1
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Yang H, Wang J, Jin C, Li X, Xu X. Au(I)-Catalyzed Regioselective Hydrofluorination of Propargylamines Using Aqueous HF. J Org Chem 2023; 88:12074-12078. [PMID: 37494279 DOI: 10.1021/acs.joc.3c00594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/28/2023]
Abstract
Gold-catalyzed regioselective hydrofluorination of alkynes using aqueous HF has been achieved by employing an amide directing group. For both aryl- and alkyl-substituted propargylamines, the fluorination occurred at the site distal to the amino group.
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Affiliation(s)
- Hui Yang
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P.R. China
| | - Jie Wang
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P.R. China
| | - Can Jin
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P.R. China
| | - Xiaoqing Li
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P.R. China
| | - Xiangsheng Xu
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P.R. China
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2
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3
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Sletten EM, Jaye JA. Simple Synthesis of Fluorinated Ene-Ynes via In Situ Generation of Allenes. SYNTHESIS-STUTTGART 2021. [DOI: 10.1055/s-0037-1610774] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AbstractFluorination of small molecules is a key route toward modulating reactivity and bioactivity. The 1,3 ene-yne functionality is an important synthon towards complex products, as well as a common functionality in biologically active molecules. Here, we present a new synthetic route towards fluorinated ene-ynes from simple starting materials. We employ gas chromatography-mass spectrometry analysis to probe the sequential eliminations necessary for this transformation and observe an allene intermediate. The ene-yne products are sufficiently fluorous to enable purification via fluorous extraction. This methodology will allow facile access to functional, fluorous ene-ynes.
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4
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Zhu B, Han H, Su WK, Yan B, Li Z, Yu C, Jiang X. Highly Stereoselective Intramolecular Carbofluorination of Internal α,β-Ynones Promoted by Selectfluor. Org Lett 2021; 23:4488-4492. [PMID: 34029477 DOI: 10.1021/acs.orglett.1c01441] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein, we report a metal-free intramolecular carbofluorination protocol for the synthesis of tetrasubstituted monofluoroalkenes from internal α,β-ynones and Selectfluor with both high stereoselectivity and broad functional group tolerance. The chelation between tetrafluoroborate anion and the oxygen present in the aldehyde group rendered the reaction highly stereoselective, with the tetrafluoroborate serving as the direct fluorine source. Therefore, with addition of sodium tetrafluoroborate, Selectfluor could be reused several times without sacrificing reactivity.
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Affiliation(s)
- Bingbin Zhu
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou 310014, P.R. China
| | - Hang Han
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou 310014, P.R. China
| | - Wei-Ke Su
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou 310014, P.R. China
| | - Boan Yan
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou 310014, P.R. China
| | - Zhi Li
- 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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5
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Li H, Yang Y, Han Z, Liu C, Zhang D. Computational mechanistic study on Pd-catalyzed stereoselective synthesis of Z-1,3- and E-1,4-enynes from ligand-controlled regiodivergent hydroalkynylations of allenamides. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2020.110765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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6
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Li C, Cao YX, Jin RX, Bian KJ, Qin ZY, Lan Q, Wang XS. Highly stereoselective nickel-catalyzed difluoroalkylation of aryl ketones to tetrasubstituted monofluoroalkenes and quaternary alkyl difluorides. Chem Sci 2019; 10:9285-9291. [PMID: 32055314 PMCID: PMC7003883 DOI: 10.1039/c9sc02806d] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Accepted: 08/17/2019] [Indexed: 12/19/2022] Open
Abstract
A nickel-catalyzed difluoroalkylation of α-C-H bonds of aryl ketones to furnish highly stereo-defined tetrasubstituted monofluoroalkenes or quaternary alkyl difluorides from secondary or tertiary ketones, respectively, has been established. Mechanistic investigations indicated that these C-H fluoroalkylations proceed via a Ni(i)/Ni(iii) catalytic cycle. An obvious fluorine effect was observed in the reaction, and this reaction has demonstrated high stereoselectivity, mild conditions, and broad substrate scopes, thus enabling the late-stage fluoroalkylation of bioactive molecules. This method offers a solution for expedient construction of monofluoroalkenes from readily available materials, and provides an efficient approach for the synthesis of bioactive fluorinated compounds for the discovery of lead compounds in medicinal chemistry.
