151
|
Anwar M, Yang S, Xu W, Liu J, Perveen S, Kong X, Zehra ST, Fang X. Carbene-catalyzed asymmetric Friedel–Crafts alkylation-annulation sequence and rapid synthesis of indole-fused polycyclic alkaloids. Commun Chem 2019. [DOI: 10.1038/s42004-019-0188-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
|
152
|
Zhao ZB, Shi L, Li Y, Meng FJ, Zhou YG. Facile synthesis of chiral ε-sultams via an organocatalytic aza-Friedel-Crafts reaction. Org Biomol Chem 2019; 17:6364-6368. [PMID: 31225577 DOI: 10.1039/c9ob01158g] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Chiral ε-sultams, with their unique strain cyclic structure, are a type of molecule with important biological activities. A facile enantioselective aza-Friedel-Crafts reaction of seven-membered cyclic N-sulfonylimines with naphthols was developed with a cinchona alkaloid-based bifunctional organocatalyst, giving chiral ε-sultams with an enantiomeric excess of up to 92%.
Collapse
Affiliation(s)
- Zi-Biao Zhao
- State Key Laboratory of Fine Chemicals, Zhang Dayu School of Chemistry, Dalian University of Technology, 2 Linggong Road, Dalian 116024, P. R. China. and State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China.
| | - Lei Shi
- State Key Laboratory of Fine Chemicals, Zhang Dayu School of Chemistry, Dalian University of Technology, 2 Linggong Road, Dalian 116024, P. R. China.
| | - Yaming Li
- State Key Laboratory of Fine Chemicals, Zhang Dayu School of Chemistry, Dalian University of Technology, 2 Linggong Road, Dalian 116024, P. R. China.
| | - Fan-Jie Meng
- State Key Laboratory of Fine Chemicals, Zhang Dayu School of Chemistry, Dalian University of Technology, 2 Linggong Road, Dalian 116024, P. R. China.
| | - Yong-Gui Zhou
- State Key Laboratory of Fine Chemicals, Zhang Dayu School of Chemistry, Dalian University of Technology, 2 Linggong Road, Dalian 116024, P. R. China. and State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China.
| |
Collapse
|
153
|
Tarasenko EA, Shestakov IV, Rybakov VB, Beletskaya IP. Enantioselective Copper(II)/Box‐Catalyzed Synthesis of Chiral
β
3
‐Tryptophan Derivatives. ChemCatChem 2019. [DOI: 10.1002/cctc.201900575] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Elena A. Tarasenko
- Department of ChemistryM. V. Lomonosov Moscow State University Leninskie Gory, GSP-1 Moscow 119991 Russian Federation
| | - Ivan V. Shestakov
- Department of ChemistryM. V. Lomonosov Moscow State University Leninskie Gory, GSP-1 Moscow 119991 Russian Federation
| | - Victor B. Rybakov
- Department of ChemistryM. V. Lomonosov Moscow State University Leninskie Gory, GSP-1 Moscow 119991 Russian Federation
| | - Irina P. Beletskaya
- Department of ChemistryM. V. Lomonosov Moscow State University Leninskie Gory, GSP-1 Moscow 119991 Russian Federation
| |
Collapse
|
154
|
Wei Z, Zhang J, Yang H, Jiang G. Brønsted Acid‐Catalyzed Asymmetric Ring‐Closing Alkylation of Inert N‐substituted Pyrroles with α, β‐Unsaturated Ketones. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900546] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Zhao Wei
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Su-zhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP)Chinese Academy of Sciences Lan-zhou 730000 People's Republic of China
- University of Chinese Academy of Sciences Beijing 100049 People's Republic of China
| | - Jinlong Zhang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Su-zhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP)Chinese Academy of Sciences Lan-zhou 730000 People's Republic of China
| | - Huameng Yang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Su-zhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP)Chinese Academy of Sciences Lan-zhou 730000 People's Republic of China
| | - Gaoxi Jiang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Su-zhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP)Chinese Academy of Sciences Lan-zhou 730000 People's Republic of China
| |
Collapse
|
155
|
Zhang J, Hazra CK, Park S, Chang S. Metal‐Free Carbocyclization of Homoallylic Silyl Ethers Leading to Cyclopropanes and Cyclobutanes. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900270] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Jianbo Zhang
- Center for Catalytic Hydrocarbon FunctionalizationsInstitute for Basic Science (IBS) Daejeon 34141 South Korea
- Department of ChemistryKorea Advanced Institute of Science & Technology (KAIST) Daejeon 34141 South Korea
| | - Chinmoy Kumar Hazra
- Center for Catalytic Hydrocarbon FunctionalizationsInstitute for Basic Science (IBS) Daejeon 34141 South Korea
- Department of ChemistryKorea Advanced Institute of Science & Technology (KAIST) Daejeon 34141 South Korea
| | - Sehoon Park
- Center for Catalytic Hydrocarbon FunctionalizationsInstitute for Basic Science (IBS) Daejeon 34141 South Korea
- Department of ChemistryKorea Advanced Institute of Science & Technology (KAIST) Daejeon 34141 South Korea
| | - Sukbok Chang
- Center for Catalytic Hydrocarbon FunctionalizationsInstitute for Basic Science (IBS) Daejeon 34141 South Korea
- Department of ChemistryKorea Advanced Institute of Science & Technology (KAIST) Daejeon 34141 South Korea
| |
Collapse
|
156
|
Huang T, Zhao Y, Meng S, Chan ASC, Zhao J. C7‐Functionalization of Indoles via Organocatalytic Enantioselective Friedel‐Crafts Alkylation of 4‐Amino‐ indoles with 2‐Butene‐1,4‐diones and 3‐Aroylacrylates. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900377] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Tongkun Huang
- School of Pharmaceutical SciencesSun Yat-sen University Guangzhou 510006 People's Republic of China
| | - Yunlong Zhao
- School of Pharmaceutical SciencesSun Yat-sen University Guangzhou 510006 People's Republic of China
| | - Shanshui Meng
- School of Pharmaceutical SciencesSun Yat-sen University Guangzhou 510006 People's Republic of China
| | - Albert S. C. Chan
- School of Pharmaceutical SciencesSun Yat-sen University Guangzhou 510006 People's Republic of China
| | - Junling Zhao
- School of Pharmaceutical SciencesSun Yat-sen University Guangzhou 510006 People's Republic of China
| |
Collapse
|
157
|
Maji B. Stereoselective Haliranium, Thiiranium and Seleniranium Ion‐Triggered Friedel–Crafts‐Type Alkylations for Polyene Cyclizations. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900028] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Biswajit Maji
- Department of ChemistryIndira Gandhi National Tribal University Amarkantak – 484886 Madhya Pradesh India
| |
Collapse
|
158
|
Cheng X, Shan J, Tian X, Ren YL, Zhu Y. Benzylation of Arenes with Benzyl Halides under Promoter-Free and Additive-Free Conditions. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900590] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Xinqiang Cheng
- School of Chemical Engineering & Pharmaceutics; Henan University of Science and Technology; Luoyang 471003 Henan P. R. China
| | - Jiankai Shan
- College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou 450001 Henan Province P.R. China
| | - Xinshe Tian
- School of Chemical Engineering & Pharmaceutics; Henan University of Science and Technology; Luoyang 471003 Henan P. R. China
| | - Yun-Lai Ren
- School of Chemical Engineering & Pharmaceutics; Henan University of Science and Technology; Luoyang 471003 Henan P. R. China
| | - Yanyan Zhu
- College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou 450001 Henan Province P.R. China
| |
Collapse
|
159
|
Yang H, Zheng WH. Parallel Kinetic Resolution of Unsymmetrical Acyclic Aliphatic syn-1,3-Diols. Org Lett 2019; 21:5197-5200. [PMID: 31247762 DOI: 10.1021/acs.orglett.9b01801] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Disclosed is a mild, reliable, and enantioselective catalytic parallel kinetic resolution of unsymmetrical acyclic aliphatic syn-1,3-diol derived acetals mediated by chiral phosphoric acid. This method provides stereoselective access to a variety of syn-1,3-diols as valuable building blocks with high enantioselectivity. Moreover, this mild system allows for site-selective protection of optically pure syn-1,3-diols in excellent regioselectivity.
