1
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Chen Y, Cha TL, Jiang J, Li Y, Xie XY, Li D, Yan CX, Shao LD. Divergent Total Syntheses of Lycorine Alkaloids via a Sequential C-H Functionalization Strategy. J Org Chem 2024; 89:4851-4860. [PMID: 38546258 DOI: 10.1021/acs.joc.4c00054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Abstract
A Pd-catalyzed one-pot sequential C-H functionalization strategy was utilized to prepare four lycorine alkaloids and one pseudo-lycorine alkaloid from the common intermediate 4. By switching the followed oxidative conditions of air, DMSO/H2O/I2, and DMSO/O2, based on the Pd(PPh3)4/K2CO3/toluene catalytic system, three key intermediates 12a, 12b, and 12c with different substitution patterns could be obtained in a well-controlled manner. As a result, four natural products γ-lycorane, hippadine, anhydrolycorinone, and anhydrolycorine as well as a pseudo-lycorine alkaloid Δ(4a,10b)-6-oxodihydrolycorine were successfully synthesized within 10 steps through this divergent route.
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Affiliation(s)
- Yang Chen
- Yunnan Key Laboratory of Southern Medicinal Utilization, School of Chinese Materia Medica, Yunnan University of Chinese Medicine, Kunming 650500, China
| | - Tong-Ling Cha
- Yunnan Key Laboratory of Southern Medicinal Utilization, School of Chinese Materia Medica, Yunnan University of Chinese Medicine, Kunming 650500, China
| | - Jing Jiang
- Yunnan Precious Metals Laboratory, Kunming Institute of Precious Metals, Kunming 650106, China
| | - Yong Li
- Yunnan Key Laboratory of Southern Medicinal Utilization, School of Chinese Materia Medica, Yunnan University of Chinese Medicine, Kunming 650500, China
| | - Xiao-Yan Xie
- Yunnan Key Laboratory of Southern Medicinal Utilization, School of Chinese Materia Medica, Yunnan University of Chinese Medicine, Kunming 650500, China
| | - Dashan Li
- Yunnan Key Laboratory of Southern Medicinal Utilization, School of Chinese Materia Medica, Yunnan University of Chinese Medicine, Kunming 650500, China
| | - Cai-Xian Yan
- Yunnan Precious Metals Laboratory, Kunming Institute of Precious Metals, Kunming 650106, China
| | - Li-Dong Shao
- Yunnan Key Laboratory of Southern Medicinal Utilization, School of Chinese Materia Medica, Yunnan University of Chinese Medicine, Kunming 650500, China
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2
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Kudashev A, Vergura S, Zuccarello M, Bürgi T, Baudoin O. Methylene C(sp 3 )-H Arylation Enables the Stereoselective Synthesis and Structure Revision of Indidene Natural Products. Angew Chem Int Ed Engl 2024; 63:e202316103. [PMID: 37997293 DOI: 10.1002/anie.202316103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 11/20/2023] [Accepted: 11/23/2023] [Indexed: 11/25/2023]
Abstract
The divergent synthesis of two indane polyketides of the indidene family, namely (±)-indidene A (11 steps, 1.7 %) and (+)-indidene C (13 steps, 1.3 %), is reported. The synthesis of the trans-configured common indane intermediate was enabled by palladium(0)-catalyzed methylene C(sp3 )-H arylation, which was performed in both racemic and enantioselective (e.r. 99 : 1) modes. Further elaboration of this common intermediate by nickel-catalyzed dehydrogenative coupling allowed the rapid installation of the aroyl moiety of (±)-indidene A. In parallel, the biphenyl system of (±)- and (+)-indidene C was constructed by Suzuki-Miyaura coupling. These investigations led us to revise the structures of indidenes B and C.
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Affiliation(s)
- Anton Kudashev
- University of Basel, Department of Chemistry, St. Johanns-Ring 19, 4056, Basel, Switzerland
| | - Stefania Vergura
- University of Basel, Department of Chemistry, St. Johanns-Ring 19, 4056, Basel, Switzerland
| | - Marco Zuccarello
- University of Basel, Department of Chemistry, St. Johanns-Ring 19, 4056, Basel, Switzerland
| | - Thomas Bürgi
- University of Geneva, Department of Physical Chemistry, 30 Quai Ernest-Ansermet, 1211, Geneva 4, Switzerland
| | - Olivier Baudoin
- University of Basel, Department of Chemistry, St. Johanns-Ring 19, 4056, Basel, Switzerland
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3
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Sinha SK, Ghosh P, Jain S, Maiti S, Al-Thabati SA, Alshehri AA, Mokhtar M, Maiti D. Transition-metal catalyzed C-H activation as a means of synthesizing complex natural products. Chem Soc Rev 2023; 52:7461-7503. [PMID: 37811747 DOI: 10.1039/d3cs00282a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/10/2023]
Abstract
Over the past few decades, the advent of C-H activation has led to a rethink among chemists about the synthetic strategies employed for multi-step transformations. Indeed, deploying innovative and masterful tricks against the numerous classical organic transformations has been the need of the hour. Despite this, the immense importance of C-H activation remains unfulfilled unless the methodology can be deployed for large-scale industrial processes and towards the concise, step-economic synthesis of prodigious natural products and pharmaceutical drugs. Lately, the growing potential of C-H activation methodology has indeed driven the pioneers of synthetic organic chemists into finding more efficient methods to accelerate the synthesis of such complex molecular scaffolds. This review aims to draw a general overview of the various C-H activation procedures that have been adopted for synthesizing these vast majority of structurally complicated natural products. Our objective lies in drawing a complete picture and taking the readers through the synthesis of a series of such complex organic compounds by simplified techniques, making it step-economic on a larger scale and thus instigating the readers to trigger the use of such methodology and uncover new, unique patterns for future synthesis of such natural products.
