1
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Makino K, Fukuda R, Sueki S, Anada M. Total Synthesis of Alanense A through an Intramolecular Friedel-Crafts Alkylation. J Org Chem 2024; 89:2050-2054. [PMID: 38241043 DOI: 10.1021/acs.joc.3c02481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2024]
Abstract
The first total synthesis of cadinane sesquiterpenoid alanense A, in which an intramolecular dehydrative Friedel-Crafts alkylation of 2,5-diaryl-2-pentanol is incorporated as a key step, has been achieved. The combinatorial use of p-TsOH·H2O as a catalyst and 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) as a solvent provides 1,1-disubstituted tetrahydronaphthalene in 97% yield. It was also found that the combination of p-TsOH and HFIP is effective for the removal of phenolic MOM ether.
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Affiliation(s)
- Kosho Makino
- Faculty of Pharmacy, Musashino University, Nishitokyo, Tokyo 202-8585, Japan
- Institute of Pharmaceutical Sciences, Musashino University, 1-1-20 Shinmachi, Nishitokyo, Tokyo 202-8585, Japan
| | - Rio Fukuda
- Faculty of Pharmacy, Musashino University, Nishitokyo, Tokyo 202-8585, Japan
| | - Shunsuke Sueki
- Faculty of Pharmacy, Musashino University, Nishitokyo, Tokyo 202-8585, Japan
- Institute of Pharmaceutical Sciences, Musashino University, 1-1-20 Shinmachi, Nishitokyo, Tokyo 202-8585, Japan
| | - Masahiro Anada
- Faculty of Pharmacy, Musashino University, Nishitokyo, Tokyo 202-8585, Japan
- Institute of Pharmaceutical Sciences, Musashino University, 1-1-20 Shinmachi, Nishitokyo, Tokyo 202-8585, Japan
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2
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Motiwala HF, Armaly AM, Cacioppo JG, Coombs TC, Koehn KRK, Norwood VM, Aubé J. HFIP in Organic Synthesis. Chem Rev 2022; 122:12544-12747. [PMID: 35848353 DOI: 10.1021/acs.chemrev.1c00749] [Citation(s) in RCA: 107] [Impact Index Per Article: 53.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
1,1,1,3,3,3-Hexafluoroisopropanol (HFIP) is a polar, strongly hydrogen bond-donating solvent that has found numerous uses in organic synthesis due to its ability to stabilize ionic species, transfer protons, and engage in a range of other intermolecular interactions. The use of this solvent has exponentially increased in the past decade and has become a solvent of choice in some areas, such as C-H functionalization chemistry. In this review, following a brief history of HFIP in organic synthesis and an overview of its physical properties, literature examples of organic reactions using HFIP as a solvent or an additive are presented, emphasizing the effect of solvent of each reaction.
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Affiliation(s)
- Hashim F Motiwala
- Divison of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599 United States
| | - Ahlam M Armaly
- Divison of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599 United States
| | - Jackson G Cacioppo
- Divison of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599 United States
| | - Thomas C Coombs
- Department of Chemistry, University of North Carolina Wilmington, Wilmington, North Carolina 28403 United States
| | - Kimberly R K Koehn
- Divison of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599 United States
| | - Verrill M Norwood
- Divison of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599 United States
| | - Jeffrey Aubé
- Divison of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599 United States
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3
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Yan Y, Li M, Liu M, Huang M, Cao L, Li W, Zhang X. Sc(OTf)
3
‐Catalyzed Dearomative [3+2] Annulation of 5‐Aminoisoxazoles with Quinone Imine Ketals or Quinone Monoacetals. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yingkun Yan
- Asymmetric Synthesis and Chiraltechnology Key Laboratory of Sichuan Province Chengdu Institute of Organic Chemistry Chinese Academy of Sciences Chengdu China
- University of Chinese Academy of Sciences Beijing China
| | - Min Li
- Asymmetric Synthesis and Chiraltechnology Key Laboratory of Sichuan Province Chengdu Institute of Organic Chemistry Chinese Academy of Sciences Chengdu China
- University of Chinese Academy of Sciences Beijing China
| | - Min Liu