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Affiliation(s)
- Chao Li
- Hefei National Laboratory for Physical Sciences at the Microscale , Department of Chemistry , Center for Excellence in Molecular Synthesis of CAS , University of Science and Technology of China , Hefei , Anhui 230026 , China .
| | - Yi-Xuan Cao
- Hefei National Laboratory for Physical Sciences at the Microscale , Department of Chemistry , Center for Excellence in Molecular Synthesis of CAS , University of Science and Technology of China , Hefei , Anhui 230026 , China .
| | - Ruo-Xing Jin
- Hefei National Laboratory for Physical Sciences at the Microscale , Department of Chemistry , Center for Excellence in Molecular Synthesis of CAS , University of Science and Technology of China , Hefei , Anhui 230026 , China .
| | - Kang-Jie Bian
- Hefei National Laboratory for Physical Sciences at the Microscale , Department of Chemistry , Center for Excellence in Molecular Synthesis of CAS , University of Science and Technology of China , Hefei , Anhui 230026 , China .
| | - Zi-Yang Qin
- Hefei National Laboratory for Physical Sciences at the Microscale , Department of Chemistry , Center for Excellence in Molecular Synthesis of CAS , University of Science and Technology of China , Hefei , Anhui 230026 , China .
| | - Quan Lan
- Hefei National Laboratory for Physical Sciences at the Microscale , Department of Chemistry , Center for Excellence in Molecular Synthesis of CAS , University of Science and Technology of China , Hefei , Anhui 230026 , China .
| | - Xi-Sheng Wang
- Hefei National Laboratory for Physical Sciences at the Microscale , Department of Chemistry , Center for Excellence in Molecular Synthesis of CAS , University of Science and Technology of China , Hefei , Anhui 230026 , China .
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7
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Zhang YA, Yaw N, Snyder SA. General Synthetic Approach for the Laurencia Family of Natural Products Empowered by a Potentially Biomimetic Ring Expansion. J Am Chem Soc 2019; 141:7776-7788. [DOI: 10.1021/jacs.9b01088] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Yu-An Zhang
- Department of Chemistry, University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
| | - Natalie Yaw
- Department of Chemistry, University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
| | - Scott A. Snyder
- Department of Chemistry, University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
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8
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Peng F, Zhao Q, Huang W, Liu SJ, Zhong YJ, Mao Q, Zhang N, He G, Han B. Amine-catalyzed and functional group-controlled chemo- and regioselective synthesis of multi-functionalized CF3-benzene via a metal-free process. GREEN CHEMISTRY 2019. [DOI: 10.1039/c9gc02694k] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A novel strategy for the synthesis of CF3-containing multi-substituted benzenes with high chemo- and regioselectivities under metal-free and air-tolerant conditions was established.
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Affiliation(s)
- Fu Peng
- State Key Laboratory of Biotherapy
- West China Hospital
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
| | - Qian Zhao
- State Key Laboratory of Southwestern Chinese Medicine Resources
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- China
| | - Wei Huang
- State Key Laboratory of Southwestern Chinese Medicine Resources
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- China
| | - Shuai-Jiang Liu
- State Key Laboratory of Southwestern Chinese Medicine Resources
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- China
| | - Ya-Jun Zhong
- State Key Laboratory of Southwestern Chinese Medicine Resources
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- China
| | - Qing Mao
- State Key Laboratory of Southwestern Chinese Medicine Resources
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- China
| | - Nan Zhang
- State Key Laboratory of Biotherapy
- West China Hospital
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
| | - Gu He
- State Key Laboratory of Biotherapy
- West China Hospital
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
| | - Bo Han
- State Key Laboratory of Southwestern Chinese Medicine Resources
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- China
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9
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Wei W, Khangarot RK, Stahl L, Veresmortean C, Pradhan P, Yang L, Zajc B. Generating Stereodiversity: Diastereoselective Fluorination and Highly Diastereoselective Epimerization of α-Amino Acid Building Blocks. Org Lett 2018; 20:3574-3578. [PMID: 29856640 DOI: 10.1021/acs.orglett.8b01358] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Diastereoselective fluorination of N-Boc ( R)- and ( S)-2,2-dimethyl-4-((arylsulfonyl)methyl)oxazolidines and a previously unknown diastereoselective epimerization at the fluorine-bearing carbon atom α to the sulfone was realized. Diastereoselectivities of both reactions were excellent for benzothiazolyl sulfones, allowing access to two enantiomerically pure diastereomers from one chiral precursor. To demonstrate synthetic utility, the benzothiazolyl sulfones were converted to diastereomerically pure ( S, S)- and ( R, S)-benzyl sulfones via sulfinate salts and to amino acids. To understand the diastereoselectivities, DFT analysis was performed.