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Affiliation(s)
- Soumya Kumar Sinha
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
| | - Pintu Ghosh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
| | - Shubhanshu Jain
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
| | - Siddhartha Maiti
- School of Biosciences, Engineering and Technology, VIT Bhopal University, Kothrikalan, Sehore, Madhya Pradesh - 466114, India
| | - Shaeel A Al-Thabati
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia
| | - Abdulmohsen Ali Alshehri
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia
| | - Mohamed Mokhtar
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia
| | - Debabrata Maiti
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
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4
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Bautista DD, Reyes MAV, González EAB, Bugarin A. Synthetic Approaches to α-, β-, γ-, and δ-lycoranes. European J Org Chem 2023; 26:e202300404. [PMID: 37927304 PMCID: PMC10624333 DOI: 10.1002/ejoc.202300404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Indexed: 11/07/2023]
Abstract
Lycorane is a pentacyclic core presented in alkaloids isolated from the Amaryllidaceae family of herbaceous flowering plants. Members of this class of natural products have shown to display important biological properties including analgesic, antiviral, and antiproliferative activities. This review presents the known synthetic routes toward α-, β-, γ-, and δ-lycoranes. α-(19 routes), β-(10 routes), γ-(38 routes), and δ-(6 routes).
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Affiliation(s)
- Diego Díaz Bautista
- Universidad Juárez Autónoma de Tabasco, Division Académica de Ciencias Básicas, carretera Cunduacán-Jalpa Km. 0.5, Cunduacán Tabasco 86690, México
| | - Miguel A Vilchis Reyes
- Universidad Juárez Autónoma de Tabasco, Division Académica de Ciencias Básicas, carretera Cunduacán-Jalpa Km. 0.5, Cunduacán Tabasco 86690, México
| | - Ever A Blé González
- Universidad Juárez Autónoma de Tabasco, Division Académica de Ciencias Básicas, carretera Cunduacán-Jalpa Km. 0.5, Cunduacán Tabasco 86690, México
- Department of Chemistry and Physics, Florida Gulf Coast University, 10501 FGCU Boulevard South, Fort Myers, FL, 33965
| | - Alejandro Bugarin
- Department of Chemistry and Physics, Florida Gulf Coast University, 10501 FGCU Boulevard South, Fort Myers, FL, 33965
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5
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Iwasaki H, Ikemoto M, Shibata H, Shima Y, Himeno E, Kojima N, Yamashita M, Nambu H. Regioselective SmI 2-Mediated Radical ipso-Substitution Cyclization for the Construction of Pyrrolophenanthridinone Skeletons: The Synthesis of Amaryllidaceae Alkaloids. Chem Pharm Bull (Tokyo) 2023; 71:515-519. [PMID: 37394600 DOI: 10.1248/cpb.c23-00273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
Here, we report a regioselective, samarium(II) diiodide mediated intramolecular radical ipso-substitution cyclization. Through the use of a methoxy group as a leaving group, it was possible to regulate the regioselectivity of the reaction by changing the temperature and additives. We applied the developed reaction to the synthesis of four Amaryllidaceae alkaloids and have shown that the present reaction successfully overcomes regioselectivity issues encountered with other cyclization methods.
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6
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Xiao J, Zhou GH, Zhou AX, Ji CB. Progress towards the Total Syntheses of Amaryllidaceae Alkaloids γ-Lycorane. Chem Biodivers 2022; 19:e202200410. [PMID: 35833868 DOI: 10.1002/cbdv.202200410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 07/14/2022] [Indexed: 11/06/2022]
Abstract
γ-Lycorane, a degradation product of the Aromaticaceae alkaloid lycorine, is one of the most attractive molecules in the Aromaticaceae family. It remains a popular target for synthesis due to its pentacyclic structure, which presents a vehicle for demonstrating the utility of new synthetic strategies. Various synthetic methods have been developed by synthetic chemists since the first synthesis of γ-lycorane by Nasuo in 1966. Thus, this review presents an overview of the literature on the ways utilized within the synthesis of γ-lycorane in racemic and enantiopure forms via electrophilic arylation, Pd-catalyzed C-C coupling, Bischler-Napieralski cyclization, Pictet-Spengler cyclization, photocyclization, radical cyclization, chiral pool synthesis, chiral auxiliary-mediated synthesis, and catalytic asymmetric synthesis, ranging from 1966 to 2022.