Collapse
Affiliation(s)
- Hui Yang
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering , Nanjing University , 163 Xianlin Avenue , Nanjing 210023 , Jiangsu , China
| | - Wen-Hua Zheng
- State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering , Nanjing University , 163 Xianlin Avenue , Nanjing 210023 , Jiangsu , China
| |
Collapse
|
160
|
Li YP, Li ZQ, Zhou B, Li ML, Xue XS, Zhu SF, Zhou QL. Chiral Spiro Phosphoric Acid-Catalyzed Friedel–Crafts Conjugate Addition/Enantioselective Protonation Reactions. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01502] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Yi-Pan Li
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Zi-Qi Li
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Biying Zhou
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Mao-Lin Li
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Xiao-Song Xue
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Shou-Fei Zhu
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Qi-Lin Zhou
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| |
Collapse
|
161
|
Grugel CP, Breit B. Rhodium-Catalyzed Enantioselective Cyclization of 3-Allenyl-indoles: Access to Functionalized Tetrahydrocarbazoles. Org Lett 2019; 21:5798-5802. [PMID: 31136189 DOI: 10.1021/acs.orglett.9b01721] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A highly selective rhodium-catalyzed cyclization of tethered 3-allenylindoles is reported. In a smooth reaction, 1-vinyltetrahydrocarbazoles are obtained in excellent yields and enantioselectivities. Aside from a great functional group tolerance, this method requires neither the Schlenk technique nor the use of anhydrous solvents. Preliminary mechanistic investigations proved that the reaction proceeds via an intermediary formed spiroindolenine which rapidly undergoes an acid-catalyzed stereospecific migration.
Collapse
Affiliation(s)
- Christian P Grugel
- Institut für Organische Chemie , Albert-Ludwigs-Universität Freiburg , Albertrstr. 21 , Freiburg 79104 , Germany
| | - Bernhard Breit
- Institut für Organische Chemie , Albert-Ludwigs-Universität Freiburg , Albertrstr. 21 , Freiburg 79104 , Germany
| |
Collapse
|
162
|
Staleva P, Hernández JG, Bolm C. Mechanochemical Copper-Catalyzed Asymmetric Michael-Type Friedel-Crafts Alkylation of Indoles with Arylidene Malonates. Chemistry 2019; 25:9202-9205. [PMID: 31106927 DOI: 10.1002/chem.201901826] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Revised: 05/18/2019] [Indexed: 12/12/2022]
Abstract
A mechanochemical version of the asymmetric Michael-type Friedel-Crafts alkylation of indoles with arylidene malonates was developed. The reaction proceeds under ambient atmosphere using a chiral bis(oxazoline)copper catalyst in a mixer mill. Under these reaction conditions nineteen 3-substituted indole derivatives were synthesized in good to excellent yields (up to 98 %), and with good enantioselectivities (up to 91:9 e.r.) after short milling times.
Collapse
Affiliation(s)
- Plamena Staleva
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - José G Hernández
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Carsten Bolm
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| |
Collapse
|
163
|
Xie E, Huang S, Lin X. Design of Planar Chiral Phosphoric Acids with a [2.2]Paracyclophanyl Backbone as Organocatalysts for the Highly Enantioselective Aza-Friedel–Crafts Reaction. Org Lett 2019; 21:3682-3686. [DOI: 10.1021/acs.orglett.9b01127] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- En Xie
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Shaoying Huang
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Xufeng Lin
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| |
Collapse
|
164
|
Obydennov DL, Chernyshova EV, Sosnovskikh VY. Self-Condensation of Enaminodiones as a Method for Benzene Ring Construction: Synthesis of Diacyl-Substituted Phenols and Catechols. J Org Chem 2019; 84:6491-6501. [DOI: 10.1021/acs.joc.9b00623] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Dmitrii L. Obydennov
- Institute of Natural Sciences and Mathematics, Ural Federal University, 620000 Ekaterinburg, Russian Federation
| | - Elena V. Chernyshova
- Institute of Natural Sciences and Mathematics, Ural Federal University, 620000 Ekaterinburg, Russian Federation
| | - Vyacheslav Y. Sosnovskikh
- Institute of Natural Sciences and Mathematics, Ural Federal University, 620000 Ekaterinburg, Russian Federation
| |
Collapse
|
165
|
Lin JS, Li TT, Jiao GY, Gu QS, Cheng JT, Lv L, Liu XY. Chiral Brønsted Acid Catalyzed Dynamic Kinetic Asymmetric Hydroamination of Racemic Allenes and Asymmetric Hydroamination of Dienes. Angew Chem Int Ed Engl 2019; 58:7092-7096. [PMID: 30919531 DOI: 10.1002/anie.201900955] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 03/19/2019] [Indexed: 12/31/2022]
Abstract
The first highly efficient and practical chiral Brønsted acid catalyzed dynamic kinetic asymmetric hydroamination (DyKAH) of racemic allenes and asymmetric hydroamination of unactivated dienes with both high E/Z selectivity and enantioselectivity are described herein. The transformation proceeds through a new catalytic asymmetric model involving a highly reactive π-allylic carbocationic intermediate, generated from racemic allenes or dienes through a proton transfer mediated by an activating/directing thiourea group. This method affords expedient access to structurally diverse enantioenriched, potentially bioactive alkenyl-containing aza-heterocycles and bicyclic aza-heterocycles.