- Asymmetric Synthesis and Chiraltechnology Key Laboratory of Sichuan Province Chengdu Institute of Organic Chemistry Chinese Academy of Sciences Chengdu China
- University of Chinese Academy of Sciences Beijing China
| | - Min Huang
- Asymmetric Synthesis and Chiraltechnology Key Laboratory of Sichuan Province Chengdu Institute of Organic Chemistry Chinese Academy of Sciences Chengdu China
- University of Chinese Academy of Sciences Beijing China
| | - Lianyi Cao
- Asymmetric Synthesis and Chiraltechnology Key Laboratory of Sichuan Province Chengdu Institute of Organic Chemistry Chinese Academy of Sciences Chengdu China
- University of Chinese Academy of Sciences Beijing China
| | - Wenzhe Li
- Asymmetric Synthesis and Chiraltechnology Key Laboratory of Sichuan Province Chengdu Institute of Organic Chemistry Chinese Academy of Sciences Chengdu China
- University of Chinese Academy of Sciences Beijing China
| | - Xiaomei Zhang
- Asymmetric Synthesis and Chiraltechnology Key Laboratory of Sichuan Province Chengdu Institute of Organic Chemistry Chinese Academy of Sciences Chengdu China
- University of Chinese Academy of Sciences Beijing China
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4
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Zheng Y, Fang X, Deng WH, Zhao B, Liao RZ, Xie Y. Direct activation of alcohols via perrhenate ester formation for an intramolecular dehydrative Friedel–Crafts reaction. Org Chem Front 2022. [DOI: 10.1039/d2qo00229a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A general and highly efficient intramolecular dehydrative Friedel–Crafts reactions via Re2O7 mediated hydroxyl group activation is described for the syntheses of tetrahydronaphthalene, tetrahydroquinoline, tetrahydroisoquinoline, chromane, and isochromane derivatives.
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Affiliation(s)
- Yuzhu Zheng
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Xiong Fang
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Wen-Hao Deng
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Bin Zhao
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Rong-Zhen Liao
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Youwei Xie
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
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5
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Kamitanaka T, Tsunoda Y, Fujita Y, Dohi T, Kita Y. [3 + 2] Coupling of Quinone Monoacetals with Vinyl Ethers Effected by Tetrabutylammonium Triflate: Regiocontrolled Synthesis of 2-Oxygenated Dihydrobenzofurans. Org Lett 2021; 23:9025-9029. [PMID: 34748356 DOI: 10.1021/acs.orglett.1c02792] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The synthesis of 2-oxygenated dihydrobenzofurans involving the [3 + 2] coupling of quinone monoacetals with vinyl ethers has been realized by tetrabutylammonium triflate catalysis. The reaction involves a new activation method of the acetal moiety in quinone monoacetals under acid-free conditions affording the highly oxygenated dihydrobenzofurans. This new activation mode was achieved by using the triflate anion catalyst for stabilization of the highly reactive cationic intermediate.
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Affiliation(s)
- Tohru Kamitanaka
- Research Organization of Science and Technology, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan
| | - Yusuke Tsunoda
- College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan
| | - Yuriko Fujita
- College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan
| | - Toshifumi Dohi
- Research Organization of Science and Technology, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan.,College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan
| | - Yasuyuki Kita
- Research Organization of Science and Technology, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan
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6
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Wang X, Li G, Li X, Zhu D, Shen R. One-pot three-component reaction of p-quinone monoacetals, l-proline and naphthols to afford N-aryl-2-arylpyrrolidines. Org Chem Front 2021. [DOI: 10.1039/d0qo01294g] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A one-pot three-component reaction of p-quinone monoacetals (or p-quinol ethers), l-proline and naphthols is developed for the synthesis of N-aryl-2-arylpyrrolidines under mild conditions with high chemo- and regioselectivity.