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Affiliation(s)
- Jie Xiao
- Shangrao Normal University, School of Chemistry and Environmental Sciences, No. 401, Zhimin Road, Shangrao city, CHINA
| | - Guang-Hua Zhou
- NanChang Normal University, School of Chemistry and Food Science, No. 889 Ruixiang Road, Nanchang, CHINA
| | - An-Xi Zhou
- Shangrao Normal University, School of Chemistry and Environmental Sciences, No. 401, Zhimin Road, Shangrao city, CHINA
| | - Cong-Bin Ji
- Shangrao Normal University, Chemistry, Zhimin road 401, Shangrao city, Jiangxi province, People's Republic of Chin, 334001, Shangrao, CHINA
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7
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Hall CJJ, Marriott IS, Christensen KE, Day AJ, Goundry WRF, Donohoe TJ. Extension of hydrogen borrowing alkylation reactions for the total synthesis of (-)-γ-lycorane. Chem Commun (Camb) 2022; 58:4966-4968. [PMID: 35348143 DOI: 10.1039/d2cc01248k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The total synthesis of (-)-γ-lycorane (10 steps) and synthesis of (±)-γ-lycorane (8 steps) was completed from cyclohexenone. A new two step hydrogen borrowing alkylation of an aziridinyl alcohol, coupled with a Ph* (Me5C6) deprotection/cyclisation procedure was developed for de novo formation of the fused 6,5 heterocyclic ring. This work is one of the first examples of hydrogen borrowing C-C bond formation being used as a key step in a total synthesis project.
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Affiliation(s)
- Christopher J J Hall
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK.
| | - Indi S Marriott
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK.
| | - Kirsten E Christensen
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK.
| | - Aaron J Day
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK.
| | - William R F Goundry
- Early Chemical Development, Pharmaceutical Sciences, R&D, AstraZeneca, Macclesfield, UK
| | - Timothy J Donohoe
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK.
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8
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Zhang TY, Zhang LY, Liang X, Wei K, Yang YR. Catalytic, Asymmetric Total Synthesis of (+)-α-, (+)-β-, (+)-γ-, and (-)-δ-Lycorane. Org Lett 2022; 24:2905-2909. [PMID: 35412321 DOI: 10.1021/acs.orglett.2c00905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The first collectively asymmetric total synthesis of all members of lycorane, including (+)-α, (+)-β, (+)-γ, and (-)-δ, in a catalytic manner has been achieved. The cornerstone of this synthesis features an asymmetric, stereodivergent Ir/amine dual catalytic α-allylation of 2-phthalimidoacetaldehyde.
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Affiliation(s)
- Tian-Yuan Zhang
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Lu-Yue Zhang
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiao Liang
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Kun Wei
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Yu-Rong Yang
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
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9
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Wilson KB, Nedzbala HS, Simpson SR, Ericson MN, Westendorff KS, Chordia MD, Dickie DA, Harman WD. Hydroamination of Dihapto-Coordinated Benzene and Diene Complexes of Tungsten: Fundamental Studies and the Synthesis of γ-Lycorane. Helv Chim Acta 2022; 104. [PMID: 35125509 DOI: 10.1002/hlca.202100103] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Reactions are described for complexes of the form WTp(NO)(PMe3)(η2-arene) and various amines, where the arene is benzene or benzene with an electron-withdrawing substituent (CF3, SO2Ph, SO2Me). The arene complex is first protonated to form an η2-arenium species, which then selectively adds the amine. The resulting η2-5-amino-1,3-cyclohexadiene complexes can then be subjected to the same sequence with a second nucleophile to form 3-aminocyclohexene complexes, where up to three stereocenters originate from the arene carbons. Alternatively, 1,3-cyclohexadiene complexes containing an ester group at the 5 position (also prepared from an arene) can be treated with acid followed by an amine to form trisubstituted 3-aminocyclohexenes. When the amine is primary, ring closure can occur to form a cis-fused bicyclic γ-lactam. Highly functionalized cyclohexenes can be liberated from the tungsten through oxidative decomplexation. The potential utility of this methodology is demonstrated in the synthesis of the alkaloid γ-lycorane. An enantioenriched synthesis of a lactam precursor to γ-lycorane is also described. This compound is prepared from an enantioenriched version of the tungsten benzene complex. Regio- and stereochemical assignments for the reported compounds are supported by detailed 2D-NMR analysis and 13 molecular structure determinations (SC-XRD).