Collapse
Affiliation(s)
- Jin-Shun Lin
- State Key Laboratory of Chemical Oncogenomics, Key Laboratory of Chemical Biology, Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, China.,Department of Chemistry, Tsinghua University, Beijing, 100084, China.,Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Tao-Tao Li
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Guan-Yuan Jiao
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Qiang-Shuai Gu
- Academy for Advanced Interdisciplinary Studies and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Jiang-Tao Cheng
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Ling Lv
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Xin-Yuan Liu
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen, 518055, China
| |
Collapse
|
166
|
Lin J, Li T, Jiao G, Gu Q, Cheng J, Lv L, Liu X. Chiral Brønsted Acid Catalyzed Dynamic Kinetic Asymmetric Hydroamination of Racemic Allenes and Asymmetric Hydroamination of Dienes. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201900955] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jin‐Shun Lin
- State Key Laboratory of Chemical OncogenomicsKey Laboratory of Chemical BiologyGraduate School at ShenzhenTsinghua University Shenzhen 518055 China
- Department of ChemistryTsinghua University Beijing 100084 China
- Department of Chemistry and Shenzhen Grubbs InstituteSouthern University of Science and Technology Shenzhen 518055 China
| | - Tao‐Tao Li
- Department of Chemistry and Shenzhen Grubbs InstituteSouthern University of Science and Technology Shenzhen 518055 China
| | - Guan‐Yuan Jiao
- Department of Chemistry and Shenzhen Grubbs InstituteSouthern University of Science and Technology Shenzhen 518055 China
| | - Qiang‐Shuai Gu
- Academy for Advanced Interdisciplinary Studies and Department of ChemistrySouthern University of Science and Technology Shenzhen 518055 China
| | - Jiang‐Tao Cheng
- Department of Chemistry and Shenzhen Grubbs InstituteSouthern University of Science and Technology Shenzhen 518055 China
| | - Ling Lv
- Department of Chemistry and Shenzhen Grubbs InstituteSouthern University of Science and Technology Shenzhen 518055 China
| | - Xin‐Yuan Liu
- Department of Chemistry and Shenzhen Grubbs InstituteSouthern University of Science and Technology Shenzhen 518055 China
| |
Collapse
|
167
|
Wang Z, Zeng H, Li CJ. Dearomatization–Rearomatization Strategy for Reductive Cross-Coupling of Indoles with Ketones in Water. Org Lett 2019; 21:2302-2306. [PMID: 30908058 DOI: 10.1021/acs.orglett.9b00591] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zemin Wang
- The State Key Laboratory of Applied Organic Chemistry, Lanzhou University, 222 Tianshui Road, Lanzhou 730000, People’s Republic of China
| | - Huiying Zeng
- The State Key Laboratory of Applied Organic Chemistry, Lanzhou University, 222 Tianshui Road, Lanzhou 730000, People’s Republic of China
| | - Chao-Jun Li
- Department of Chemistry and FQRNT Centre for Green Chemistry and Catalysis, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 0B8, Canada
| |
Collapse
|
168
|
Das A, Anbu N, SK M, Dhakshinamoorthy A, Biswas S. Highly Active Urea-Functionalized Zr(IV)-UiO-67 Metal–Organic Framework as Hydrogen Bonding Heterogeneous Catalyst for Friedel–Crafts Alkylation. Inorg Chem 2019; 58:5163-5172. [DOI: 10.1021/acs.inorgchem.9b00259] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Aniruddha Das
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039 Assam, India
| | - Nagaraj Anbu
- School of Chemistry, Madurai Kamaraj University, Madurai 625021, Tamil Nadu, India
| | - Mostakim SK
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039 Assam, India
| | | | - Shyam Biswas
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039 Assam, India
| |
Collapse
|
169
|
Heravi MM, Zadsirjan V, Heydari M, Masoumi B. Organocatalyzed Asymmetric Friedel‐Crafts Reactions: An Update. CHEM REC 2019. [DOI: 10.1002/tcr.201800190] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Majid M. Heravi
- Department of ChemistrySchool of ScienceAlzahra University POBox 1993891176, Vanak Tehran Iran Tel.: +98 21 88044051 fax: +98 21 88041344
| | - Vahideh Zadsirjan
- Department of ChemistrySchool of ScienceAlzahra University POBox 1993891176, Vanak Tehran Iran Tel.: +98 21 88044051 fax: +98 21 88041344
| | - Masumeh Heydari
- Department of ChemistrySchool of ScienceAlzahra University POBox 1993891176, Vanak Tehran Iran Tel.: +98 21 88044051 fax: +98 21 88041344
| | - Baharak Masoumi
- Department of ChemistrySchool of ScienceAlzahra University POBox 1993891176, Vanak Tehran Iran Tel.: +98 21 88044051 fax: +98 21 88041344
| |
Collapse
|
170
|
Carmona M, Rodríguez R, Passarelli V, Carmona D. Mechanism of the Alkylation of Indoles with Nitrostyrenes Catalyzed by Chiral-at-Metal Complexes. Organometallics 2019. [DOI: 10.1021/acs.organomet.8b00925] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- María Carmona
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Departamento de Química Inorgánica, Pedro Cerbuna 12, E-50009 Zaragoza, Spain
| | - Ricardo Rodríguez
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Departamento de Química Inorgánica, Pedro Cerbuna 12, E-50009 Zaragoza, Spain
| | - Vincenzo Passarelli
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Departamento de Química Inorgánica, Pedro Cerbuna 12, E-50009 Zaragoza, Spain
- Centro Universitario de la Defensa Ctra., Huesca s/n, 50090 Zaragoza, Spain
| | - Daniel Carmona
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Departamento de Química Inorgánica, Pedro Cerbuna 12, E-50009 Zaragoza, Spain
| |
Collapse
|
171
|
Rahman A, Xie E, Lin X. Organocatalytic asymmetric synthesis of benzazepinoindole derivatives with trifluoromethylated quaternary stereocenters by chiral phosphoric acid catalysts. Org Biomol Chem 2019; 16:1367-1374. [PMID: 29406543 DOI: 10.1039/c8ob00055g] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
An enantioselective aza-Friedel-Crafts reaction of trifluoromethyl dihydrobenzoazepinoindoles with pyrroles catalyzed by a chiral spirocyclic phosphoric acid was developed. This methodology provides a facile route to CF3- and pyrrole-containing benzazepinoindoles bearing quaternary stereocenters in good yields and with moderate to excellent enantioselectivities (up to 93% ee). Indoles were also investigated as electron-rich aromatic substrates to afford the corresponding chiral heterocycles with good yields and considerable enantioselectivities. The introduction of CF3 shows a remarkable fluorine effect and increases the activation and stereoinduction.
