBMS), Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Cheng Wang
- Center of Chemistry for Frontier Technologies, Department of Chemistry, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Tao-Tao Gao
- Center of Basic Molecular Science (CBMS), Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - En-Ze Lin
- Center of Basic Molecular Science (CBMS), Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Shou-Lin Lu
- Center of Basic Molecular Science (CBMS), Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Xin Hong
- Center of Chemistry for Frontier Technologies, Department of Chemistry, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
- Beijing National Laboratory for Molecular Sciences, Zhongguancun North First Street No. 2, Beijing 100190, China
| | - Bi-Jie Li
- Center of Basic Molecular Science (CBMS), Department of Chemistry, Tsinghua University, Beijing 100084, China
- Engineering Research Center of Advanced Rare Earth Materials (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, China
| |
Collapse
|
2
|
Bonner A, Baumann M. Development of a Continuous Flow Baldwin Rearrangement Process and Its Comparison to Traditional Batch Mode. Org Process Res Dev 2024; 28:1567-1575. [PMID: 38783852 PMCID: PMC11110046 DOI: 10.1021/acs.oprd.3c00213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Indexed: 05/25/2024]
Abstract
A new and highly efficient continuous flow process is presented for the synthesis of aziridines via the thermal Baldwin rearrangement. The process was initially explored using traditional batch synthesis techniques but suffered from moderate yields, long reaction times, and moderate diastereoselectivities. Here we demonstrate that the process can be greatly improved upon its transfer to continuous flow, which afforded the aziridine targets in high yields, short reaction times, and consistently high diastereoselectivities, with the high-throughput process rendering multigram quantities of product in short periods of time. In addition, flow processing extended the substrate scope including several examples that had failed in batch mode, thus demonstrating the value of this overlooked entry into valuable aziridine species.
Collapse
Affiliation(s)
- Arlene Bonner
- School
of Chemistry, University College Dublin, Science Centre South, Belfield, Dublin 4, Ireland D04 N2E2
| | - Marcus Baumann
- School
of Chemistry, University College Dublin, Science Centre South, Belfield, Dublin 4, Ireland D04 N2E2
| |
Collapse
|
3
|
Huang Y, Zhu SY, He G, Chen G, Wang H. Synthesis of N-H Aziridines from Unactivated Olefins Using Hydroxylamine- O-Sulfonic Acids as Aminating Agent. J Org Chem 2024; 89:6263-6273. [PMID: 38652889 DOI: 10.1021/acs.joc.4c00253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
Herein, we presented a practical methodology for the intermolecular aziridination of alkenes, using HOSA as the aminating agent, alongside pyridine or piperidine as the base, within HFIP solvent system. Notably, this approach showcases excellent reactivity, especially with nonactivated alkenes, and facilitates the transformation of various alkenes substrates, including mono-, di-, tri, and tetra-substituted alkenes, into aziridines with moderate to excellent yield. This method presents a promising avenue for synthesizing aziridines from a wide range of alkenes, featuring the benefits of straightforward operation, mild reaction conditions, extensive substrate compatibility, and scalability.
Collapse
Affiliation(s)
- Yi Huang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Shi-Yang Zhu
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Gang He
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Gong Chen
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Hao Wang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| |
Collapse
|
4
|
Mitchell J, Hussain WA, Bansode AH, O’Connor RM, Parasram M. Aziridination via Nitrogen-Atom Transfer to Olefins from Photoexcited Azoxy-Triazenes. J Am Chem Soc 2024; 146:9499-9505. [PMID: 38522088 PMCID: PMC11009954 DOI: 10.1021/jacs.3c14713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 03/14/2024] [Accepted: 03/15/2024] [Indexed: 03/26/2024]
Abstract
Herein, we report that readily accessible azoxy-triazenes can serve as nitrogen atom sources under visible light excitation for the phthalimido-protected aziridination of alkenes. This approach eliminates the need for external oxidants, precious transition metals, and photocatalysts, marking a departure from conventional methods. The versatility of this transformation extends to the selective aziridination of both activated and unactivated multisubstituted alkenes of varying electronic profiles. Notably, this process avoids the formation of competing C-H insertion products. The described protocol is operationally simple, scalable, and adaptable to photoflow conditions. Mechanistic studies support the idea that the photofragmentation of azoxy-triazenes results in the generation of a free singlet nitrene. Furthermore, a mild photoredox-catalyzed N-N cleavage of the protecting group to furnish the free aziridines is reported. Our findings contribute to the advancement of sustainable and practical methodologies for the synthesis of nitrogen-containing compounds, showcasing the potential for broader applications in synthetic chemistry.
