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Hou H, Guo S, Shen X, Chen C, Chen X, Yu H, Han Y, Sun Q, Zhu S. Site-Specific Radical Alkylation of Aryl Cyanide: Visible-Light, Photoredox-Catalyzed, Three-Component Arylalkylation of [1.1.1]Propellane. Org Lett 2024; 26:7769-7773. [PMID: 39230003 DOI: 10.1021/acs.orglett.4c02969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/05/2024]
Abstract
We report herein a three-component radical arylalkylation of [1.1.1]propellane toward the synthesis of aryl-substituted bicyclo[1.1.1]pentane derivatives. The use of electron-deficient aryl cyanide as an aryl group source not only reduces the energy barrier of the arylation of the nucleophilic alkyl radical species, but also suppresses the electrophilic Friedel-Crafts alkylation process, enabling the present site-selective arylalkylation.
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Affiliation(s)
- Hong Hou
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225009, China
| | - Shengkun Guo
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225009, China
| | - Xiaoyu Shen
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225009, China
| | - Chengjun Chen
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225009, China
| | - Xiaoyun Chen
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212005, China
| | - Huaguang Yu
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, College of Optoelectronic Materials and Technology, Jianghan University, Wuhan 430056, China
| | - Ying Han
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225009, China
| | - Qiu Sun
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225009, China
| | - Shaoqun Zhu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225009, China
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2
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Ren H, Li T, Xing J, Li Z, Zhang Y, Yu X, Zheng J. Ti-Catalyzed Formal [2π + 2σ] Cycloadditions of Bicyclo[1.1.0]butanes with 2-Azadienes to Access Aminobicyclo[2.1.1]hexanes. Org Lett 2024; 26:1745-1750. [PMID: 38377354 DOI: 10.1021/acs.orglett.4c00421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
Saturated bicyclic amines are increasingly targeted to the pharmaceutical industry as sp3-rich bioisosteres of anilines. Numerous strategies have been established for the preparation of bridgehead aminobicyclics. However, methods to assemble the bridge-amino hydrocarbon skeleton, which serves as a meta-substituted arene bioisostere, are limited. Herein, a general approach to access 2-aminobicyclo[2.1.1]hexanes (aminoBCHs) by titanium-catalyzed formal [2π + 2σ] cycloaddition of bicyclo[1.1.0]butanes and 2-azadienes was developed. Simple derivatization of aminoBCHs leads to various medicinally and agrochemically important analogues.
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Affiliation(s)
- Haosong Ren
- Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, P. R. China
| | - Tianxiang Li
- Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, P. R. China
| | - Jinping Xing
- Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, P. R. China
| | - Zhenyue Li
- Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, P. R. China
| | - Yanxia Zhang
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. China
| | - Xinhong Yu
- Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, P. R. China
| | - Jun Zheng
- Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, P. R. China
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3
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Li Z, Lan D, Zhou W, Li J, Zhu H, Yu C, Jiang X. Synthesis of C3-halo substituted bicyclo[1.1.1]pentylamines via halosulfoamidation of [1.1.1]propellane with sodium hypohalites and sulfonamides. Chem Commun (Camb) 2023; 59:6056-6059. [PMID: 37114292 DOI: 10.1039/d3cc01262j] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
Herein, we report a catalyst-free synthesis of C3-halo substituted bicyclo[1.1.1]pentylamines under mild conditions. The reaction involves the use of sodium hypohalites and sulfonamides to generate N-halosulfonamides in situ, which subsequently undergo radical addition with [1.1.1]propellane to yield the desired products with suitable functional group tolerance.
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Affiliation(s)
- Zhi Li
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, P. R. China.
| | - Deyou Lan
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, P. R. China.
| | - Wei Zhou
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, P. R. China.
| | - Jiacheng Li
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, P. R. China.
| | - Hui Zhu
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, P. R. China.
| | - Chuanming Yu
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, P. R. China.
| | - Xinpeng Jiang
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, P. R. China.
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4
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Alonso M, Cañellas S, Delgado F, Serrano M, Diéguez-Vázquez A, Gómez JE. Accelerated Synthesis of Bicyclo[1.1.1]pentylamines: A High-Throughput Approach. Org Lett 2023; 25:771-776. [PMID: 36724762 DOI: 10.1021/acs.orglett.2c04226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Strained bicyclic substructures such as bicyclo[1.1.1]pentylamines (BCPAs) are increasingly targeted in medicinal chemistry as arylamine bioisosteres. Here, we leverage high-throughput automated synthesis to rapidly develop library-amenable reaction conditions and maximize design space to expand access to BCPAs. This new protocol relies on a copper-mediated C-N coupling approach and uses accessible and bench-stable iodo-BCP building blocks. Its applicability has been exemplified by incorporating BCPs in drug-like compounds, providing straightforward access to a library of valuable aniline-like isosteres.