Collapse
Affiliation(s)
- Abdul Rahman
- Laboratory of Asymmetric Catalysis and Synthesis, Department of Chemistry, Zhejiang University, Hangzhou 310027, China.
| | | | | |
Collapse
|
172
|
Gambaro S, De Rosa M, Soriente A, Talotta C, Floresta G, Rescifina A, Gaeta C, Neri P. A hexameric resorcinarene capsule as a hydrogen bonding catalyst in the conjugate addition of pyrroles and indoles to nitroalkenes. Org Chem Front 2019. [DOI: 10.1039/c9qo00224c] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A hexameric resorcinarene capsule (C) acts as a hydrogen bonding catalyst for the addition of nitroalkenes to pyrroles and indoles.
Collapse
Affiliation(s)
- Stefania Gambaro
- Dipartimento di Chimica e Biologia “A. Zambelli”
- Università degli Studi di Salerno
- I-84084 Fisciano
- Italy
| | - Margherita De Rosa
- Dipartimento di Chimica e Biologia “A. Zambelli”
- Università degli Studi di Salerno
- I-84084 Fisciano
- Italy
| | - Annunziata Soriente
- Dipartimento di Chimica e Biologia “A. Zambelli”
- Università degli Studi di Salerno
- I-84084 Fisciano
- Italy
| | - Carmen Talotta
- Dipartimento di Chimica e Biologia “A. Zambelli”
- Università degli Studi di Salerno
- I-84084 Fisciano
- Italy
| | - Giuseppe Floresta
- Dipartimento di Scienze del Farmaco
- Università di Catania
- 95125 Catania
- Italy
| | - Antonio Rescifina
- Dipartimento di Scienze del Farmaco
- Università di Catania
- 95125 Catania
- Italy
| | - Carmine Gaeta
- Dipartimento di Chimica e Biologia “A. Zambelli”
- Università degli Studi di Salerno
- I-84084 Fisciano
- Italy
| | - Placido Neri
- Dipartimento di Chimica e Biologia “A. Zambelli”
- Università degli Studi di Salerno
- I-84084 Fisciano
- Italy
| |
Collapse
|
173
|
Peng BJ, Huang YT, Fülöp F, Lin IL, Yang SC. Palladium-catalyzed selective N-allylation of indoles assisted by PEG–water system. NEW J CHEM 2019. [DOI: 10.1039/c9nj02335f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of N-allylic indoles is of great interest because of their potential biological properties.
Collapse
Affiliation(s)
- Bai-Jing Peng
- School of Pharmacy
- College of Pharmacy
- Kaohsiung Medical University
- Kaohsiung 807
- Taiwan
| | - Yi-Ting Huang
- School of Pharmacy
- College of Pharmacy
- Kaohsiung Medical University
- Kaohsiung 807
- Taiwan
| | - Ferenc Fülöp
- Institute of Pharmaceutical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
| | - I-Ling Lin
- Department of Medical Laboratory Science and Biotechnology
- College of Health Sciences
- Kaohsiung Medical University
- Kaohsiung 807
- Taiwan
| | - Shyh-Chyun Yang
- School of Pharmacy
- College of Pharmacy
- Kaohsiung Medical University
- Kaohsiung 807
- Taiwan
| |
Collapse
|
174
|
Heravi MM, Zadsirjan V, Masoumi B, Heydari M. Organometal-catalyzed asymmetric Friedel-Crafts reactions. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2018.10.011] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
175
|
Jin LW, Jiang F, Chen KW, Du BX, Mei GJ, Shi F. Phosphine-catalyzed regiospecific (3 + 2) cyclization of 3-nitroindoles with allene esters. Org Biomol Chem 2019; 17:3894-3901. [DOI: 10.1039/c9ob00432g] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The title reaction has been established to construct indole-fused five-membered rings in good yields (up to 86%).
Collapse
Affiliation(s)
- Li-Wen Jin
- School of Chemistry and Materials Science
- Jiangsu Normal University
- Xuzhou
- China
| | - Fei Jiang
- School of Chemistry and Materials Science
- Jiangsu Normal University
- Xuzhou
- China
| | - Ke-Wei Chen
- School of Chemistry and Materials Science
- Jiangsu Normal University
- Xuzhou
- China
| | - Bai-Xiang Du
- School of Chemistry and Materials Science
- Jiangsu Normal University
- Xuzhou
- China
| | - Guang-Jian Mei
- School of Chemistry and Materials Science
- Jiangsu Normal University
- Xuzhou
- China
| | - Feng Shi
- School of Chemistry and Materials Science
- Jiangsu Normal University
- Xuzhou
- China
| |
Collapse
|
176
|
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.
Collapse
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
| |
Collapse
|
177
|
Vila C, Tortosa A, Blay G, Muñoz MC, Pedro JR. Organocatalytic enantioselective functionalization of indoles in the carbocyclic ring with cyclic imines. NEW J CHEM 2019. [DOI: 10.1039/c8nj05577g] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An organocatalytic enantioselective functionalization in the carbocyclic ring of indoles with benzoxathiazine 2,2-dioxides is described using a quinine-derived bifunctional organocatalyst.
Collapse
Affiliation(s)
- Carlos Vila
- Departament de Química Orgànica
- Facultat de Química
- Universitat de València
- València
- Spain
| | - Arturo Tortosa
- Departament de Química Orgànica
- Facultat de Química
- Universitat de València
- València
- Spain
| | - Gonzalo Blay
- Departament de Química Orgànica
- Facultat de Química
- Universitat de València
- València
- Spain
| | - M. Carmen Muñoz
- Departament de Física Aplicada
- Universitat Politècnica de València
- Camino de Vera s/n
- 46022 València
- Spain
| | - José R. Pedro
- Departament de Química Orgànica
- Facultat de Química
- Universitat de València
- València
- Spain
| |
Collapse
|
178
|
Xu K, Chen W, Lin J, Chen G, Wang B, Tian X. Facile synthesis of 9H-pyrrolo[1,2-a]indoles via Brønsted acid catalyzed cascade reactions. Chem Commun (Camb) 2019; 55:14613-14616. [PMID: 31742577 DOI: 10.1039/c9cc07228d] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A Brønsted acid system promotes the Friedel–Crafts alkenylation/1,6-addition/condensation cascade reaction of ynones with indoles to access 9H-pyrrolo[1,2-a]indoles.
