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Sun G, Wang Z, Deng Z, Luo Z, Zhang J. Development of novel C2-symmetrical [5]oxahelicenoid diols. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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2
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Affiliation(s)
- Jiarong Shi
- School of Chemistry and Chemical Engineering, Chongqing University, 174 Shazheng Street, Chongqing, P. R. China, 400030
| | - Lianggui Li
- School of Chemistry and Chemical Engineering, Chongqing University, 174 Shazheng Street, Chongqing, P. R. China, 400030
| | - Yang Li
- School of Chemistry and Chemical Engineering, Chongqing University, 174 Shazheng Street, Chongqing, P. R. China, 400030
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3
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Kamble SB, Maliekal PJ, Dharpure PD, Badani PM, Karnik AV. Synthesis of Concave and Vaulted 2 H-Pyran-Fused BINOLs and Corresponding [5] and [7]-Oxa-helicenoids: Regioselective Cascade-Concerted Route and DFT Studies. J Org Chem 2020; 85:7739-7747. [PMID: 32432472 DOI: 10.1021/acs.joc.0c00363] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Synthesis of concave and vaulted 2H-pyran-fused BINOLs has been achieved. A regioselective, path-breaking concerted cascade route allows the placement of six-membered heteroaromatic rings at the sterically crowded 7,8 and 7',8' positions of BINOL. DFT studies with relative energetics that support the kinetically controlled reaction pathway are preferred, matching the experimental results. The new BINOLs exhibit smaller dihedral angle than BINOL on the diol part; this structural feature can be an assisting factor for better ligation with metals in the metal-catalyzed reactions. Corresponding C2 symmetric [5] and [7]-oxa-helicenoids have an overlapping, sterically crowded geometry.
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Affiliation(s)
- Siddharth B Kamble
- Department of Chemistry, University of Mumbai, Vidyanagari, Santacruz(East), Mumbai 400098, India
| | - Parimal J Maliekal
- Department of Chemistry, University of Mumbai, Vidyanagari, Santacruz(East), Mumbai 400098, India
| | - Pankaj D Dharpure
- Department of Chemistry, Indian Institute of Science Education and Research (IISER)-Pune, Dr. Homi Bhabha Road, Pashan, 411008 Pune, Maharashtra, India
| | - Purav M Badani
- Department of Chemistry, University of Mumbai, Vidyanagari, Santacruz(East), Mumbai 400098, India
| | - Anil V Karnik
- Department of Chemistry, University of Mumbai, Vidyanagari, Santacruz(East), Mumbai 400098, India
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4
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Zhan XY, Zhang H, Dong Y, Yang J, He S, Shi ZC, Tang L, Wang JY. Chemoselective Hydrosilylation of the α,β-Site Double Bond in α,β- and α,β,γ,δ-Unsaturated Ketones Catalyzed by Macrosteric Borane Promoted by Hexafluoro-2-propanol. J Org Chem 2020; 85:6578-6592. [PMID: 32316729 DOI: 10.1021/acs.joc.0c00568] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The B(C6F5)3-catalyzed chemoselective hydrosilylation of α,β- and α,β,γ,δ-unsaturated ketones into the corresponding non-symmetric ketones in mild reaction conditions is developed. Nearly 55 substrates including those bearing reducible functional groups such as alkynyl, alkenyl, cyano, and aromatic heterocycles are chemoselectively hydrosilylated in good to excellent yields. Isotope-labeling studies revealed that hexafluoro-2-propanol also served as a hydrogen source in the process.