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Affiliation(s)
- Wei Wei
- Department of Chemistry and Biochemistry , The City College of New York , 160 Convent Avenue , New York , New York 10031 , United States.,The Ph.D. Program in Chemistry, The Graduate Center , City University of New York , New York , New York 10016 , United States
| | - Rama Kanwar Khangarot
- Department of Chemistry and Biochemistry , The City College of New York , 160 Convent Avenue , New York , New York 10031 , United States
| | - Lothar Stahl
- Department of Chemistry , University of North Dakota , Abbott Hall Room 425, 151 Cornell Street Stop 9024 , Grand Forks , North Dakota 58202-9024 , United States
| | - Cristina Veresmortean
- Department of Chemistry and Biochemistry , The City College of New York , 160 Convent Avenue , New York , New York 10031 , United States
| | - Padmanava Pradhan
- Department of Chemistry and Biochemistry , The City College of New York , 160 Convent Avenue , New York , New York 10031 , United States
| | - Lijia Yang
- Department of Chemistry and Biochemistry , The City College of New York , 160 Convent Avenue , New York , New York 10031 , United States
| | - Barbara Zajc
- Department of Chemistry and Biochemistry , The City College of New York , 160 Convent Avenue , New York , New York 10031 , United States.,The Ph.D. Program in Chemistry, The Graduate Center , City University of New York , New York , New York 10016 , United States
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10
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Lim C, Ahn J, Sim J, Yun H, Hur J, An H, Jang J, Lee S, Suh YG. Total synthesis of (+)-brasilenyne via concise construction of an oxonane framework containing a 1,3-cis,cis-diene. Chem Commun (Camb) 2018; 54:467-470. [DOI: 10.1039/c7cc08329g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The enantioselective total synthesis of (+)-brasilenyne, which has a unique oxonane framework containing a 1,3-cis,cis-diene, has been accomplished.
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Affiliation(s)
- Changjin Lim
- College of Pharmacy
- CHA University
- Pocheon-si
- Republic of Korea
- College of Pharmacy
| | - Jungmin Ahn
- College of Pharmacy
- Seoul National University
- Gwanak-gu
- Republic of Korea
| | - Jaehoon Sim
- College of Pharmacy
- CHA University
- Pocheon-si
- Republic of Korea
- College of Pharmacy
| | - Hwayoung Yun
- College of Pharmacy
- Pusan National University
- Busan 46241
- Republic of Korea
| | - Joonseong Hur
- College of Pharmacy
- Seoul National University
- Gwanak-gu
- Republic of Korea
| | - Hongchan An
- College of Pharmacy
- Seoul National University
- Gwanak-gu
- Republic of Korea
| | - Jaebong Jang
- College of Pharmacy
- Seoul National University
- Gwanak-gu
- Republic of Korea
| | - Seungbeom Lee
- College of Pharmacy
- Seoul National University
- Gwanak-gu
- Republic of Korea
| | - Young-Ger Suh
- College of Pharmacy
- CHA University
- Pocheon-si
- Republic of Korea
- College of Pharmacy
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11
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Zhang J, Liu L, Duan J, Gu L, Chen B, Sun T, Gong Y. Stereoselective One-Pot Sequential Dehydrochlorination/trans
-Hydrofluorination Reaction of β-Chloro-α,β-unsaturated Aldehydes or Ketones: Facile Access to (Z
)-β-Fluoro-β-arylenals/β-Fluoro-β-arylenones. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700981] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Jingli Zhang
- School of Chemistry, Chemical Engineering and Life Science; Wuhan University of Technology; Wuhan 430070 People's Republic of China
- School of Chemistry and Chemical Engineering; Huazhong University of Science and Technology; 1037 Luoyu Road Wuhan 430074 People's Republic of China