Collapse
Affiliation(s)
- Kunhua Xu
- Key Laboratory of Molecular Target & Clinical Pharmacology and the State Key Laboratory of Respiratory Disease
- School of Pharmaceutical Sciences & the Fifth Affiliated Hospital
- Guangzhou Medical University
- Guangzhou
- P. R. China
| | - Wenming Chen
- Department of Pharmaceutical Production Center
- The First Affiliated Hospital of Hunan University of Chinese Medicine
- Changsha
- P. R. China
| | - Jin Lin
- Key Laboratory of Molecular Target & Clinical Pharmacology and the State Key Laboratory of Respiratory Disease
- School of Pharmaceutical Sciences & the Fifth Affiliated Hospital
- Guangzhou Medical University
- Guangzhou
- P. R. China
| | - Guifang Chen
- Key Laboratory of Molecular Target & Clinical Pharmacology and the State Key Laboratory of Respiratory Disease
- School of Pharmaceutical Sciences & the Fifth Affiliated Hospital
- Guangzhou Medical University
- Guangzhou
- P. R. China
| | - Biao Wang
- Key Laboratory of Molecular Target & Clinical Pharmacology and the State Key Laboratory of Respiratory Disease
- School of Pharmaceutical Sciences & the Fifth Affiliated Hospital
- Guangzhou Medical University
- Guangzhou
- P. R. China
| | - Xu Tian
- Key Laboratory of Molecular Target & Clinical Pharmacology and the State Key Laboratory of Respiratory Disease
- School of Pharmaceutical Sciences & the Fifth Affiliated Hospital
- Guangzhou Medical University
- Guangzhou
- P. R. China
| |
Collapse
|
179
|
Zhang H, Li S, Kang Q, Du Y. Chiral-at-metal rhodium(iii) complex catalyzed enantioselective synthesis of C2-substituted benzofuran derivatives. Org Chem Front 2019. [DOI: 10.1039/c9qo01022j] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
An enantioselective C2-nucleophilic functionalization of 3-aminobenzofurans has been realized under catalysis of chiral rhodium(iii) complexes, affording a large array of C2-substituted benzofuran derivatives in high yields and enantioselectivities.
Collapse
Affiliation(s)
- Haoran Zhang
- Key Laboratory of Coal to Ethylene Glycol and Its Related Technology
- Center for Excellence in Molecular Synthesis
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
| | - Shiwu Li
- Key Laboratory of Coal to Ethylene Glycol and Its Related Technology
- Center for Excellence in Molecular Synthesis
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
| | - Qiang Kang
- Key Laboratory of Coal to Ethylene Glycol and Its Related Technology
- Center for Excellence in Molecular Synthesis
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
| | - Yu Du
- Key Laboratory of Coal to Ethylene Glycol and Its Related Technology
- Center for Excellence in Molecular Synthesis
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
| |
Collapse
|
180
|
Lin JS, Li TT, Liu JR, Jiao GY, Gu QS, Cheng JT, Guo YL, Hong X, Liu XY. Cu/Chiral Phosphoric Acid-Catalyzed Asymmetric Three-Component Radical-Initiated 1,2-Dicarbofunctionalization of Alkenes. J Am Chem Soc 2018; 141:1074-1083. [DOI: 10.1021/jacs.8b11736] [Citation(s) in RCA: 118] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Jin-Shun Lin
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055, China
| | - Tao-Tao Li
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055, China
| | - Ji-Ren Liu
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Guan-Yuan Jiao
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055, China
| | - Qiang-Shuai Gu
- SUSTech Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518055, China
| | - Jiang-Tao Cheng
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055, China
| | - Yu-Long Guo
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055, China
| | - Xin Hong
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Xin-Yuan Liu
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055, China
| |
Collapse
|
181
|
Wang C, Li N, Zhu WJ, Gong JF, Song MP. Asymmetric Michael Addition of 2-Acetyl Azaarenes to β-CF3-β-(3-indolyl)nitroalkenes Catalyzed by a Cobalt(II)/(imidazoline-oxazoline) Complex. J Org Chem 2018; 84:191-203. [DOI: 10.1021/acs.joc.8b02601] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Cong Wang
- College of Chemistry and Molecular Engineering, Henan Key Laboratory of Chemical Biology and Organic Chemistry, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Nan Li
- College of Chemistry and Molecular Engineering, Henan Key Laboratory of Chemical Biology and Organic Chemistry, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Wen-Jing Zhu
- College of Chemistry and Molecular Engineering, Henan Key Laboratory of Chemical Biology and Organic Chemistry, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Jun-Fang Gong
- College of Chemistry and Molecular Engineering, Henan Key Laboratory of Chemical Biology and Organic Chemistry, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Mao-Ping Song
- College of Chemistry and Molecular Engineering, Henan Key Laboratory of Chemical Biology and Organic Chemistry, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| |
Collapse
|
182
|
Xiao BX, Gao XY, Du W, Chen YC. Asymmetric Reactions involving Lewis Base Catalyst Tethered Dearomatized Intermediates. Chemistry 2018; 25:1607-1613. [PMID: 30109896 DOI: 10.1002/chem.201803592] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Indexed: 01/01/2023]
Affiliation(s)
- Ben-Xian Xiao
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Xin-Yue Gao
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Wei Du
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Ying-Chun Chen
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
- College of Pharmacy; Third Military Medical University; Chongqing 400038 China
| |
Collapse
|
183
|
Liu YL, Lin XT. Recent Advances in Catalytic Asymmetric Synthesis of Tertiary Alcohols via
Nucleophilic Addition to Ketones. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201801023] [Citation(s) in RCA: 106] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Yun-Lin Liu
- School of Chemistry and Chemical Engineering; Guangzhou University; Guangzhou 510006 People's Republic of China
| | - Xiao-Tong Lin
- School of Chemistry and Chemical Engineering; Guangzhou University; Guangzhou 510006 People's Republic of China
| |
Collapse
|
184
|
Ghosh T, Ghosh R, Ghosh P. Mechanistic Insight into Fast and Highly Efficient Organocatalytic Activity of a Tripodal Dimeric Hexaurea Capsular Assembly in Michael Addition Reactions. ACS OMEGA 2018; 3:10647-10656. [PMID: 31459185 PMCID: PMC6645588 DOI: 10.1021/acsomega.8b01780] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Accepted: 08/23/2018] [Indexed: 06/10/2023]
Abstract
A tris(2-aminoethyl)-amine-based dimeric capsular assembly of pentafluorophenyl urea (C1) has been employed as a catalyst in a wide range of Michael addition reactions. This capsular catalyst assembly dramatically accelerates the Michael addition reaction of β-nitrostyrenes (2a-2d) with various Michael donors such as ketoesters (3a, 3e), 1,3-diketones (3b), diesters (3C), and cyanoesters (3d) at room temperature to yield the corresponding nitroalkanes in significantly high yields within a very short reaction time. Significant improvement in solubility and use of conventional organic solvents in reaction along with a drastic decrease in reaction time (high value of the rate constant of the reaction) has been achieved through C1 as compared to the previously reported homologous tripodal monomeric urea catalyst (L1). The addition of enolate to β-nitrostyrenes to generate an anionic intermediate seemed to be highly stabilized by the six urea units of capsular assembly. Control experiments and in situ kinetic studies are performed for this addition reaction and based on the results, a plausible mechanism has been proposed for the formation of Michael adduct inside the capsular cavity.