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Affiliation(s)
- Xin Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemistry and Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- China
| | - Gang Li
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemistry and Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- China
| | - Xiaojie Li
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemistry and Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- China
| | - Dunru Zhu
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemistry and Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- China
| | - Ruwei Shen
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemistry and Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- China
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7
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Tamura O, Morita N, Ikeda K, Chiaki H, Araki R, Tanaka III K, Hashimoto Y. Gold-Catalyzed Formal [3+2] Cycloaddition of p-Quinones and 1-Phenylpropenes in Ionic Liquid: Environmentally Friendly and Stereoselective Synthesis of 2,3-Dihydrobenzofuran Neolignans. HETEROCYCLES 2021. [DOI: 10.3987/com-20-s(k)71] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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8
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Wang X, Zhang C, Shen R, Han LB. Three-Component Reactions of α-Amino Acids, p-Quinone Monoacetals, and Diarylphosphine Oxides to Selectively Afford 3-(Diarylphosphinyl)anilides and N-Aryl-2-diarylphosphinylpyrrolidines. J Org Chem 2020; 85:14753-14762. [PMID: 32223168 DOI: 10.1021/acs.joc.9b03426] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The three-component reactions of α-amino acids, p-quinone monoacetals (or p-quinol ethers), and diarylphosphine oxides have been developed for the synthesis of 3-(diarylphosphinyl) anilides and N-aryl-2-diarylphosphinylpyrrolidines. The transformations may involve the in situ generation of conjugated azomethine ylides or 2-azaallyl anion species from the reaction of α-amino acids and p-quinone monoacetals, which are further trapped by diarylphosphine oxides.
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Affiliation(s)
- Xin Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Can Zhang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Ruwei Shen
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Li-Biao Han
- National Institute of Advanced Industrial Science & Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
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9
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Chandra G, Patel S. Molecular Complexity from Aromatics: Recent Advances in the Chemistry of
para
Quinol and Masked
para
‐Quinone Monoketal. ChemistrySelect 2020. [DOI: 10.1002/slct.202003802] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Girish Chandra
- Department of Chemistry School of Physical and Chemical Sciences Central University of South Bihar SH-7, Gaya-Panchanpur Road Gaya Bihar India 824236
| | - Samridhi Patel
- Department of Chemistry School of Physical and Chemical Sciences Central University of South Bihar SH-7, Gaya-Panchanpur Road Gaya Bihar India 824236
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10
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Bashir MA, Zuo H, Lu X, Wu Y, Zhong F. Harnessing structurally unbiased ortho-benzoquinone monoimine for biomimetic oxidative [4+2] cycloaddition with enamines. Chem Commun (Camb) 2020; 56:5965-5968. [DOI: 10.1039/d0cc01813a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reported herein is the first catalytic oxidative [4+2] cycloaddition of 2-aminophenols with cyclic enamines.
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Affiliation(s)
- Muhammad Adnan Bashir
- Key laboratory of Material Chemistry for Energy Conversion and Storage
- Ministry of Education
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology (HUST)
| | - Honghua Zuo
- Key laboratory of Material Chemistry for Energy Conversion and Storage
- Ministry of Education
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology (HUST)
| | - Xunbo Lu
- Key laboratory of Material Chemistry for Energy Conversion and Storage
- Ministry of Education
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology (HUST)
| | - Yuzhou Wu
- Key laboratory of Material Chemistry for Energy Conversion and Storage
- Ministry of Education
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology (HUST)
| | - Fangrui Zhong
- Key laboratory of Material Chemistry for Energy Conversion and Storage
- Ministry of Education
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology (HUST)
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11
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Pozhydaiev V, Power M, Gandon V, Moran J, Lebœuf D. Exploiting hexafluoroisopropanol (HFIP) in Lewis and Brønsted acid-catalyzed reactions. Chem Commun (Camb) 2020; 56:11548-11564. [PMID: 32930690 DOI: 10.1039/d0cc05194b] [Citation(s) in RCA: 143] [Impact Index Per Article: 35.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Hexafluoroisopropanol (HFIP) is a solvent with unique properties that has recently gained attention for promoting a wide range of challenging chemical reactions. It was initially believed that HFIP was almost exclusively involved in the stabilization of cationic intermediates, owing to its high polarity and low nucleophilicity. However, in many cases, the mechanism of action of HFIP appears to be more complex. Recent findings reveal that many Lewis and Brønsted acid-catalyzed transformations conducted in HFIP additionally involve cooperation between the catalyst and HFIP hydrogen-bond clusters, akin to Lewis- or Brønsted acid-assisted-Brønsted acid catalysis. This feature article showcases the remarkable versatility of HFIP in Lewis and Brønsted acid-catalyzed reactions, with an emphasis on examples yielding mechanistic insight.