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Affiliation(s)
- Katy B Wilson
- Department of Chemistry, University of Virginia, Charlottesville, Virginia, 22904, USA
| | - Hannah S Nedzbala
- Department of Chemistry, University of Virginia, Charlottesville, Virginia, 22904, USA
| | - Spenser R Simpson
- Department of Chemistry, University of Virginia, Charlottesville, Virginia, 22904, USA
| | - Megan N Ericson
- Department of Chemistry, University of Virginia, Charlottesville, Virginia, 22904, USA
| | - Karl S Westendorff
- Department of Chemistry, University of Virginia, Charlottesville, Virginia, 22904, USA
| | - Mahendra D Chordia
- Department of Chemistry, University of Virginia, Charlottesville, Virginia, 22904, USA
| | - Diane A Dickie
- Department of Chemistry, University of Virginia, Charlottesville, Virginia, 22904, USA
| | - W Dean Harman
- Department of Chemistry, University of Virginia, Charlottesville, Virginia, 22904, USA
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10
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Sun SY, Raju S, Vedarethinam G, Chen PL, Chuang SC. TfOH-promoted Classical Nazarov-type Cyclization of Benzofulvenes: Synthesis of Polycyclic 5 H,10' H-spiro[benzo[ k]phenanthridine-5,6'-dibenzopentalenes]. Org Lett 2021; 23:6212-6216. [PMID: 34355911 DOI: 10.1021/acs.orglett.1c01809] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The reaction of o-benzofulvene with TfOH leads to intramolecular cyclization through novel C-C and C-N bond formation, resulting in the formation of 5H,10'H-spiro[benzo[k]phenanthridine-5,6'-dibenzopentalene]. This protocol provides a new molecular framework with reasonable to excellent yields and tolerates various electron-withdrawing/donating substituents. This method yields diastereoselectivity of up to >20:1. Furthermore, it is free of bases, oxidants, and metals and proceeds under mild reaction conditions, which are favorable for synthetic organic chemistry.
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Affiliation(s)
- Shang-You Sun
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan 30010, ROC
| | - Selvam Raju
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan 30010, ROC
| | - Guganchandar Vedarethinam
- Department of Applied Chemistry, National Yang Ming Chiao Tung University, Hsinchu, Taiwan 30010, ROC
| | - Pei-Lin Chen
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan 30013, ROC
| | - Shih-Ching Chuang
- Department of Applied Chemistry, National Yang Ming Chiao Tung University, Hsinchu, Taiwan 30010, ROC
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11
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He H, Cao Y, Xu J, Antilla JC. Catalytic Asymmetric C-7 Friedel-Crafts Alkylation/ N-Hemiacetalization of 4-Aminoindoles. Org Lett 2021; 23:3010-3014. [PMID: 33792336 DOI: 10.1021/acs.orglett.1c00699] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A unique catalytic asymmetric C-7 Friedel-Crafts alkylation/N-hemiacetalization cascade reaction of 4-aminoindoles with β,γ-unsaturated α-keto esters has been described. Using a chiral magnesium H8-BINOL-derived bis(phosphate) complex as catalyst, the resulting functionalized 1,7-annulated indole scaffolds are obtained in high yields (up to 98%) and with good to excellent enantioselectivities (up to 99%) and diastereoselectivities (up to >20:1) under mild reaction conditions.
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Affiliation(s)
- Hualing He
- Institute for Molecular Design and Synthesis, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, P.R. China
| | - Yang Cao
- Jiangsu Key Laboratory of Marine Pharmaceutical Compound Screening, Jiangsu Ocean University, Lianyungang 222005, P.R. China
| | - Jun Xu
- Institute for Molecular Design and Synthesis, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, P.R. China
| | - Jon C Antilla
- Institute for Molecular Design and Synthesis, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, P.R. China
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12
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Schiwek CH, Jandl C, Bach T. Diastereoselective Rhodium-Catalyzed Hydrogenation of 2-Oxindoles and 3,4-Dihydroquinolones. Org Lett 2020; 22:9468-9472. [PMID: 33200605 DOI: 10.1021/acs.orglett.0c03427] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The benzene ring of indolin-2-ones (2-oxindoles) and 3,4-dihydroquinol-2-ones was converted to a saturated cyclohexane ring by hydrogenation in the presence of the rhodium complex Cy(CAAC)Rh(cod)Cl. The stereoselectivity of the process was found to be high with respect to both external substituent R1 within the saturated part of the heterocyclic ring and substituent X on the benzene ring. Twenty-one hexahydroindolin-2(3H)-ones (70-99% yield, dr = 83/17 to >99/1) and twelve octahydro-2(1H)-quinolinones (87-96% yield, dr = 64/36 to >99/1) were obtained with the major diastereoisomer exhibiting the hydrogen atoms in an all-cis arrangement. The high tolerance toward functional groups and the compatibility with existing stereogenic centers are key features of the hydrogenation protocol presented here.