Collapse
Affiliation(s)
- Tamal
Kanti Ghosh
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Kolkata 700032, India
| | - Rajib Ghosh
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Kolkata 700032, India
| | - Pradyut Ghosh
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Kolkata 700032, India
| |
Collapse
|
185
|
Naresh Babu K, Kariyandi NR, Saheeda M. K. S, Kinthada LK, Bisai A. Lewis Acid-Catalyzed Malonate Addition onto 3-Hydroxy-2-oxindoles: Mechanistic Consideration and Synthetic Approaches to the Pyrroloindoline Alkaloids. J Org Chem 2018; 83:12664-12682. [DOI: 10.1021/acs.joc.8b02017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- K. Naresh Babu
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal, Madhya Pradesh 462 066, India
| | - Nikhil Raj Kariyandi
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal, Madhya Pradesh 462 066, India
| | - Saina Saheeda M. K.
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal, Madhya Pradesh 462 066, India
| | - Lakshmana K. Kinthada
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal, Madhya Pradesh 462 066, India
| | - Alakesh Bisai
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal, Madhya Pradesh 462 066, India
| |
Collapse
|
186
|
Yonesaki R, Kondo Y, Akkad W, Sawa M, Morisaki K, Morimoto H, Ohshima T. 3-Mono-Substituted BINOL Phosphoric Acids as Effective Organocatalysts in Direct Enantioselective Friedel-Crafts-Type Alkylation of N-Unprotected α-Ketiminoester. Chemistry 2018; 24:15211-15214. [PMID: 30098059 DOI: 10.1002/chem.201804078] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Indexed: 11/08/2022]
Abstract
Although BINOL-derived phosphoric acids are among the most widely used chiral Brønsted acid organocatalysts, their structures are mostly limited to 3,3'-disubstituted ones and simple 3-mono-substituted ones without any polar functionalities on the 3-substituent have not been used in highly enantioselective reactions. This work reports such 3-mono-substituted analogues as effective organocatalysts in direct highly enantioselective Friedel-Crafts-type alkylation of N-unprotected α-ketiminoester. The origin of the observed high enantioselectivity with the 3-mono-substituted catalyst is also discussed.
Collapse
Affiliation(s)
- Ryohei Yonesaki
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Yuta Kondo
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Walaa Akkad
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Masanao Sawa
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Kazuhiro Morisaki
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Hiroyuki Morimoto
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Takashi Ohshima
- Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| |
Collapse
|
187
|
Wang K, Chen C, Liu X, Li D, Peng T, Liu X, Yang D, Wang L. Enantioselective Reaction between 2-(Cyanomethyl)azaarenes and N-Boc-amino Sulfones. Org Lett 2018; 20:5260-5263. [PMID: 30095273 DOI: 10.1021/acs.orglett.8b02205] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of 2-(cyanomethyl)azaarenes containing benzothiazole or benzoxazole were designed and synthesized for asymmetric α-functionalization with N-Boc-amino sulfones. The Mannich adducts were obtained in high yields with good diastereo- and enantioselectivities. Aryl-substituted amino sulfones were tolerated under the current conditions, and the reaction can be performed on gram scale in good results.
Collapse
Affiliation(s)
- Kezhou Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences , Lanzhou University Lanzhou 730000 , China.,The College of Ecological Environment and Resources , Qinghai Nationalities University , Xining 810007 , China
| | - Chao Chen
- Guangdong Provincial Key Laboratory of Nano-Micro Materials Research, School of Chemical Biology & Biotechnology , Peking University Shenzhen Graduate School , Shenzhen 518055 , China
| | - Xihong Liu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences , Lanzhou University Lanzhou 730000 , China
| | - Dan Li
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences , Lanzhou University Lanzhou 730000 , China
| | - Tianyu Peng
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences , Lanzhou University Lanzhou 730000 , China
| | - Xin Liu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences , Lanzhou University Lanzhou 730000 , China
| | - Dongxu Yang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences , Lanzhou University Lanzhou 730000 , China
| | - Linqing Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences , Lanzhou University Lanzhou 730000 , China
| |
Collapse
|
188
|
Abstract
Fulfilling the direct inert C–H bond functionalization of raw materials that are earth-abundant and commercially available for the synthesis of diverse targeted organic compounds is very desirable and its implementation would mean a great reduction of the synthetic steps required for substrate prefunctionalization such as halogenation, borylation, and metalation. Successful C–H bond functionalization mainly resorts to homogeneous transition-metal catalysis, albeit sometimes suffering from poor catalyst reusability, nontrivial separation, and severe biotoxicity. TiO2 photocatalysis displays multifaceted advantages, such as strong oxidizing ability, high chemical stability and photostability, excellent reusability, and low biotoxicity. The chemical reactions started and delivered by TiO2 photocatalysts are well known to be widely used in photocatalytic water-splitting, organic pollutant degradation, and dye-sensitized solar cells. Recently, TiO2 photocatalysis has been demonstrated to possess the unanticipated ability to trigger the transformation of inert C–H bonds for C–C, C–N, C–O, and C–X bond formation under ultraviolet light, sunlight, and even visible-light irradiation at room temperature. A few important organic products, traditionally synthesized in harsh reaction conditions and with specially functionalized group substrates, are continuously reported to be realized by TiO2 photocatalysis with simple starting materials under very mild conditions. This prominent advantage—the capability of utilizing cheap and readily available compounds for highly selective synthesis without prefunctionalized reactants such as organic halides, boronates, silanes, etc.—is attributed to the overwhelmingly powerful photo-induced hole reactivity of TiO2 photocatalysis, which does not require an elevated reaction temperature as in conventional transition-metal catalysis. Such a reaction mechanism, under typically mild conditions, is apparently different from traditional transition-metal catalysis and beyond our insights into the driving forces that transform the C–H bond for C–C bond coupling reactions. This review gives a summary of the recent progress of TiO2 photocatalytic C–H bond activation for C–C coupling reactions and discusses some model examples, especially under visible-light irradiation.