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Affiliation(s)
- Valentyn Pozhydaiev
- Institut de Science et d'Ingénierie Supramoléculaires (ISIS), CNRS UMR 7006, Université de Strasbourg, 67000 Strasbourg, France.
| | - Martin Power
- Institut de Science et d'Ingénierie Supramoléculaires (ISIS), CNRS UMR 7006, Université de Strasbourg, 67000 Strasbourg, France.
| | - Vincent Gandon
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS UMR 8182, Université Paris-Saclay, 91405 Orsay, France
| | - Joseph Moran
- Institut de Science et d'Ingénierie Supramoléculaires (ISIS), CNRS UMR 7006, Université de Strasbourg, 67000 Strasbourg, France.
| | - David Lebœuf
- Institut de Science et d'Ingénierie Supramoléculaires (ISIS), CNRS UMR 7006, Université de Strasbourg, 67000 Strasbourg, France.
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12
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Shen R, Wang X, Zhang S, Dong C, Zhu D, Han L. Three‐Component Reaction of
p
‐Quinone Monoacetals, Amines and Diarylphosphine Oxides to Afford
m‐
(Phosphinyl)anilides. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201901421] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Ruwei Shen
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical EngineeringNanjing Tech University Nanjing 211800 People's Republic of China
| | - Xin Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical EngineeringNanjing Tech University Nanjing 211800 People's Republic of China
| | - Shunlin Zhang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical EngineeringNanjing Tech University Nanjing 211800 People's Republic of China
| | - Chao Dong
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical EngineeringNanjing Tech University Nanjing 211800 People's Republic of China
| | - Dunru Zhu
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical EngineeringNanjing Tech University Nanjing 211800 People's Republic of China
| | - Li‐Biao Han
- National Institute of Advanced Industrial Science & Technology (AIST), Tsukuba Ibaraki 305-8565 Japan
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13
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Xiong B, Wang G, Zhou C, Liu Y, Yang CA, Zhang P, Tang K, Zhou Q. Organocatalytic, regioselective allylic- and 1,6-substitution of quinone monoketals with diaryl H-phosphine oxides. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2018.12.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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14
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Hori M, Yanagi T, Murakami K, Nogi K, Yorimitsu H. Annulative Synthesis of Benzofurans from General Alkenyl Sulfoxides and Phenols via Pummerer/Sigmatropic Cascade. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2019. [DOI: 10.1246/bcsj.20180321] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Mitsuki Hori
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Tomoyuki Yanagi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Kei Murakami
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Keisuke Nogi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
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15
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Zhang M, Jia X, Zhu H, Fang X, Ji C, Zhao S, Han LB, Shen R. Zinc-catalyzed regioselective C–P coupling of p-quinol ethers with secondary phosphine oxides to afford 2-phosphinylphenols. Org Biomol Chem 2019; 17:2972-2984. [DOI: 10.1039/c9ob00129h] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A highly regioselective C–P coupling reaction of p-quinol ethers with secondary phosphine oxides is developed as a new synthesis method for 2-phosphinylphenols by using Zn(OTf)2 as the catalyst.
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Affiliation(s)
- Ming Zhang
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- China
| | - Xiaoyu Jia
- College of Oversea Education
- Nanjing Tech University
- Nanjing 210009
- China
| | - Haowei Zhu
- College of Oversea Education
- Nanjing Tech University
- Nanjing 210009
- China
| | - Xutong Fang
- College of Oversea Education
- Nanjing Tech University
- Nanjing 210009
- China
| | - Chenyi Ji
- College of Oversea Education
- Nanjing Tech University
- Nanjing 210009
- China
| | - Sizhuo Zhao
- College of Oversea Education
- Nanjing Tech University
- Nanjing 210009
- China
| | - Li-Biao Han
- National Institute of Advanced Industrial Science & Technology (AIST)
- Tsukuba
- Japan
| | - Ruwei Shen
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- China
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16
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Liu L, Lei LS, Zhan ZS, Liu SZ, Wang YX, Tu YQ, Zhang FM, Zhang XM, Ma AJ, Wang SH. A catalytic asymmetric one-pot [3+2] cyclization/semipinacol rearrangement sequence: an efficient construction of a multi-substituted 3H-spiro[benzofuran-2,1′-cyclopentane] skeleton. Chem Commun (Camb) 2019; 55:3789-3792. [DOI: 10.1039/c9cc00811j] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report an asymmetric construction of multi-substituted 3H-spiro[benzofuran-2,1’-cyclopentane]s with three new stereocenters and two new ring systems.