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Affiliation(s)
- Christian H Schiwek
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, 85747 Garching, Germany
| | - Christian Jandl
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, 85747 Garching, Germany
| | - Thorsten Bach
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, 85747 Garching, Germany
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13
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Tang RS, Chen LY, Lai CH, Chuang TH. Palladium-Catalyzed Stereoselective Aza-Wacker-Heck Cyclization: One-Pot Stepwise Strategy toward Tetracyclic Fused Heterocycles. Org Lett 2020; 22:9337-9341. [PMID: 33226826 DOI: 10.1021/acs.orglett.0c03552] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Palladium-catalyzed intramolecular tandem cyclization reactions were conducted for the synthesis of densely cis/cis-fused aza-tetracyclic structures. The process involved a palladium(II)-catalyzed aerobic aza-Wacker reaction, followed by a palladium(0)-catalyzed Heck reaction. The effects of the solvent and benzene substitution pattern on the one-pot, two-step cascade reaction were studied systematically, and a probable mechanism was proposed. Strained pentahydrobenzo[f]cyclopenta[hi]indolizin-6-one and racemic γ-lycorane can also be synthesized rapidly using this palladium-catalyzed aza-Wacker-Heck cyclization reaction.
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Affiliation(s)
- Rong-Shiow Tang
- School of Pharmacy, China Medical University, Taichung 406040, Taiwan
| | - Li-Yuan Chen
- School of Pharmacy, China Medical University, Taichung 406040, Taiwan
| | - Chin-Hung Lai
- Department of Medical Applied Chemistry, Chung Shan Medical University, Taichung 40201, Taiwan
| | - Ta-Hsien Chuang
- School of Pharmacy, China Medical University, Taichung 406040, Taiwan
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14
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Thesmar P, Coomar S, Prescimone A, Häussinger D, Gillingham D, Baudoin O. Divergent Synthesis of Bioactive Dithiodiketopiperazine Natural Products Based on a Double C(sp 3 )-H Activation Strategy. Chemistry 2020; 26:15298-15312. [PMID: 32852800 DOI: 10.1002/chem.202003683] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 08/26/2020] [Indexed: 12/28/2022]
Abstract
This article provides a detailed report of our efforts to synthesize the dithiodiketopiperazine (DTP) natural products (-)-epicoccin G and (-)-rostratin A using a double C(sp3 )-H activation strategy. The strategy's viability was first established on a model system lacking the C8/C8' alcohols. Then, an efficient stereoselective route including an organocatalytic epoxidation was secured to access a key bis-triflate substrate. This bis-triflate served as the functional handles for the key transformation of the synthesis: a double C(sp3 )-H activation. The successful double activation opened access to a common intermediate for both natural products in high overall yield and on a multigram scale. After several unsuccessful attempts, this intermediate was efficiently converted to (-)-epicoccin G and to the more challenging (-)-rostratin A via suitable oxidation/reduction and protecting group sequences, and via a final sulfuration that occurred in good yield and high diastereoselectivity. These efforts culminated in the synthesis of (-)-epicoccin G and (-)-rostratin A in high overall yields (19.6 % over 14 steps and 12.7 % over 17 steps, respectively), with the latter being obtained on a 500 mg scale. Toxicity assessments of these natural products and several analogues (including the newly synthesized epicoccin K) in the leukemia cell line K562 confirmed the importance of the disulfide bridge for activity and identified dianhydrorostratin A as a 20x more potent analogue.
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Affiliation(s)
- Pierre Thesmar
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056, Basel, Switzerland
| | - Seemon Coomar
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056, Basel, Switzerland
| | - Alessandro Prescimone
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056, Basel, Switzerland
| | - Daniel Häussinger
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056, Basel, Switzerland
| | - Dennis Gillingham
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056, Basel, Switzerland
| | - Olivier Baudoin
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056, Basel, Switzerland
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15
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Baudoin O. Mehrfache katalytische C‐H‐Bindungsfunktionalisierungen in der Naturstoffsynthese. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202001224] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Olivier Baudoin
- University of Basel Department of Chemistry St. Johanns-Ring 19 CH-4056 Basel Schweiz
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16
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Baudoin O. Multiple Catalytic C-H Bond Functionalization for Natural Product Synthesis. Angew Chem Int Ed Engl 2020; 59:17798-17809. [PMID: 32220111 DOI: 10.1002/anie.202001224] [Citation(s) in RCA: 96] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Indexed: 01/17/2023]
Abstract
In the past decade, multiple catalytic C-H bond functionalization has been successfully applied in natural product synthesis as a strategy to reduce the number of steps, increase overall yield and employ more easily available starting materials. This minireview presents selected examples making use of multiple C-H bond functionalization in conceptually different ways. First, linear syntheses are discussed, wherein multiple C-H functionalization is employed either from simple (hetero)cyclic cores, at a late stage, or to build polycyclic systems. Second, the use of multiple C-H functionalization as a strategic tool in convergent synthesis to access and couple complex fragments is discussed. Information on the scalability of the employed methods is provided when available. The presented cases indicate that multiple C-H functionalization strategies should play a great role to shape the future synthesis of functional complex molecules with improved sustainability.