| | - Liran Liu
- School of Chemistry, Chemical Engineering and Life Science; Wuhan University of Technology; Wuhan 430070 People's Republic of China
| | - Junxin Duan
- School of Materials Science and Engineering; Wuhan University of Technology; Wuhan 430070 People's Republic of China
| | - Lianghu Gu
- School of Chemistry and Chemical Engineering; Huazhong University of Science and Technology; 1037 Luoyu Road Wuhan 430074 People's Republic of China
| | - Bifeng Chen
- School of Chemistry, Chemical Engineering and Life Science; Wuhan University of Technology; Wuhan 430070 People's Republic of China
| | - Taolei Sun
- School of Chemistry, Chemical Engineering and Life Science; Wuhan University of Technology; Wuhan 430070 People's Republic of China
| | - Yuefa Gong
- School of Chemistry and Chemical Engineering; Huazhong University of Science and Technology; 1037 Luoyu Road Wuhan 430074 People's Republic of China
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12
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Ahn J, Lim C, Yun H, Kim HS, Kwon S, Lee J, Lee S, An H, Park HG, Suh YG. Asymmetric Total Synthesis of (+)-Intricenyne via an Endocyclization Route to Oxocane Skeleton. Org Lett 2017; 19:6642-6645. [DOI: 10.1021/acs.orglett.7b03370] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jungmin Ahn
- Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Changjin Lim
- Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
- College
of Pharmacy, CHA University, 120 Haeryong-ro, Pocheon, Gyeonggi-do 11160, Republic of Korea
| | - Hwayoung Yun
- College
of Pharmacy, Pusan National University, Busan 46241, Republic of Korea
| | - Hyun Su Kim
- Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Soonbum Kwon
- Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Jeeyeon Lee
- Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Seungbeom Lee
- Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Hongchan An
- Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Hyeong-geun Park
- Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Young-Ger Suh
- Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
- College
of Pharmacy, CHA University, 120 Haeryong-ro, Pocheon, Gyeonggi-do 11160, Republic of Korea
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13
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5-Alkylresorcinol Derivatives from the Bryozoan Schizomavella mamillata: Isolation, Synthesis, and Antioxidant Activity. Mar Drugs 2017; 15:md15110344. [PMID: 29099074 PMCID: PMC5706034 DOI: 10.3390/md15110344] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Revised: 10/24/2017] [Accepted: 10/30/2017] [Indexed: 12/18/2022] Open
Abstract
The chemical study of the bryozoan Schizomavella mamillata has led to the isolation of six new 5-alkylresorcinol derivatives, schizols A–F (1–6), whose structures were established by spectrocospic means. Schizol A (1) exhibits a (E)-6-phenylnon-5-enyl moiety linked to the C-5 of a resorcinol ring, while in schizol B (2) the substituent at C-5 contains an unusual 1,2-dihydrocyclobutabenzene moiety. Schizols C (3) and D (4) have been characterized as the 1-sulfate derivatives of 1 and 2, respectively, and schizols E (5) and F (6) are the corresponding 1,3-disulfates. Schizol A (1) has been synthetized from 3,5-dimethoxybenzaldehyde through a sequence involving a Wittig reaction for the construction of the C-1′,C-2′ bond and a Julia–Kocienski olefination for the synthesis of the C-5′,C-6′ double bond. In the ABTS (2,2′-azinobis(3-ethylbenzothiazoline-6-sulphonic acid)) antioxidant assay, the natural compounds schizol A (1) and schizol B (2) showed higher radical scavenging activity than the Trolox standard.