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Affiliation(s)
- Lin Liu
- State Key Laboratory of Applied Organic Chemistry & School of Pharmacy
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Lin-Sheng Lei
- State Key Laboratory of Applied Organic Chemistry & School of Pharmacy
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Zong-Song Zhan
- State Key Laboratory of Applied Organic Chemistry & School of Pharmacy
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Si-Zhan Liu
- State Key Laboratory of Applied Organic Chemistry & School of Pharmacy
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Yu-Xiao Wang
- State Key Laboratory of Applied Organic Chemistry & School of Pharmacy
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Yong-Qiang Tu
- State Key Laboratory of Applied Organic Chemistry & School of Pharmacy
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Fu-Min Zhang
- State Key Laboratory of Applied Organic Chemistry & School of Pharmacy
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Xiao-Ming Zhang
- State Key Laboratory of Applied Organic Chemistry & School of Pharmacy
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Ai-Jun Ma
- School of Biotechnology and Health Science
- Wuyi University
- Jiangmen 529020
- P. R. China
| | - Shao-Hua Wang
- State Key Laboratory of Applied Organic Chemistry & School of Pharmacy
- Lanzhou University
- Lanzhou 730000
- P. R. China
- School of Biotechnology and Health Science
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17
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Henry MC, Senn HM, Sutherland A. Synthesis of Functionalized Indolines and Dihydrobenzofurans by Iron and Copper Catalyzed Aryl C-N and C-O Bond Formation. J Org Chem 2018; 84:346-364. [PMID: 30520304 DOI: 10.1021/acs.joc.8b02888] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A simple and effective one-pot, two-step intramolecular aryl C-N and C-O bond forming process for the preparation of a wide range of benzo-fused heterocyclic scaffolds using iron and copper catalysis is described. Activated aryl rings were subjected to a highly regioselective, iron(III) triflimide-catalyzed iodination, followed by a copper(I)-catalyzed intramolecular N- or O-arylation step leading to indolines, dihydrobenzofurans, and six-membered analogues. The general applicability and functional group tolerance of this method were exemplified by the total synthesis of the neolignan natural product, (+)-obtusafuran. DFT calculations using Fukui functions were also performed, providing a molecular orbital rationale for the highly regioselective arene iodination process.
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Affiliation(s)
- Martyn C Henry
- WestCHEM, School of Chemistry, The Joseph Black Building , University of Glasgow , Glasgow G12 8QQ , United Kingdom
| | - Hans Martin Senn
- WestCHEM, School of Chemistry, The Joseph Black Building , University of Glasgow , Glasgow G12 8QQ , United Kingdom
| | - Andrew Sutherland
- WestCHEM, School of Chemistry, The Joseph Black Building , University of Glasgow , Glasgow G12 8QQ , United Kingdom
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18
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Feng W, Yang H, Wang Z, Gou BB, Chen J, Zhou L. Enantioselective [3 + 2] Formal Cycloaddition of 1-Styrylnaphthols with Quinones Catalyzed by a Chiral Phosphoric Acid. Org Lett 2018; 20:2929-2933. [DOI: 10.1021/acs.orglett.8b00988] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Wang Feng
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, Northwest University, Xi’an 710127, P. R. China
| | - Hui Yang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, Northwest University, Xi’an 710127, P. R. China
| | - Zhe Wang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, Northwest University, Xi’an 710127, P. R. China
| | - Bo-Bo Gou
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, Northwest University, Xi’an 710127, P. R. China
| | - Jie Chen
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, Northwest University, Xi’an 710127, P. R. China
| | - Ling Zhou
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, Northwest University, Xi’an 710127, P. R. China
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19
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Arnold AM, Pöthig A, Drees M, Gulder T. NXS, Morpholine, and HFIP: The Ideal Combination for Biomimetic Haliranium-Induced Polyene Cyclizations. J Am Chem Soc 2018; 140:4344-4353. [PMID: 29412652 DOI: 10.1021/jacs.8b00113] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
In contrast to Nature that accomplishes polyene cyclizations seemingly with ease, such transformations are difficult to conduct in the lab. In our program dealing with the development of selective halogenations of alkenes, we now asserted that standard X+ reagents are perfectly suited for the biomimetic cation-π cyclization of both electron rich and poor linear polyenes in the presence of the Lewis base morpholine and the Lewis acid HFIP. The method stands out due to its broad substrate scope and practicability together with high chemical yields and excellent selectivities, even for highly challenging chloriranium-induced polyene cyclizations.