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Affiliation(s)
- Olivier Baudoin
- University of Basel, Department of Chemistry, St. Johanns-Ring 19, CH-4056, Basel, Switzerland
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17
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A concise total synthesis of (−)-γ-lycorane via an aromatic C H alkylation of unactivated secondary alkyl iodide. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.151733] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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18
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Yuan Y, Pan G, Zhang X, Huang Q. One pot synthesis of pyrrolo[3,2,1-de]phenanthridines from 7-phenylindoles via tandem C–H olefination/aza-Michael addition. Org Chem Front 2020. [DOI: 10.1039/c9qo01135h] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
An unprecedented one-pot C–H olefination/aza-Michael addition tandem process has been developed for the synthesis of pyrrolo[3,2,1-de]phenanthridines from 7-phenylindoles and alkenes using a [Cp*RhCl2]2/AgOAc/Me4NOAc catalytic system.
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Affiliation(s)
- Yumeng Yuan
- Fujian Key Laboratory of Polymer Materials
- College of Chemistry & Materials Science
- Fujian Normal University
- Fuzhou
- P.R. China
| | - Guoshuai Pan
- Fujian Key Laboratory of Polymer Materials
- College of Chemistry & Materials Science
- Fujian Normal University
- Fuzhou
- P.R. China
| | - Xiaofeng Zhang
- Fujian Key Laboratory of Polymer Materials
- College of Chemistry & Materials Science
- Fujian Normal University
- Fuzhou
- P.R. China
| | - Qiufeng Huang
- Fujian Key Laboratory of Polymer Materials
- College of Chemistry & Materials Science
- Fujian Normal University
- Fuzhou
- P.R. China
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19
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Cao AZ, Xiao YT, Wu YC, Song RJ, Xie YX, Li JH. Copper-catalyzed C–H [3 + 2] annulation of N-substituted anilines with α-carbonyl alkyl bromides via C(sp3)–Br/C(sp2)–H functionalization. Org Biomol Chem 2020; 18:2170-2174. [DOI: 10.1039/d0ob00399a] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A copper-catalyzed C–H [3 + 2] annulation of N-substituted anilines with α-carbonyl alkyl bromides for the synthesis of 3,3′-disubstituted oxindoles is developed.
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Affiliation(s)
- An-Zhu Cao
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle
- Nanchang Hangkong University
- Nanchang 330063
- China
| | - Yu-Ting Xiao
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle
- Nanchang Hangkong University
- Nanchang 330063
- China
| | - Yan-Chen Wu
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle
- Nanchang Hangkong University
- Nanchang 330063
- China
| | - Ren-Jie Song
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle
- Nanchang Hangkong University
- Nanchang 330063
- China
| | - Ye-Xiang Xie
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle
- Nanchang Hangkong University
- Nanchang 330063
- China
| | - Jin-Heng Li
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle
- Nanchang Hangkong University
- Nanchang 330063
- China
- State Key Laboratory of Chemo/Biosensing and Chemometrics
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20
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Wan Y, Peng H, Yang Q, Liu W, Deng G. Selective Synthesis of 2-(4-Aminoaryl)-2-(4-pyranonyl)acetates and 2,2-Bis(4-aminoaryl)-2-(4-pyranonyl)acetates from 2-Diazo-3,5-dioxo-6-ynoates (ynones) and Aromatic Amines. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901342] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Yinbo Wan
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China); Hunan Normal University; 410081 Changsha China
- Key Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan Province; Hunan Normal University; 410081 Changsha China
| | - Haiyun Peng
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China); Hunan Normal University; 410081 Changsha China
- Key Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan Province; Hunan Normal University; 410081 Changsha China
| | - Qin Yang
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China); Hunan Normal University; 410081 Changsha China
- Key Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan Province; Hunan Normal University; 410081 Changsha China
| | - Weishun Liu
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China); Hunan Normal University; 410081 Changsha China
- Key Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan Province; Hunan Normal University; 410081 Changsha China
| | - Guisheng Deng
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China); Hunan Normal University; 410081 Changsha China
- Key Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan Province; Hunan Normal University; 410081 Changsha China
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21
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Thesmar P, Baudoin O. Efficient and Divergent Total Synthesis of (-)-Epicoccin G and (-)-Rostratin A Enabled by Double C(sp 3)-H Activation. J Am Chem Soc 2019; 141:15779-15783. [PMID: 31556609 DOI: 10.1021/jacs.9b09359] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Dithiodiketopiperazines are complex polycyclic natural products possessing a variety of interesting biological activities. Despite their interest, relatively few total syntheses have been completed. We herein report the enantioselective, scalable, and divergent total synthesis of two symmetrical pentacyclic dithiodiketopiperazines, (-)-epicoccin G and (-)-rostratin A. A common intermediate was synthesized on a multigram scale from inexpensive, commercially available starting materials using an enantioselective organocatalytic epoxidation and a double C(sp3)-H activation as key steps, with the latter allowing the efficient simultaneous construction of the two five-membered rings. In addition to the cis,cis-fused target (-)-epiccocin G, the more challenging (-)-rostratin A, possessing two trans ring junctions, was obtained for the first time on a 500 mg scale through the optimization of each step and validation on multigram quantities. Both natural products were synthesized with high overall yields (13-20%). This study should facilitate access to this fascinating and yet understudied family of biologically active natural products.