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14
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Banerjee S, Sinha S, Pradhan P, Caruso A, Liebowitz D, Parrish D, Rossi M, Zajc B. Regiospecifically Fluorinated Polycyclic Aromatic Hydrocarbons via Julia-Kocienski Olefination and Oxidative Photocyclization. Effect of Fluorine Atom Substitution on Molecular Shape. J Org Chem 2016; 81:3983-93. [PMID: 27009471 PMCID: PMC4874880 DOI: 10.1021/acs.joc.5b02580] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A modular synthesis of regiospecifically fluorinated polycyclic aromatic hydrocarbons (PAHs) is described. 1,2-Diarylfluoroalkenes, synthesized via Julia-Kocienski olefination (70-99% yields), were converted to isomeric 5- and 6-fluorobenzo[c]phenanthrene, 5-and 6-fluorochrysene, and 9- and 10-benzo[g]chrysene (66-83% yields) by oxidative photocyclization. Photocyclization to 6-fluorochrysene proceeded more slowly than conversion of 1-styrylnaphthalene to chrysene. Higher fluoroalkene dilution led to a more rapid cyclization. Therefore, photocyclizations were performed at higher dilutions. To evaluate the effect of fluorine atom on molecular shapes, X-ray data for 5- and 6-fluorobenzo[c]phenanthrene, 6-fluorochrysene, 9- and 10-fluorobenzo[g]chrysene, and unfluorinated chrysene as well as benzo[g]chrysene were obtained and compared. The fluorine atom caused a small deviation from planarity in the chrysene series and decreased nonplanarity in the benzo[c]phenanthrene derivatives, but its influence was most pronounced in the benzo[g]chrysene series. A remarkable flattening of the molecule was observed in 9-fluorobenzo[g]chrysene, where the short 2.055 Å interatomic distance between bay-region F-9 and H-8, downfield shift of H-8, and a 26.1 Hz coupling between F-9 and C-8 indicate a possible F-9···H-8 hydrogen bond. In addition, in 9-fluorobenzo[g]chrysene, the stacking distance is short at 3.365 Å and there is an additional interaction between the C-11-H and C-10a of a nearby molecule that is almost perpendicular.
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Affiliation(s)
- Shaibal Banerjee
- Department of Chemistry, The City College of New York, 160
Convent Avenue, New York, New York 10031, United States
| | - Saikat Sinha
- Department of Chemistry, The City College of New York, 160
Convent Avenue, New York, New York 10031, United States
| | - Padmanava Pradhan
- Department of Chemistry, The City College of New York, 160
Convent Avenue, New York, New York 10031, United States
| | - Alessio Caruso
- Department of Chemistry, Vassar College, Poughkeepsie, New
York 12604, United States
| | - Daniel Liebowitz
- Department of Chemistry, Vassar College, Poughkeepsie, New
York 12604, United States
| | - Damon Parrish
- Naval Research Laboratory, Code 6030, 4555 Overlook Avenue,
Washington D.C. 20375, United States
| | - Miriam Rossi
- Department of Chemistry, Vassar College, Poughkeepsie, New
York 12604, United States
| | - Barbara Zajc
- Department of Chemistry, The City College of New York, 160
Convent Avenue, New York, New York 10031, United States
- The Ph.D. Program in Chemistry, The Graduate Center of The
City University of New York, New York, New York 10016, United States
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15
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Zhang Z, Zhou Q, Yu W, Li T, Wu G, Zhang Y, Wang J. Cu(I)-Catalyzed Cross-Coupling of Terminal Alkynes with Trifluoromethyl Ketone N-Tosylhydrazones: Access to 1,1-Difluoro-1,3-enynes. Org Lett 2015; 17:2474-7. [DOI: 10.1021/acs.orglett.5b00980] [Citation(s) in RCA: 106] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zhikun Zhang
- Beijing
National Laboratory of Molecular Sciences (BNLMS) and Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, China
| | - Qi Zhou
- Beijing
National Laboratory of Molecular Sciences (BNLMS) and Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, China
| | - Weizhi Yu
- Beijing
National Laboratory of Molecular Sciences (BNLMS) and Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, China
| | - Tianjiao Li
- Beijing
National Laboratory of Molecular Sciences (BNLMS) and Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, China
| | - Guojiao Wu
- Beijing
National Laboratory of Molecular Sciences (BNLMS) and Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, China
| | - Yan Zhang
- Beijing
National Laboratory of Molecular Sciences (BNLMS) and Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, China
| | - Jianbo Wang
- Beijing
National Laboratory of Molecular Sciences (BNLMS) and Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, China
- State
Key Laboratory of Organometallic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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16
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Kumar R, Singh G, Todaro LJ, Yang L, Zajc B. E- or Z-Selective synthesis of 4-fluorovinyl-1,2,3-triazoles with fluorinated second-generation Julia-Kocienski reagents. Org Biomol Chem 2015; 13:1536-49. [PMID: 25491086 PMCID: PMC4859785 DOI: 10.1039/c4ob02179g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A highly modular approach to N-substituted 4-(1-fluorovinyl)triazoles is described. In situ desilylation and Cu-catalyzed ligation reaction of TMS-protected α-fluoropropargyl benzothiazole sulfone with aryl, alkyl, and metallocenyl azides furnished second-generation Julia-Kocienski reagents in good to excellent yields. Condensation reactions of these reagents with aldehydes can be tuned to yield E or Z-alkenes selectively. Under mild conditions with DBU as the base, reactions of aldehydes furnished E-alkenes as the major isomer. On the other hand, in condensation reactions with LHMDS as the base and in appropriate solvents, both aldehydes and ketones reacted to yield fluoroalkenes with Z-selectivity. Stereochemical assignment of E/Z olefins obtained in the reaction of a ketone with two Julia reagents was performed via X-ray crystallographic analysis and comparisons of NMR data. The method allows efficient and ready diversification of the N1-substituent and substituents at the double bond.