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Affiliation(s)
- Andreas M Arnold
- Biomimetic Catalysis, Department of Chemistry , Technical University of Munich , Lichtenbergstrasse 4 , 85748 Garching , Germany.,Catalysis Research Center , Technical University of Munich , Ernst-Otto-Fischer-Straße 1 , 85748 Garching , Germany
| | - Alexander Pöthig
- Catalysis Research Center , Technical University of Munich , Ernst-Otto-Fischer-Straße 1 , 85748 Garching , Germany
| | - Markus Drees
- Catalysis Research Center , Technical University of Munich , Ernst-Otto-Fischer-Straße 1 , 85748 Garching , Germany
| | - Tanja Gulder
- Biomimetic Catalysis, Department of Chemistry , Technical University of Munich , Lichtenbergstrasse 4 , 85748 Garching , Germany.,Catalysis Research Center , Technical University of Munich , Ernst-Otto-Fischer-Straße 1 , 85748 Garching , Germany
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20
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Jacob A, Roy T, Kaicharla T, Biju AT. Metal-Free, Brønsted Acid-Catalyzed Formal [3+2] Annulation of Quinone Monoacetals with 2-Naphthols. J Org Chem 2017; 82:11269-11274. [DOI: 10.1021/acs.joc.7b02033] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Anu Jacob
- Organic
Chemistry Division, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411008, India
| | - Tony Roy
- Organic
Chemistry Division, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411008, India
- Academy of Scientific and Innovative Research (AcSIR), New Delhi 110020, India
| | - Trinadh Kaicharla
- Organic
Chemistry Division, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411008, India
- Academy of Scientific and Innovative Research (AcSIR), New Delhi 110020, India
| | - Akkattu T. Biju
- Organic
Chemistry Division, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411008, India
- Academy of Scientific and Innovative Research (AcSIR), New Delhi 110020, India
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21
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Ma C, Zhang T, Zhou JY, Mei GJ, Shi F. Catalytic asymmetric chemodivergent arylative dearomatization of tryptophols. Chem Commun (Camb) 2017; 53:12124-12127. [DOI: 10.1039/c7cc06547g] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The first catalytic asymmetric arylative dearomatization of tryptophols has been established. By using quinone imine ketals as aryl group surrogates and modulating the reaction conditions, the cascade reaction of tryptophols with quinone imine ketals afforded two series of arylative dearomatization products in generally high yields, and excellent diastereo- and enantioselectivities.