Collapse
Affiliation(s)
- Joshua
K. Mitchell
- Department of Chemistry, New
York University, New York, New York 10003, United States
| | - Waseem A. Hussain
- Department of Chemistry, New
York University, New York, New York 10003, United States
| | - Ajay H. Bansode
- Department of Chemistry, New
York University, New York, New York 10003, United States
| | - Ryan M. O’Connor
- Department of Chemistry, New
York University, New York, New York 10003, United States
| | - Marvin Parasram
- Department of Chemistry, New
York University, New York, New York 10003, United States
| |
Collapse
|
5
|
Roy S, Vargas DA, Ma P, Sengupta A, Zhu L, Houk KN, Fasan R. Stereoselective Construction of β-, γ-, and δ-Lactam Rings via Enzymatic C-H Amidation. Nat Catal 2024; 7:65-76. [PMID: 38584987 PMCID: PMC10997382 DOI: 10.1038/s41929-023-01068-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 10/23/2023] [Indexed: 04/09/2024]
Abstract
Lactam rings are found in many biologically active natural products and pharmaceuticals, including important classes of antibiotics. Methods for the asymmetric synthesis of these molecules are therefore highly desirable, particularly through the selective functionalization of unreactive aliphatic C-H bonds. Here we show the development of a strategy for the asymmetric synthesis of β-, γ-, and δ-lactams via hemoprotein-catalysed intramolecular C-H amidation reaction with readily available dioxazolone reagents. Engineered myoglobin variants serve as excellent biocatalysts for this transformation yielding the desired lactam products in high yields, high enantioselectivity, and on preparative scale. Mechanistic and computational studies elucidate the nature of the C-H amination and enantiodetermining steps and provide insights into protein-mediated control of regioselectivity and stereoselectivity. Additionally, an alkaloid natural product and a drug molecule were synthesized chemoenzymatically in much fewer steps (7-8 vs. 11-12) than previously reported, further demonstrating the power of biosynthetic strategy for the preparation of complex bioactive molecules.
Collapse
Affiliation(s)
- Satyajit Roy
- Department of Chemistry, University of Rochester, 120 Trustee Road, Rochester, New York, 14627, United States
- Current affiliation: Department of Chemistry and Biochemistry, University of Texas at Dallas, 800 W. Campbell Road, Richardson, TX 75080, United States
| | - David A. Vargas
- Department of Chemistry, University of Rochester, 120 Trustee Road, Rochester, New York, 14627, United States
- Current affiliation: Process Research and Development, Merck & Co., Inc., Rahway, NJ, 07065, USA
| | - Pengchen Ma
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California, 90095, United States
- School of Chemistry, Xi’an Key Laboratory of Sustainable Energy Materials Chemistry, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi’an Jiaotong University, Xi’an, China
| | - Arkajyoti Sengupta
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California, 90095, United States
| | - Ledong Zhu
- Environment Research Institute, Shandong University, Qingdao 266237, PR China
| | - K. N. Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California, 90095, United States
| | - Rudi Fasan
- Department of Chemistry, University of Rochester, 120 Trustee Road, Rochester, New York, 14627, United States
- Current affiliation: Department of Chemistry and Biochemistry, University of Texas at Dallas, 800 W. Campbell Road, Richardson, TX 75080, United States
| |
Collapse
|
6
|
Tufano E, Lee E, Barilli M, Casali E, Oštrek A, Jung H, Morana M, Kang J, Kim D, Chang S, Zanoni G. Iridium Acylnitrenoid-Initiated Biomimetic Cascade Cyclizations: Stereodefined Access to Polycyclic δ-Lactams. J Am Chem Soc 2023. [PMID: 37926946 DOI: 10.1021/jacs.3c08331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2023]
Abstract
Ring-fused azacyclic compounds are important building units in the synthesis of biorelevant natural products, pharmaceutical agents, and molecular materials. Herein, we present a new approach to these condensed azacycles by a biomimetic cascade cyclization of arylalkenyl dioxazolones. This cascade reaction was found to proceed with excellent stereoselectivity and a high functional group tolerance. The substrate scope of arylalkenyl dioxazolones turned out to be highly flexible and extendable to additional terminating subunits, such as heteroaryl and alkynyl moieties. This biomimetic cyclization was elucidated to be initiated by an intramolecular transfer of the in situ generated electrophilic Ir-acylnitrenoid to the tethered olefinic double bond, leading to a key N-acylaziridine intermediate, which is in turn reacted with pendant (hetero)arenes or alkynes in a highly regio- and stereoselective manner to produce ring-fused azacyclic compounds.