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Affiliation(s)
- Rakesh Kumar
- Department of Chemistry, The City College and The City University of New York, 160 Convent Avenue, New York, NY 10031
| | - Govindra Singh
- Department of Chemistry, The City College and The City University of New York, 160 Convent Avenue, New York, NY 10031
| | - Louis J. Todaro
- The CUNY X-Ray Facility, Hunter College and The City University of New York, 695 Park Avenue, New York, NY 10065
| | - Lijia Yang
- Department of Chemistry, The City College and The City University of New York, 160 Convent Avenue, New York, NY 10031
| | - Barbara Zajc
- Department of Chemistry, The City College and The City University of New York, 160 Convent Avenue, New York, NY 10031
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Stereoselective synthesis of β-fluoroenyne by the reaction of gem -difluoroalkenes with terminal alkynes. J Fluor Chem 2014. [DOI: 10.1016/j.jfluchem.2014.10.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Ni C, Hu M, Hu J. Good partnership between sulfur and fluorine: sulfur-based fluorination and fluoroalkylation reagents for organic synthesis. Chem Rev 2014; 115:765-825. [PMID: 25144886 DOI: 10.1021/cr5002386] [Citation(s) in RCA: 924] [Impact Index Per Article: 92.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Chuanfa Ni
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences , 345 Ling-Ling Road, Shanghai City, Shanghai 200032, China
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Synthesis of regiospecifically fluorinated conjugated dienamides. Molecules 2014; 19:4418-32. [PMID: 24727415 PMCID: PMC4440806 DOI: 10.3390/molecules19044418] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2014] [Revised: 03/22/2014] [Accepted: 03/31/2014] [Indexed: 11/17/2022] Open
Abstract
Modular synthesis of regiospecifically fluorinated 2,4-diene Weinreb amides, with defined stereochemistry at both double bonds, was achieved via two sequential Julia-Kocienski olefinations. In the first step, a Z-α-fluorovinyl Weinreb amide unit with a benzothiazolylsulfanyl substituent at the allylic position was assembled. This was achieved via condensation of two primary building blocks, namely 2-(benzo[d]thiazol-2-ylsulfonyl)-2-fluoro-N-methoxy-N-methylacetamide (a Julia-Kocienski olefination reagent) and 2-(benzo[d]thiazol-2-ylthio)acetaldehyde (a bifunctional building block). This condensation was highly Z-selective and proceeded in a good 76% yield. Oxidation of benzothiazolylsulfanyl moiety furnished a second-generation Julia-Kocienski olefination reagent, which was used for the introduction of the second olefinic linkage via DBU-mediated condensations with aldehydes, to give (2Z,4E/Z)-dienamides in 50%–74% yield. Although olefinations were 4Z-selective, (2Z,4E/Z)-2-fluoro-2,4-dienamides could be readily isomerized to the corresponding 5-substituted (2Z,4E)-2-fluoro-N-methoxy-N-methylpenta-2,4-dienamides in the presence of catalytic iodine.
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Hafner A, Fischer TS, Bräse S. Synthesis of CF3-Substituted Olefins by Julia-Kocienski Olefination Using 2-[(2,2,2-Trifluoroethyl)sulfonyl]benzo[d]thiazole as Trifluoromethylation Agent. European J Org Chem 2013. [DOI: 10.1002/ejoc.201301070] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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