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Affiliation(s)
- Chun Ma
- School of Chemistry and Material Science
- Jiangsu Normal University
- Xuzhou
- China
| | - Ting Zhang
- School of Chemistry and Material Science
- Jiangsu Normal University
- Xuzhou
- China
| | - Jia-Yu Zhou
- School of Chemistry and Material Science
- Jiangsu Normal University
- Xuzhou
- China
| | - Guang-Jian Mei
- School of Chemistry and Material Science
- Jiangsu Normal University
- Xuzhou
- China
| | - Feng Shi
- School of Chemistry and Material Science
- Jiangsu Normal University
- Xuzhou
- China
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22
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Kamitanaka T, Morimoto K, Tsuboshima K, Koseki D, Takamuro H, Dohi T, Kita Y. Efficient Coupling Reaction of Quinone Monoacetal with Phenols Leading to Phenol Biaryls. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201608013] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Tohru Kamitanaka
- Research Organization of Science and Technology; Ritsumeikan University; 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan
| | - Koji Morimoto
- College of Pharmaceutical Sciences; Ritsumeikan University; 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan
| | - Kohei Tsuboshima
- College of Pharmaceutical Sciences; Ritsumeikan University; 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan
| | - Daichi Koseki
- College of Pharmaceutical Sciences; Ritsumeikan University; 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan
| | - Hitoho Takamuro
- College of Pharmaceutical Sciences; Ritsumeikan University; 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan
| | - Toshifumi Dohi
- College of Pharmaceutical Sciences; Ritsumeikan University; 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan
| | - Yasuyuki Kita
- Research Organization of Science and Technology; Ritsumeikan University; 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan
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23
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Kamitanaka T, Morimoto K, Tsuboshima K, Koseki D, Takamuro H, Dohi T, Kita Y. Efficient Coupling Reaction of Quinone Monoacetal with Phenols Leading to Phenol Biaryls. Angew Chem Int Ed Engl 2016; 55:15535-15538. [DOI: 10.1002/anie.201608013] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Revised: 10/02/2016] [Indexed: 01/17/2023]
Affiliation(s)
- Tohru Kamitanaka
- Research Organization of Science and Technology; Ritsumeikan University; 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan
| | - Koji Morimoto
- College of Pharmaceutical Sciences; Ritsumeikan University; 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan
| | - Kohei Tsuboshima
- College of Pharmaceutical Sciences; Ritsumeikan University; 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan
| | - Daichi Koseki
- College of Pharmaceutical Sciences; Ritsumeikan University; 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan
| | - Hitoho Takamuro
- College of Pharmaceutical Sciences; Ritsumeikan University; 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan
| | - Toshifumi Dohi
- College of Pharmaceutical Sciences; Ritsumeikan University; 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan
| | - Yasuyuki Kita
- Research Organization of Science and Technology; Ritsumeikan University; 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan
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24
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Chai Z, Chen JN, Liu Z, Li XF, Yang PJ, Hu JP, Yang G. [3 + 2]-Annulations of N-alkyl-3-substituted indoles with quinone monoketals catalysed by Brønsted acids. Org Biomol Chem 2016; 14:1024-30. [DOI: 10.1039/c5ob01876e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
An organocatalytic dearomative [3 + 2]-annulation of 3-alkylindoles and quinone monoketals provided benzofuro[2,3-b]indolines, while the reaction with 3-phenylindole leads to 2,3-diarylindoles in moderate yields.
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Affiliation(s)
- Zhuo Chai
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
- Institute of Organic Chemistry
- School of Chemistry and Materials Science
| | - Jia-Nan Chen
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
- Institute of Organic Chemistry
- School of Chemistry and Materials Science
| | - Zhen Liu
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
- Institute of Organic Chemistry
- School of Chemistry and Materials Science
| | - Xue-Fei Li
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
- Institute of Organic Chemistry
- School of Chemistry and Materials Science
| | - Pei-Jun Yang
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
- Institute of Organic Chemistry
- School of Chemistry and Materials Science
| | - Ji-Ping Hu
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
- Institute of Organic Chemistry
- School of Chemistry and Materials Science
| | - Gaosheng Yang
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
- Institute of Organic Chemistry
- School of Chemistry and Materials Science
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25
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Kita Y, Kamitanaka T, Takamuro H, Shimizu K, Aramaki Y, Dohi T. New Synthesis of Tetrahydrobenzodifurans by Iterative Coupling of Quinone Monoacetals with Alkene Nucleophiles. HETEROCYCLES 2016. [DOI: 10.3987/com-15-s(t)41] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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26