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Affiliation(s)
- Maialen Alonso
- Chemical Capabilities, Analytical & Purification, Global Discovery Chemistry, Janssen Research and Development, Janssen-Cilag, S.A., C/Jarama 75A, E-45007 Toledo, Spain
| | - Santiago Cañellas
- Chemical Capabilities, Analytical & Purification, Global Discovery Chemistry, Janssen Research and Development, Janssen-Cilag, S.A., C/Jarama 75A, E-45007 Toledo, Spain
| | - Francisca Delgado
- Chemical Capabilities, Analytical & Purification, Global Discovery Chemistry, Janssen Research and Development, Janssen-Cilag, S.A., C/Jarama 75A, E-45007 Toledo, Spain
| | - Marta Serrano
- Chemical Capabilities, Analytical & Purification, Global Discovery Chemistry, Janssen Research and Development, Janssen-Cilag, S.A., C/Jarama 75A, E-45007 Toledo, Spain
| | - Alejandro Diéguez-Vázquez
- Chemical Capabilities, Analytical & Purification, Global Discovery Chemistry, Janssen Research and Development, Janssen-Cilag, S.A., C/Jarama 75A, E-45007 Toledo, Spain
| | - José Enrique Gómez
- Chemical Capabilities, Analytical & Purification, Global Discovery Chemistry, Janssen Research and Development, Janssen-Cilag, S.A., C/Jarama 75A, E-45007 Toledo, Spain
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5
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Pang Q, Li Y, Xie X, Tang J, Liu Q, Peng C, Li X, Han B. The emerging role of radical chemistry in the amination transformation of highly strained [1.1.1]propellane: Bicyclo[1.1.1]pentylamine as bioisosteres of anilines. Front Chem 2022; 10:997944. [PMID: 36339044 PMCID: PMC9634170 DOI: 10.3389/fchem.2022.997944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Accepted: 10/10/2022] [Indexed: 11/26/2022] Open
Abstract
Bicyclo[1.1.1]pentylamines (BPCAs), emerging as sp3-rich surrogates for aniline and its derivatives, demonstrate unique structural features and physicochemical profiles in medicinal and synthetic chemistry. In recent years, compared with conventional synthetic approaches, the rapid development of radical chemistry enables the assembly of valuable bicyclo[1.1.1]pentylamines scaffold directly through the amination transformation of highly strained [1.1.1]propellane. In this review, we concisely summarize the emerging role of radical chemistry in the construction of BCPAs motif, highlighting two different and powerful radical-involved strategies including C-centered and N-centered radical pathways under appropriate conditions. The future direction concerning BCPAs is also discussed at the end of this review, which aims to provide some inspiration for the research of this promising project.
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Affiliation(s)
| | | | | | | | | | | | - Xiang Li
- State Key Laboratory of Southwestern Chinese Medicine Resources, Hospital of Chengdu University of Traditional Chinese Medicine, School of Pharmacy and College of Medical Technology, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Bo Han
- State Key Laboratory of Southwestern Chinese Medicine Resources, Hospital of Chengdu University of Traditional Chinese Medicine, School of Pharmacy and College of Medical Technology, Chengdu University of Traditional Chinese Medicine, Chengdu, China
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6
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Du X, Xu D, Xu G, Yu C, Jiang X. Synthesis of Imidized Cyclobutene Derivatives by Strain Release of [1.1.1]Propellane. Org Lett 2022; 24:7323-7327. [PMID: 36190793 DOI: 10.1021/acs.orglett.2c02790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Herein, we report the metal-free synthesis of imidized methylene cyclobutane derivatives via a strain-release driven addition reaction of [1.1.1]propellane. Using this strategy, the methylene cyclobutyl cation intermediate generated by protonation of [1.1.1]propellane was found to be trapped by nitriles to form a nitrilium ion intermediate, which subsequently reacted with carboxylic acids to produce imidized methylene cyclobutene derivatives via a Mumm-type rearrangement.
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Affiliation(s)
- Xiaofan Du
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Di Xu
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Gongcheng Xu
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Chuanming Yu
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Xinpeng Jiang
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou 310014, P. R. China
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