Collapse
|
189
|
Schlegel M, Coburger P, Schneider C. A Novel Sc(OTf) 3 -Catalyzed (2+2+1)-Cycloannulation/Aza-Friedel-Crafts Alkylation Sequence toward Multicyclic 2-Pyrrolines. Chemistry 2018; 24:14207-14212. [PMID: 29939442 DOI: 10.1002/chem.201802478] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Indexed: 12/13/2022]
Abstract
The rapid assembly of molecular complexity continues to be at the forefront of novel reaction development. In the pursuit of that goal, we herein report a novel Sc(OTf)3 -catalyzed, one-pot multicomponent reaction that furnishes complex multicyclic 2-pyrrolines with excellent overall yields and perfect diastereocontrol. This process is based on our previously established (2+2+1)-cycloannulation of in situ generated 1-azaallyl cations, 1,3-dicarbonyls and primary amines. The newly formed and highly reactive aminal moiety is readily substituted with indoles and pyrroles both as external and internal π-nucleophiles to provide densely functionalized N-heterocycles with four new σ-bonds and two vicinal quaternary stereogenic centers. In addition, DFT calculations have been conducted to further characterize the intermediate 1-azaallyl cations.
Collapse
Affiliation(s)
- Marcel Schlegel
- Institut für Organische Chemie, Universität Leipzig, Johannisallee 29, 04103, Leipzig, Germany
| | - Peter Coburger
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103, Leipzig, Germany
| | - Christoph Schneider
- Institut für Organische Chemie, Universität Leipzig, Johannisallee 29, 04103, Leipzig, Germany
| |
Collapse
|
190
|
Gao Z, Zhang J, Yang H, Jiang G. Brønsted Acid-Promoted Friedel-Crafts Alkylation/Cyclization of (7-Hydroxynaphthalenyl)pyrrole or (2-Hydroxyphenyl)pyrroles with Isatins for the Construction of Pyrrolospirooxindole Derivatives. J Org Chem 2018; 83:11407-11414. [PMID: 30028135 DOI: 10.1021/acs.joc.8b01703] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
An efficient trifluoroacetic acid-catalyzed cascade Friedel-Crafts alkylation/cyclization of 1-(7-hydroxynaphthalenyl)pyrrole or 1-(2-hydroxyphenyl)pyrroles with isatins has been developed, providing practical access to a variety of biologically important pyrrole-containing spirooxindoles.
Collapse
Affiliation(s)
- Zeng Gao
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute of LICP , Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences , Lanzhou 730000 , China.,University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Jinlong Zhang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute of LICP , Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences , Lanzhou 730000 , China
| | - Huameng Yang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute of LICP , Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences , Lanzhou 730000 , China
| | - Gaoxi Jiang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute of LICP , Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences , Lanzhou 730000 , China
| |
Collapse
|
191
|
Theoretical insight into phosphoric acid-catalyzed asymmetric conjugate addition of indolizines to α,β-unsaturated ketones. CHINESE CHEM LETT 2018. [DOI: 10.1016/j.cclet.2018.03.018] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
192
|
Urea Activation by an External Brønsted Acid: Breaking Self-Association and Tuning Catalytic Performance. Catalysts 2018. [DOI: 10.3390/catal8080305] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
In this work, we hypothesize that Brønsted acids can activate urea-based catalysts by diminishing its self-assembly tendency. As a proof of concept, we used the asymmetric Friedel–Crafts alkylation of indoles with nitroalkenes as a benchmark reaction. The resulting 3-substituted indole derivatives were obtained with better results due to cooperative effects of the chiral urea and a Brønsted acid additive. Such synergy has been rationalized in terms of disassembly of the supramolecular catalyst aggregates, affording a more acidic and rigid catalytic complex.
Collapse
|
193
|
Zhai RL, Xue YS, Liang T, Mi JJ, Xu Z. Regioselective Arene and Heteroarene Functionalization: N-Alkenoxypyridinium Salts as Electrophilic Alkylating Agents for the Synthesis of α-Aryl/α-Heteroaryl Ketones. J Org Chem 2018; 83:10051-10059. [DOI: 10.1021/acs.joc.8b01388] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rong L. Zhai
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, Tongshan Road 209, Xuzhou, 221004, People’s Republic of China
| | - Yun S. Xue
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, Tongshan Road 209, Xuzhou, 221004, People’s Republic of China
| | - Ting Liang
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, Tongshan Road 209, Xuzhou, 221004, People’s Republic of China
| | - Jia J. Mi
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, Tongshan Road 209, Xuzhou, 221004, People’s Republic of China
| | - Zhou Xu
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, Tongshan Road 209, Xuzhou, 221004, People’s Republic of China
| |
Collapse
|
194
|
An Organocatalytic Asymmetric Synthesis of Chiral β,β-Diaryl-α-amino Acids via Addition of Azlactones to In Situ Generated para
-Quinone Methides. Chem Asian J 2018; 13:2440-2444. [DOI: 10.1002/asia.201800569] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2018] [Revised: 05/23/2018] [Indexed: 12/11/2022]
|
195
|
Metal and acid-free visible light-mediated Friedel-Crafts alkylation reactions of indole with anilines. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.06.046] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
|
196
|
Favaretto L, An J, Sambo M, De Nisi A, Bettini C, Melucci M, Kovtun A, Liscio A, Palermo V, Bottoni A, Zerbetto F, Calvaresi M, Bandini M. Graphene Oxide Promotes Site-Selective Allylic Alkylation of Thiophenes with Alcohols. Org Lett 2018; 20:3705-3709. [PMID: 29863889 DOI: 10.1021/acs.orglett.8b01531] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The graphene oxide (GO) assisted allylic alkylation of thiophenes with alcohols is presented. Mild reaction conditions and a low GO loading enabled the isolation of a range of densely functionalized thienyl and bithienyl compounds in moderate to high yields (up to 90%). The cooperative action of the Brønsted acidity, epoxide moieties, and π-surface of the 2D-promoter is highlighted as crucial in the reaction course of the present Friedel-Crafts-type protocol.