Collapse
Affiliation(s)
- Eleonora Tufano
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Euijae Lee
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, Korea
| | - Matteo Barilli
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Emanuele Casali
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Andraž Oštrek
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Hoimin Jung
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, Korea
| | - Marta Morana
- Department of Earth Science, University of Firenze, Via G. La Pira 4, 50121 Firenze, Italy
| | - Jihye Kang
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, Korea
| | - Dongwook Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, Korea
| | - Sukbok Chang
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, Korea
| | - Giuseppe Zanoni
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| |
Collapse
|
7
|
Wang S, Wang P, Li SJ, Chen YH, Sun ZJ, Lei A. Electrochemical flow aziridination of unactivated alkenes. Natl Sci Rev 2023; 10:nwad187. [PMID: 38059062 PMCID: PMC10697417 DOI: 10.1093/nsr/nwad187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2022] [Revised: 06/23/2023] [Accepted: 06/26/2023] [Indexed: 12/08/2023] Open
Abstract
Aziridines derived from bioactive molecules may have unique pharmacological activities, making them useful in pharmacology (e.g. mitomycin C). Furthermore, the substitution of the epoxide moiety in epothilone B with aziridine, an analog of epoxides, yielded a pronounced enhancement in its anticancer efficacy. Thus, there is interest in developing novel synthetic technologies to produce aziridines from bioactive molecules. However, known methods usually require metal catalysts, stoichiometric oxidants and/or pre-functionalized amination reagents, causing difficulty in application. A practical approach without a metal catalyst and extra-oxidant for the aziridination of bioactive molecules is in demand, yet challenging. Herein, we report an electro-oxidative flow protocol that accomplishes an oxidant-free aziridination of natural products. This process is achieved by an oxidative sulfonamide/alkene cross-coupling, in which sulfonamide and alkene undergo simultaneous oxidation or alkene is oxidized preferentially. Further anticancer treatments in cell lines have demonstrated the pharmacological activities of these aziridines, supporting the potential of this method for drug discovery.
Collapse
Affiliation(s)
- Shengchun Wang
- Institute for Advanced Studies (IAS), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430079, China
| | - Pengjie Wang
- Institute for Advanced Studies (IAS), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430079, China
| | - Shu-Jin Li
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, China
| | - Yi-Hung Chen
- Institute for Advanced Studies (IAS), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430079, China
| | - Zhi-Jun Sun
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, China
- Department of Oral Maxillofacial-Head Neck Oncology, School and Hospital of Stomatology, Wuhan University, Wuhan 430079, China
| | - Aiwen Lei
- Institute for Advanced Studies (IAS), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430079, China
| |
Collapse
|
8
|
Chu D, Ellman JA. Stereospecific Synthesis of Unprotected, α,β-Disubstituted Tryptamines and Phenethylamines from 1,2-Disubstituted Alkenes via a One-Pot Reaction Sequence. Org Lett 2023; 25:3654-3658. [PMID: 37172224 PMCID: PMC10239558 DOI: 10.1021/acs.orglett.3c01021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Unprotected, α,β-disubstituted tryptamines and phenethylamines are obtained by a one-pot, metal-free sequence that proceeds by the in situ formation of aziridinium salts followed by Friedel-Crafts reaction with electron-rich (hetero)arenes. Both steps are facilitated by hexafluoroisopropanol as the solvent. The one-pot sequence was effective for diversely substituted indoles and 1,3,5-trimethoxybenzene, for cyclic and acyclic alkenes, and proceeded in a stereospecific fashion for both (E)- and (Z)-1,2-disubstituted alkenes. Moreover, one-pot morpholine addition to an aziridinium salt provided a diamine.
Collapse
Affiliation(s)
- Duc Chu
- Department of Chemistry, Yale University, New Haven, CT 04720, USA
| | | |
Collapse
|
9
|
Wang J, Lin Z, Zheng Z, Xiao R, Zheng K. Theoretical Study on Ir-Catalyzed α-Amidation of 2-Acylimidazoles: Mechanism and Insertion Selectivity. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Juping Wang
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, P. R. China
| | - Zijie Lin
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, P. R. China
| | - Zhenjie Zheng
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, P. R. China
| | - Rongxing Xiao
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, P. R. China
| | - Kangcheng Zheng
- School of Chemistry, Sun Yat-sen University, Guangzhou 510275, P. R. China
| |
Collapse
|
10
|
Liu M, Du H, Cui J, Shu W. Intermolecular Metal‐Free Cyclopropanation and Aziridination of Alkenes with XH
2
(X=N, C) by Thianthrenation**. Angew Chem Int Ed Engl 2022; 61:e202209929. [DOI: 10.1002/anie.202209929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Indexed: 11/08/2022]
Affiliation(s)
- Ming‐Shang Liu
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518055 Guangdong P.R. China
| | - Hai‐Wu Du
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518055 Guangdong P.R. China
| | - Jian‐Fang Cui
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518055 Guangdong P.R. China
| | - Wei Shu
- Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and Technology Shenzhen 518055 Guangdong P.R. China
- State Key Laboratory of Elemento-Organic Chemistry Nankai University 300071 Tianjin P.R. China
| |