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Affiliation(s)
- Pierre Thesmar
- Department of Chemistry , University of Basel , St. Johanns-Ring 19 , CH-4056 Basel , Switzerland
| | - Olivier Baudoin
- Department of Chemistry , University of Basel , St. Johanns-Ring 19 , CH-4056 Basel , Switzerland
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22
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Rocaboy R, Baudoin O. 1,4-Palladium Shift/C(sp3)–H Activation Strategy for the Remote Construction of Five-Membered Rings. Org Lett 2019; 21:1434-1437. [DOI: 10.1021/acs.orglett.9b00187] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ronan Rocaboy
- University of Basel, Department of Chemistry, St. Johanns-Ring 19, CH-4056 Basel, Switzerland
| | - Olivier Baudoin
- University of Basel, Department of Chemistry, St. Johanns-Ring 19, CH-4056 Basel, Switzerland
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23
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Ding SL, Ji Y, Su Y, Li R, Gu P. Schmidt Reaction of ω-Azido Valeryl Chlorides Followed by Intermolecular Trapping of the Rearrangement Ions: Synthesis of Assoanine and Related Pyrrolophenanthridine Alkaloids. J Org Chem 2019; 84:2012-2021. [DOI: 10.1021/acs.joc.8b03018] [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)
- Shao-Lei Ding
- Department of Chemistry, Ningxia University, Yinchuan 750021, China
| | - Yang Ji
- Department of Chemistry, Ningxia University, Yinchuan 750021, China
| | - Yan Su
- Department of Chemistry, Ningxia University, Yinchuan 750021, China
| | - Rui Li
- Department of Chemistry, Ningxia University, Yinchuan 750021, China
| | - Peiming Gu
- Department of Chemistry, Ningxia University, Yinchuan 750021, China
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24
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Chida N, Sato T, Ishii K, Seki-Yoritate Y, Ishibashi M, Wai Liaw M, Oishi T. Total Synthesis of (–)-Zephyranthine. HETEROCYCLES 2019. [DOI: 10.3987/com-18-s(f)40] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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25
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Wahl MH, Jandl C, Bach T. A [2 + 2] Photocycloaddition–Fragmentation Approach toward the Carbon Skeleton of cis-Fused Lycorine-type Alkaloids. Org Lett 2018; 20:7674-7678. [DOI: 10.1021/acs.orglett.8b03402] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Maike H. Wahl
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, Lichtenbergstrasse 4, 85747 Garching, Germany
| | - Christian Jandl
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, Lichtenbergstrasse 4, 85747 Garching, Germany
| | - Thorsten Bach
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, Lichtenbergstrasse 4, 85747 Garching, Germany
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26
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Rao WH, Jiang LL, Zhao JX, Jiang X, Zou GD, Zhou YQ, Tang L. Selective O-Cyclization of N-Methoxy Aryl Amides with CH 2Br 2 or 1,2-DCE via Palladium-Catalyzed C-H Activation. Org Lett 2018; 20:6198-6201. [PMID: 30226060 DOI: 10.1021/acs.orglett.8b02678] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A selective O-cyclization of N-methoxy aryl amides with CH2Br2 or 1,2-DCE (1,2-dichloroethane) via palladium-catalyzed C-H activation has been described. New C(sp3)-O and C(sp2)-C(sp3) bonds are forged simultaneously with the assistance of an N-methoxy amide group, and good functional group tolerance in substrates is observed. Preliminary mechanistic investigations show that the process may involve a five-membered palladacycle intermediate.
