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Peng C, Wang C, Wu C, Xing J, Xue F, Dou X. Chemodivergent and Enantioselective Synthesis of Spirobi[dihydrophenalene] Structures. Org Lett 2025; 27:869-873. [PMID: 39792267 DOI: 10.1021/acs.orglett.4c04612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2025]
Abstract
The development and enantioselective synthesis of two types of C2-symmetric spirobi[dihydrophenalene] structures is reported. The reaction proceeds via rhodium-catalyzed 2-fold asymmetric conjugate arylation of dienones followed by BF3·OEt2-promoted spirocyclization to give the enantiopure spiro products. Additive-dependent chemodivergent synthesis of 3,3'-diarylated 2,2',3,3'-tetrahydro-1,1'-spirobi[phenalene]-9,9'-diols (3,3'-Ar2-SPHENOLs) and the corresponding spiro diary ethers from the same intermediate is achieved. The structural properties of 3,3'-Ph2-SPHENOL are analyzed, and its application in asymmetric catalysis has been preliminarily demonstrated.
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Affiliation(s)
- Chuanyong Peng
- Department of Chemistry, School of Science, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Chenhong Wang
- Department of Chemistry, School of Science, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Changhui Wu
- Department of Chemistry, School of Science, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Junhao Xing
- Department of Chemistry, School of Science, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Fei Xue
- Institute of Material Physics and Chemistry, College of Science, Nanjing Forestry University, Nanjing 210037, People's Republic of China
| | - Xiaowei Dou
- Department of Chemistry, School of Science, China Pharmaceutical University, Nanjing 211198, People's Republic of China
- State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210023, People's Republic of China
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Zheng Z, Duan ZC, Hu XP. Tropos Diphenylmethane-Based Phosphine-Phosphoramidite Ligands: Design, Synthesis, and Application in Catalytic Asymmetric Hydrogenation. Org Lett 2025; 27:651-656. [PMID: 39781661 DOI: 10.1021/acs.orglett.4c04503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2025]
Abstract
A series of chiral hybrid diphosphorus ligands incorporating a conformationally flexible tropos diphenylmethane-based phosphoramidite unit have been developed and evaluated in the Rh-catalyzed asymmetric hydrogenation of 2-(1-arylvinyl)anilides and α-enamides, leading to up to >99% yield and 99% enantiomeric excess. Preliminary results from comparative studies showcased the extraordinary catalytic performance of these chiral tropos phosphine-phosphoramidite ligands, with a competency essentially superior to those of well-established ligands with a regular rigid backbone.
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Affiliation(s)
- Zhong Zheng
- School of Chemical and Enviromental Engineering, Hubei Minzu University, Enshi 445000, China
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China
| | - Zheng-Chao Duan
- School of Chemical and Enviromental Engineering, Hubei Minzu University, Enshi 445000, China
| | - Xiang-Ping Hu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China
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Zhang Q, Zhang J, Qian H, Ma S. Aerobic Oxidation of PMB Ethers to Carboxylic Acids. Chemistry 2024; 30:e202401815. [PMID: 38925594 DOI: 10.1002/chem.202401815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2024] [Revised: 06/20/2024] [Accepted: 06/24/2024] [Indexed: 06/28/2024]
Abstract
The first aerobic protocol of direct transformation of p-methoxybenzyl (PMB) ethers to carboxylic acids efficiently with Fe(NO3)3 ⋅ 9H2O and TEMPO as catalysts at room temperature has been developed. The reaction accommodates C-Br bond, terminal/non-terminal C-C triple bond, amide, cyano, nitro, ester, and trifluoromethyl groups. Even highly selective oxidative deprotection of different benzylic PMB ethers has been realized. The reaction has been successfully applied to the total synthesis of natural product, (R)-6-hydroxy-7,9-octadecadiynoic acid, demonstrating the practicality of the method. Based on experimental studies, a possible mechanism involving oxygen-stabilized benzylic cation has been proposed.
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Affiliation(s)
- Qian Zhang
- Research Center for Molecular Recognition and Synthesis, Department of Chemistry, Fudan University, 220 Handan Lu, Shanghai, 200433, China
| | - Jiabin Zhang
- Laboratory of Molecular Recognition and Synthesis, Department of Chemistry, Zhejiang University, Hangzhou, 310027, Zhejiang Province, China
| | - Hui Qian
- Research Center for Molecular Recognition and Synthesis, Department of Chemistry, Fudan University, 220 Handan Lu, Shanghai, 200433, China
| | - Shengming Ma
- Research Center for Molecular Recognition and Synthesis, Department of Chemistry, Fudan University, 220 Handan Lu, Shanghai, 200433, China
- Laboratory of Molecular Recognition and Synthesis, Department of Chemistry, Zhejiang University, Hangzhou, 310027, Zhejiang Province, China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai, 200032, China
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Nan LF, Chen XS, Chen H, Hu XH, Wang XH, Hu XP. Development of spirocyclic phosphoramidite-based hybrid diphosphorus ligands for enantioselective iridium-catalyzed hydrogenation of imines. Org Biomol Chem 2022; 20:8420-8424. [DOI: 10.1039/d2ob01801b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Novel spirocyclic phosphine–phosphoramidite ligands for highly efficient and enantioselective Ir-catalyzed hydrogenation of various imines.
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Affiliation(s)
- Long-Fei Nan
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China
| | - Xiu-Shuai Chen
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China
| | - Hao Chen
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China
| | - Xin-Hu Hu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China
| | - Xin-Hong Wang
- School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China
| | - Xiang-Ping Hu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China
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