Collapse
|
11
|
Liu MS, Du HW, Cui JF, Shu W. Intermolecular Metal‐Free Cyclopropanation and Aziridination of Alkenes with XH2 (X = N, C) by Thianthrenation. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202209929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ming-Shang Liu
- Southern University of Science and Technology Chemistry CHINA
| | - Hai-Wu Du
- Southern University of Science and Technology Chemistry CHINA
| | - Jian-Fang Cui
- Southern University of Science and Technology Chemistry CHINA
| | - Wei Shu
- Southern University of Science and Technology Chemistry Room 5-505, 1088 Xueyuan Road 518055 Shenzhen CHINA
| |
Collapse
|
12
|
Zhao Q, Yao QY, Zhang YJ, Xu T, Zhang J, Chen X. Selective Cyclopropanation/Aziridination of Olefins Catalyzed by Bis(pyrazolyl)borate Cu(I) Complexes. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Qianyi Zhao
- Henan Normal University School of Chemistry and Chemical Engineering Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials Jianshe Road 453007 Xinxiang CHINA
| | - Qiu-Yue Yao
- Henan Normal University School of Chemistry and Chemical Engineering Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials CHINA
| | - Yan-Jiao Zhang
- Henan Normal University School of Chemistry and Chemical Engineering Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials CHINA
| | - Ting Xu
- Henan Normal University School of Chemistry and Chemical Engineering Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials CHINA
| | - Jie Zhang
- Henan Normal University School of Chemistry and Chemical Engineering Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials CHINA
| | - Xuenian Chen
- Henan Normal University School of Chemistry and Chemical Engineering Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials CHINA
| |
Collapse
|
13
|
Zheng F, Zhou J, Fang F, Li J, Wang J, Zheng M, Liu H, Xu Y, Zhou Y. Rh(III)-Catalyzed C-H Activation and [4+1+1] Sequential Cyclization Cascade to Give Highly Fused Indano[1,2- b]azirines. Org Lett 2022; 24:5688-5692. [PMID: 35921178 DOI: 10.1021/acs.orglett.2c02070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A Rh(III)-catalyzed C-H activation of α-keto oximes and a cyclization cascade with diazo compounds were developed to construct the highly fused indano[1,2-b]azirine frameworks in good yields with a broad range of substrates under mild reaction conditions. More intriguingly, a [4+1+1] sequential annulation cascade is demonstrated for the first time in this reaction and opened a new reaction mode for α-keto oximes. These fused indano[1,2-b]azirine derivatives could also be further transformed into intriguing privileged drug scaffolds.
Collapse
Affiliation(s)
- Fuqiang Zheng
- Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing 210009, China.,State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai 201203, China
| | - Jianhui Zhou
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai 201203, China
| | - Feifei Fang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai 201203, China
| | - Jiyuan Li
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai 201203, China
| | - Jing Wang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai 201203, China
| | - Miao Zheng
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai 201203, China
| | - Hong Liu
- Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing 210009, China.,State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai 201203, China.,School of Pharmaceutical Science and Technology, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
| | - Yungen Xu
- Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing 210009, China
| | - Yu Zhou
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai 201203, China.,School of Pharmaceutical Science and Technology, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
| |
Collapse
|
14
|
Tan H, Samanta S, Maity A, Roychowdhury P, Powers DC. N-Aminopyridinium reagents as traceless activating groups in the synthesis of N-Aryl aziridines. Nat Commun 2022; 13:3341. [PMID: 35689000 PMCID: PMC9187731 DOI: 10.1038/s41467-022-31032-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 05/30/2022] [Indexed: 12/11/2022] Open
Abstract
N-functionalized aziridines, which are both useful intermediates and important synthetic targets, can be envisioned as arising from the addition of nitrenes (i.e., NR fragments) to olefinic substrates. The exceptional reactivity of most nitrenes, in particular with respect to unimolecular decomposition, prevents general application of nitrene-transfer to the synthesis of N-functionalized aziridines. Here we demonstrate N-aryl aziridine synthesis via 1) olefin aziridination with N-aminopyridinium reagents to afford N-pyridinium aziridines followed by 2) Ni-catalyzed C-N cross-coupling of the N-pyridinium aziridines with aryl boronic acids. The N-pyridinium aziridine intermediates also participate in ring-opening chemistry with a variety of nucleophiles to afford 1,2-aminofunctionalization products. Mechanistic investigations indicate aziridine cross-coupling proceeds via a noncanonical mechanism involving initial aziridine opening promoted by the bromide counterion of the Ni catalyst, C-N cross-coupling, and finally aziridine reclosure. Together, these results provide new opportunities to achieve selective incorporation of generic aryl nitrene equivalents in organic molecules.
Collapse
Affiliation(s)
- Hao Tan
- Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - Samya Samanta
- Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - Asim Maity
- Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - Pritam Roychowdhury
- Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - David C Powers
- Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA.
| |
Collapse
|