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Dohi T, Kamitanaka T, Takamuro H, Mishima Y, Washimi N, Kita Y. A new arylation of silyl enol ethers by quinone monoacetal substitution. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2014.11.085] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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27
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Jiang F, Zhang YC, Sun SB, Zhou LJ, Shi F. Organocatalytic Reactions of Indoles with Quinone Imine Ketals: An Alternative Metal-Free Approach to Bioactivemeta-Indolylanilines. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201401016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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28
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Hemelaere R, Carreaux F, Carboni B. A Diastereoselective Route totrans-2-Aryl-2,3-dihydrobenzofurans through Sequential Cross-Metathesis/Isomerization/Allylboration Reactions: Synthesis of Bioactive Neolignans. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500019] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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29
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Zhang YC, Zhao JJ, Jiang F, Sun SB, Shi F. Organocatalytic Asymmetric Arylative Dearomatization of 2,3-Disubstituted Indoles Enabled by Tandem Reactions. Angew Chem Int Ed Engl 2014; 53:13912-5. [DOI: 10.1002/anie.201408551] [Citation(s) in RCA: 179] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Indexed: 12/23/2022]
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30
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Zhang YC, Zhao JJ, Jiang F, Sun SB, Shi F. Organocatalytic Asymmetric Arylative Dearomatization of 2,3-Disubstituted Indoles Enabled by Tandem Reactions. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201408551] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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31
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Zhang YC, Jiang F, Wang SL, Shi F, Tu SJ. Organocatalytic Chemo- and Regioselective Oxyarylation of Styrenes via a Cascade Reaction: Remote Activation of Hydroxyl Groups. J Org Chem 2014; 79:6143-52. [DOI: 10.1021/jo500859b] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Yu-Chen Zhang
- School
of Chemistry and Chemical
Engineering and Jiangsu Key Laboratory of Green Synthetic Chemistry
for Functional Materials, Jiangsu Normal University, Xuzhou 221116, China
| | - Fei Jiang
- School
of Chemistry and Chemical
Engineering and Jiangsu Key Laboratory of Green Synthetic Chemistry
for Functional Materials, Jiangsu Normal University, Xuzhou 221116, China
| | - Shu-Liang Wang
- School
of Chemistry and Chemical
Engineering and Jiangsu Key Laboratory of Green Synthetic Chemistry
for Functional Materials, Jiangsu Normal University, Xuzhou 221116, China
| | - Feng Shi
- School
of Chemistry and Chemical
Engineering and Jiangsu Key Laboratory of Green Synthetic Chemistry
for Functional Materials, Jiangsu Normal University, Xuzhou 221116, China
| | - Shu-Jiang Tu
- School
of Chemistry and Chemical
Engineering and Jiangsu Key Laboratory of Green Synthetic Chemistry
for Functional Materials, Jiangsu Normal University, Xuzhou 221116, China
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32
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Yin Z, Zhang J, Wu J, Green R, Li S, Zheng S. Synthesis of o-chlorophenols via an unexpected nucleophilic chlorination of quinone monoketals mediated by N,N'-dimethylhydrazine dihydrochloride. Org Biomol Chem 2014; 12:2854-8. [PMID: 24675905 DOI: 10.1039/c4ob00391h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An unexpected nucleophilic chlorination of a quinone monoketal while carrying out a pyrazolidine synthesis has led to a general preparation of multisubstituted phenols. The products are obtained in good to high yields under mild conditions. The bridged pyrazolidines that were the original targets are obtained in the presence of a protic solvent.
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Affiliation(s)
- Zhiwei Yin
- Department of Chemistry, Hunter College, 695 Park Avenue, New York, NY 10065, USA
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33
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Lebleu T, Ma X, Maddaluno J, Legros J. Selective monomethylation of primary amines with simple electrophiles. Chem Commun (Camb) 2014; 50:1836-8. [DOI: 10.1039/c3cc48997c] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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34
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Hashimoto T, Nakatsu H, Takiguchi Y, Maruoka K. Axially Chiral Dicarboxylic Acid Catalyzed Activation of Quinone Imine Ketals: Enantioselective Arylation of Enecarbamates. J Am Chem Soc 2013; 135:16010-3. [DOI: 10.1021/ja407501h] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Takuya Hashimoto
- Department
of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Hiroki Nakatsu
- Department
of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Yuka Takiguchi
- Department
of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Keiji Maruoka
- Department
of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan
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35
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