Collapse
Affiliation(s)
- Laura Favaretto
- Istituto per la Sintesi Organica e Fotoreattività (ISOF) - CNR , via Gobetti 101 , 40129 Bologna , Italy
| | - Juzeng An
- Dipartimento di Chimica "G. Ciamician" , Alma Mater Studiorum - Università di Bologna , via Selmi 2 , 40126 Bologna , Italy
| | - Marco Sambo
- Dipartimento di Chimica "G. Ciamician" , Alma Mater Studiorum - Università di Bologna , via Selmi 2 , 40126 Bologna , Italy
| | - Assunta De Nisi
- Dipartimento di Chimica "G. Ciamician" , Alma Mater Studiorum - Università di Bologna , via Selmi 2 , 40126 Bologna , Italy
| | - Cristian Bettini
- Istituto per la Sintesi Organica e Fotoreattività (ISOF) - CNR , via Gobetti 101 , 40129 Bologna , Italy
| | - Manuela Melucci
- Istituto per la Sintesi Organica e Fotoreattività (ISOF) - CNR , via Gobetti 101 , 40129 Bologna , Italy
| | - Alessandro Kovtun
- Istituto per la Sintesi Organica e Fotoreattività (ISOF) - CNR , via Gobetti 101 , 40129 Bologna , Italy
| | - Andrea Liscio
- Istituto per la Sintesi Organica e Fotoreattività (ISOF) - CNR , via Gobetti 101 , 40129 Bologna , Italy
- Istituto per la Microelettronica e Microsistemi (IMM) - CNR , via del Fosso del Cavaliere 100 , 00133 Rome , Italy
| | - Vincenzo Palermo
- Istituto per la Sintesi Organica e Fotoreattività (ISOF) - CNR , via Gobetti 101 , 40129 Bologna , Italy
| | - Andrea Bottoni
- Dipartimento di Chimica "G. Ciamician" , Alma Mater Studiorum - Università di Bologna , via Selmi 2 , 40126 Bologna , Italy
| | - Francesco Zerbetto
- Dipartimento di Chimica "G. Ciamician" , Alma Mater Studiorum - Università di Bologna , via Selmi 2 , 40126 Bologna , Italy
| | - Matteo Calvaresi
- Dipartimento di Chimica "G. Ciamician" , Alma Mater Studiorum - Università di Bologna , via Selmi 2 , 40126 Bologna , Italy
| | - Marco Bandini
- Dipartimento di Chimica "G. Ciamician" , Alma Mater Studiorum - Università di Bologna , via Selmi 2 , 40126 Bologna , Italy
| |
Collapse
|
197
|
Pellissier H. Synthesis of chiral 3-substituted 3-amino-2-oxindoles through enantioselective catalytic nucleophilic additions to isatin imines. Beilstein J Org Chem 2018; 14:1349-1369. [PMID: 29977400 PMCID: PMC6009130 DOI: 10.3762/bjoc.14.114] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 05/17/2018] [Indexed: 12/14/2022] Open
Abstract
This review collects the recent developments in the synthesis of chiral 3-substituted 3-amino-2-oxindoles based on enantioselective catalytic nucleophilic additions to isatin imines published since the beginning of 2015.
Collapse
Affiliation(s)
- Hélène Pellissier
- Aix-Marseille Univ, CNRS, Centrale Marseille, iSm2, Marseille, France
| |
Collapse
|
198
|
Gour J, Gatadi S, Nagarsenkar A, Babu BN, Madhavi YV, Nanduri S. Synthesis of Indolo[1,2-b
]isoquinoline Derivatives by Lewis Acid-Catalyzed Intramolecular Friedel-Crafts Alkylation Reaction. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800162] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Jitendra Gour
- National Institute of Pharmaceutical Education and Research (NIPER); 500 037 Hyderabad India
| | - Srikanth Gatadi
- National Institute of Pharmaceutical Education and Research (NIPER); 500 037 Hyderabad India
| | - Atulya Nagarsenkar
- National Institute of Pharmaceutical Education and Research (NIPER); 500 037 Hyderabad India
| | - Bathini Nagendra Babu
- National Institute of Pharmaceutical Education and Research (NIPER); 500 037 Hyderabad India
| | - Y. V. Madhavi
- National Institute of Pharmaceutical Education and Research (NIPER); 500 037 Hyderabad India
| | - Srinivas Nanduri
- National Institute of Pharmaceutical Education and Research (NIPER); 500 037 Hyderabad India
| |
Collapse
|
199
|
Ma J, Kass SR. Asymmetric Arylation of 2,2,2-Trifluoroacetophenones Catalyzed by Chiral Electrostatically-Enhanced Phosphoric Acids. Org Lett 2018; 20:2689-2692. [PMID: 29696976 DOI: 10.1021/acs.orglett.8b00900] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
A series of highly reactive metal-free chiral phosphoric acids possessing positively charged phosphonium ion substituents are reported and have been applied to Friedel-Crafts alkylations of indoles and 2,2,2-trifluoromethyl aryl ketones. These catalysts are orders-of-magnitude more active and have similar or better enantioselectivities than their noncharged analogues. High tolerance to a range of substrates with electron-withdrawing and electron-donating substituents was also observed.
Collapse
Affiliation(s)
- Jie Ma
- Department of Chemistry , University of Minnesota , 207 Pleasant Street SE , Minneapolis , Minnesota 55455 , United States
| | - Steven R Kass
- Department of Chemistry , University of Minnesota , 207 Pleasant Street SE , Minneapolis , Minnesota 55455 , United States
| |
Collapse
|
200
|
Yarlagadda S, Sridhar B, Subba Reddy BV. Oxidative Asymmetric Aza-Friedel-Crafts Alkylation of Indoles with 3-Indolinone-2-carboxylates Catalyzed by a BINOL Phosphoric Acid and Promoted by DDQ. Chem Asian J 2018; 13:1327-1334. [PMID: 29575703 DOI: 10.1002/asia.201800300] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2018] [Indexed: 12/11/2022]
Abstract
An asymmetric aza-Friedel-Crafts alkylation reaction between indoles and indolenines that were derived in situ from 3-indolinone-2-carboxylates has been developed by using 3,3'-bis(triphenylsilyl)-1,1'-binaphthyl-2,2'-diyl hydrogen phosphate as a catalyst. The reaction proceeded under mild conditions and provided chiral indol-3-yl-3-indolinone-2-carboxylate derivatives in good yields with excellent ee values (up to 98.6 %). Similarly, the Mannich-type addition of indoline-3-ones to indolenines provided heterodimers with vicinal chiral quaternary centers. This method was successfully applied to the construction of the core structure of trigonoliimine C.
Collapse
Affiliation(s)
- Suresh Yarlagadda
- Centre for Semiochemicals, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India
| | - B Sridhar
- Laboratory of X-ray Crystallography, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India
| | | |
Collapse
|