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Affiliation(s)
- Wei-Hao Rao
- College of Chemistry and Chemical Engineering , Xinyang Normal University , Xinyang 464000 , China.,Henan Province Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan , Xinyang Normal University , Xinyang 464000 , China
| | - Li-Li Jiang
- College of Chemistry and Chemical Engineering , Xinyang Normal University , Xinyang 464000 , China
| | - Jin-Xiao Zhao
- College of Chemistry and Chemical Engineering , Xinyang Normal University , Xinyang 464000 , China
| | - Xin Jiang
- College of Chemistry and Chemical Engineering , Xinyang Normal University , Xinyang 464000 , China
| | - Guo-Dong Zou
- College of Chemistry and Chemical Engineering , Xinyang Normal University , Xinyang 464000 , China
| | - Yu-Qiang Zhou
- College of Chemistry and Chemical Engineering , Xinyang Normal University , Xinyang 464000 , China
| | - Lin Tang
- College of Chemistry and Chemical Engineering , Xinyang Normal University , Xinyang 464000 , China
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27
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Grosheva D, Cramer N. Enantioselective Access to 1H
-Isoindoles with Quaternary Stereogenic Centers by Palladium(0)-Catalyzed C−H Functionalization. Angew Chem Int Ed Engl 2018; 57:13644-13647. [DOI: 10.1002/anie.201809173] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Indexed: 12/27/2022]
Affiliation(s)
- Daria Grosheva
- Laboratory of Asymmetric Catalysis and Synthesis; EPFL SB ISIC LCSA, BCH 4305; 1015 Lausanne Switzerland
| | - Nicolai Cramer
- Laboratory of Asymmetric Catalysis and Synthesis; EPFL SB ISIC LCSA, BCH 4305; 1015 Lausanne Switzerland
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28
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Grosheva D, Cramer N. Enantioselective Access to 1H
-Isoindoles with Quaternary Stereogenic Centers by Palladium(0)-Catalyzed C−H Functionalization. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201809173] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Daria Grosheva
- Laboratory of Asymmetric Catalysis and Synthesis; EPFL SB ISIC LCSA, BCH 4305; 1015 Lausanne Switzerland
| | - Nicolai Cramer
- Laboratory of Asymmetric Catalysis and Synthesis; EPFL SB ISIC LCSA, BCH 4305; 1015 Lausanne Switzerland
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29
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Rocaboy R, Dailler D, Zellweger F, Neuburger M, Salomé C, Clot E, Baudoin O. Domino Pd0
-Catalyzed C(sp3
)-H Arylation/Electrocyclic Reactions via Benzazetidine Intermediates. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201807097] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Ronan Rocaboy
- University of Basel; Department of Chemistry; St. Johanns-Ring 19, CH- 4056 Basel Switzerland
| | - David Dailler
- University of Basel; Department of Chemistry; St. Johanns-Ring 19, CH- 4056 Basel Switzerland
| | - Florian Zellweger
- University of Basel; Department of Chemistry; St. Johanns-Ring 19, CH- 4056 Basel Switzerland
| | - Markus Neuburger
- University of Basel; Department of Chemistry; St. Johanns-Ring 19, CH- 4056 Basel Switzerland
| | - Christophe Salomé
- SpiroChem AG; Rosental area, WRO-1047-3; Mattenstrasse 24, CH- 4058 Basel Switzerland
| | - Eric Clot
- Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-UM-ENSCM; Université de Montpellier; cc 1501, Place Eugène Bataillon, F- 34095 Montpellier Cedex 5 France
| | - Olivier Baudoin
- University of Basel; Department of Chemistry; St. Johanns-Ring 19, CH- 4056 Basel Switzerland
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30
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Rocaboy R, Dailler D, Zellweger F, Neuburger M, Salomé C, Clot E, Baudoin O. Domino Pd0
-Catalyzed C(sp3
)-H Arylation/Electrocyclic Reactions via Benzazetidine Intermediates. Angew Chem Int Ed Engl 2018; 57:12131-12135. [DOI: 10.1002/anie.201807097] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 07/17/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Ronan Rocaboy
- University of Basel; Department of Chemistry; St. Johanns-Ring 19, CH- 4056 Basel Switzerland
| | - David Dailler
- University of Basel; Department of Chemistry; St. Johanns-Ring 19, CH- 4056 Basel Switzerland
| | - Florian Zellweger
- University of Basel; Department of Chemistry; St. Johanns-Ring 19, CH- 4056 Basel Switzerland
| | - Markus Neuburger
- University of Basel; Department of Chemistry; St. Johanns-Ring 19, CH- 4056 Basel Switzerland
| | - Christophe Salomé
- SpiroChem AG; Rosental area, WRO-1047-3; Mattenstrasse 24, CH- 4058 Basel Switzerland
| | - Eric Clot
- Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-UM-ENSCM; Université de Montpellier; cc 1501, Place Eugène Bataillon, F- 34095 Montpellier Cedex 5 France
| | - Olivier Baudoin
- University of Basel; Department of Chemistry; St. Johanns-Ring 19, CH- 4056 Basel Switzerland
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31
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Song X, Gao C, Li B, Zhang X, Fan X. Regioselective Synthesis of 2-Alkenylindoles and 2-Alkenylindole-3-carboxylates through the Cascade Reactions of N-Nitrosoanilines with Propargyl Alcohols. J Org Chem 2018; 83:8509-8521. [DOI: 10.1021/acs.joc.8b01098] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Xia Song
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
| | - Cai Gao
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
| | - Bin Li
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xinying Zhang
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xuesen Fan
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
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