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Affiliation(s)
- Xiao-Yu Zhan
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, PR China.,University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Hua Zhang
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, PR China.,University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Yu Dong
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, PR China.,University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Jian Yang
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, PR China.,University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Shuai He
- Southwest Minzu University, Chengdu 610041, P. R. China
| | - Zhi-Chuan Shi
- Southwest Minzu University, Chengdu 610041, P. R. China
| | - Lei Tang
- Laboratory of Anaesthesia & Critical Care Medicine, Translational Neuroscience Center and Department of Anaesthesiology, West China Hospital, Sichuan University, Chengdu 610041, P. R. China
| | - Ji-Yu Wang
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, PR China
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5
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Khose VN, Hasan M, Khot SC, Mobin SM, Borovkov V, Karnik AV. Directional Approach to Enantiomerically Enriched Functionalized [7]Oxa-helicenoids and Groove-Based Selective Cyanide Sensing. J Org Chem 2020; 85:1847-1860. [PMID: 31858799 DOI: 10.1021/acs.joc.9b02100] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Several regioselective functionalized mono- and disubstituted [7]oxa-helicenoids have been synthesized in the enantiomerically enriched (90-99% ee) form. These functionalized helicenoids exhibited pronounced spectral and chiroptical properties suitable for sensing applications. In particular, corresponding helicenoid's mono and dialdehydes have been effectively used as chemodosimeters for selective detection of cyanide anions over other anions, while simple aromatic aldehydes do not function as cyanide sensors. The groove available in the helical host plays a crucial role in the sensing. The enantiomerically enriched nature of the sensors allows the use of electronic circular dichroism as an uncommon detection tool for cyanide anions, along with conventional fluorescence and NMR methods.
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Affiliation(s)
- Vaibhav N Khose
- Department of Chemistry , University of Mumbai , Vidyanagari, Santacruz (East) , Mumbai 400098 , India
| | - Mohammed Hasan
- Department of Chemistry , University of Mumbai , Vidyanagari, Santacruz (East) , Mumbai 400098 , India.,College of Chemistry and Materials Science , South Central University for Nationalities , 182# Minzu RD , Hongshan District, Wuhan , Hubei province 430074 , China
| | - Sushil C Khot
- Department of Chemistry , University of Mumbai , Vidyanagari, Santacruz (East) , Mumbai 400098 , India
| | - Shaikh M Mobin
- Department of Chemistry , Indian Institute of Technology, Indore , Simrol, Khandwa Road , Indore 453552 , India
| | - Victor Borovkov
- College of Chemistry and Materials Science , South Central University for Nationalities , 182# Minzu RD , Hongshan District, Wuhan , Hubei province 430074 , China
| | - Anil V Karnik
- Department of Chemistry , University of Mumbai , Vidyanagari, Santacruz (East) , Mumbai 400098 , India
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6
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Hinkle RJ, Speer DJ, Carnell BB, Kanter BL, Pike RD. Mild, Modular, and Convergent Synthesis of Helical Naphtho[2,1- c]chromenes via a Multistep Cyclization/Aromatization Cascade Sequence. J Org Chem 2019; 84:15633-15641. [PMID: 31684728 DOI: 10.1021/acs.joc.9b02058] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Tetracyclic 6H-naphtho[2,1-c]chromenes are expeditiously synthesized through a BF3·OEt2-mediated, three-step cascade reaction, creating new central pyran and aromatic rings. The cascade involves the addition of phenol-derived alkynyl substrates to BF3-activated aldehydes followed by alkyne-Prins cyclization, Friedel-Crafts reaction, and final elimination. Aliphatic and electron-deficient aromatic aldehydes afford the products in 50-74% isolated yields, but benzaldehyde and tolualdehyde resulted in lower yields. X-ray analysis of a p-bromophenyl derivative (5aA) shows the two aromatic moieties are twisted by 28° to create a helical backbone.
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Affiliation(s)
- Robert J Hinkle
- Department of Chemistry , William & Mary , P.O. Box 8795, Williamsburg , Virginia 23187-8795 , United States
| | - Daniel J Speer
- Department of Chemistry , William & Mary , P.O. Box 8795, Williamsburg , Virginia 23187-8795 , United States
| | - Brendon B Carnell
- Department of Chemistry , William & Mary , P.O. Box 8795, Williamsburg , Virginia 23187-8795 , United States
| | - Bethany L Kanter
- Department of Chemistry , William & Mary , P.O. Box 8795, Williamsburg , Virginia 23187-8795 , United States
| | - Robert D Pike
- Department of Chemistry , William & Mary , P.O. Box 8795, Williamsburg , Virginia 23187-8795 , United States
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