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Basak SJ, Dash J. Potassium tert-Butoxide-Mediated Cascade Synthesis of Rutaecarpine Alkaloid Analogues: Access to Molecular Complexity on Multigram Scales. J Org Chem 2024; 89:233-244. [PMID: 38037902 DOI: 10.1021/acs.joc.3c01996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2023]
Abstract
In this study, we present a novel and cost-effective approach for synthesizing biologically significant analogues of rutaecarpine alkaloid through a one-step cascade reaction. The pentacyclic core of rutaecarpine alkaloid analogues is efficiently constructed using 2-aminobenzonitriles and substituted indole-2-carbaldehydes in the presence of the affordable base KOtBu. The salient feature of this approach is the promotion of a sequential cascade process within a single reaction vessel including the formation of a dihydroquinazolinone ring, oxidation, and cyclization. This method can be successfully applied on a larger scale, making it economically viable.
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Affiliation(s)
- Soumya Jyoti Basak
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Jyotirmayee Dash
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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2
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Oparina LA, Kolyvanov NA, Ushakov IA, Nikitina LP, Petrova OV, Sobenina LN, Petrushenko KB, Trofimov BA. Contributing to Biochemistry and Optoelectronics: Pyrrolo[1',2':2,3]imidazo[1,5- a]indoles and Cyclohepta[4,5]pyrrolo[1,2- c]pyrrolo[1,2- a]imidazoles via [3+2] Annulation of Acylethynylcycloalka[ b]pyrroles with Δ 1-Pyrrolines. Int J Mol Sci 2023; 24:ijms24043404. [PMID: 36834813 PMCID: PMC9959468 DOI: 10.3390/ijms24043404] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 02/02/2023] [Accepted: 02/05/2023] [Indexed: 02/11/2023] Open
Abstract
Available pyrrolylalkynones with tetrahydroindolyl, cycloalkanopyrrolyl, and dihydrobenzo[g]indolyl moieties, acylethynylcycloalka[b]pyrroles, are readily annulated with Δ1-pyrrolines (MeCN/THF, 70 °C, 8 h) to afford a series of novel pyrrolo[1',2':2,3]imidazo[1,5-a]indoles and cyclohepta[4,5]pyrrolo[1,2-c]pyrrolo[1,2-a]imidazoles functionalized with an acylethenyl group in up to an 81% yield. This original synthetic approach contributes to the arsenal of chemical methods promoting drug discovery. Photophysical studies show that some of the synthesized compounds, e.g., benzo[g]pyrroloimidazoindoles, are prospective candidates for TADF emitters of OLED.
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3
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Oparina LA, Belyaeva KV, Kolyvanov NA, Ushakov IA, Gotsko MD, Sobenina LN, Vashchenko AV, Trofimov BA. Catalyst-Free Annulation of Acylethynylpyrroles with 1-Pyrrolines: A Straightforward Access to Tetrahydrodipyrrolo[1,2- a:1',2'- c]imidazoles. J Org Chem 2022; 87:9518-9531. [PMID: 35849567 DOI: 10.1021/acs.joc.2c00476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Acylethynylpyrroles undergo facile (rt, MeCN or MeOH, 24-72 h) catalyst-free annulation with 1-pyrrolines to afford acylmethylenetetrahydrodipyrrolo[1,2-a:1',2'-c]imidazoles in up to 93% yield and 90% E-stereoselectivity of the olefin moiety.
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Affiliation(s)
- Ludmila A Oparina
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences, 1 Favorsky Str., 664033 Irkutsk, Russia
| | - Kseniya V Belyaeva
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences, 1 Favorsky Str., 664033 Irkutsk, Russia
| | - Nikita A Kolyvanov
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences, 1 Favorsky Str., 664033 Irkutsk, Russia
| | - Igor A Ushakov
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences, 1 Favorsky Str., 664033 Irkutsk, Russia
| | - Maxim D Gotsko
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences, 1 Favorsky Str., 664033 Irkutsk, Russia
| | - Lyubov' N Sobenina
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences, 1 Favorsky Str., 664033 Irkutsk, Russia
| | - Alexander V Vashchenko
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences, 1 Favorsky Str., 664033 Irkutsk, Russia
| | - Boris A Trofimov
- A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences, 1 Favorsky Str., 664033 Irkutsk, Russia
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4
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Liu SS, Yang L, Kong FD, Zhao JH, Yao L, Yuchi ZG, Ma QY, Xie QY, Zhou LM, Guo MF, Dai HF, Zhao YX, Luo DQ. Three New Quinazoline-Containing Indole Alkaloids From the Marine-Derived Fungus Aspergillus sp. HNMF114. Front Microbiol 2021; 12:680879. [PMID: 34149672 PMCID: PMC8206283 DOI: 10.3389/fmicb.2021.680879] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 04/15/2021] [Indexed: 11/20/2022] Open
Abstract
By feeding tryptophan to the marine-derived fungus Aspergillus sp. HNMF114 from the bivalve mollusk Sanguinolaria chinensis, 3 new quinazoline-containing indole alkaloids, named aspertoryadins H–J (1–3), along with 16 known ones (4–19), were obtained. The structures of the new compounds were elucidated by the analysis of spectroscopic data combined with quantum chemical calculations of nuclear magnetic resonance (NMR) chemical shifts and electron capture detector (ECD) spectra. Structurally, compound 3 represents the first example of this type of compound, bearing an amide group at C-3. Compounds 10 and 16 showed potent α-glucosidase inhibitory activity with IC50 values of 7.18 and 5.29 μM, and compounds 13 and 14 showed a clear activation effect on the ryanodine receptor from Spodoptera frugiperda (sfRyR), which reduced the [Ca2+]ER by 37.1 and 36.2%, respectively.
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Affiliation(s)
- Sha-Sha Liu
- College of Life Science, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, Hebei University, Baoding, China
| | - Li Yang
- Haikou Key Laboratory for Research and Utilization of Tropical Natural Products, Institute of Tropical Bioscience and Biotechnology, CATAS, Haikou, China
| | - Fan-Dong Kong
- Key Laboratory of Chemistry and Engineering of Forest Products, State Ethnic Affairs Commission, Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning, China
| | - Jia-Hui Zhao
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, Collaborative Innovation Center of Chemical Science and Engineering, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China
| | - Li Yao
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, Collaborative Innovation Center of Chemical Science and Engineering, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China
| | - Zhi-Guang Yuchi
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, Collaborative Innovation Center of Chemical Science and Engineering, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China
| | - Qing-Yun Ma
- Haikou Key Laboratory for Research and Utilization of Tropical Natural Products, Institute of Tropical Bioscience and Biotechnology, CATAS, Haikou, China
| | - Qing-Yi Xie
- Haikou Key Laboratory for Research and Utilization of Tropical Natural Products, Institute of Tropical Bioscience and Biotechnology, CATAS, Haikou, China
| | - Li-Man Zhou
- Key Laboratory of Chemistry and Engineering of Forest Products, State Ethnic Affairs Commission, Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning, China
| | - Meng-Fei Guo
- Key Laboratory of Chemistry and Engineering of Forest Products, State Ethnic Affairs Commission, Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning, China
| | - Hao-Fu Dai
- Hainan Institute for Tropical Agricultural Resources, CATAS, Haikou, China
| | - You-Xing Zhao
- Haikou Key Laboratory for Research and Utilization of Tropical Natural Products, Institute of Tropical Bioscience and Biotechnology, CATAS, Haikou, China
| | - Du-Qiang Luo
- College of Life Science, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, Hebei University, Baoding, China
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5
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Abstract
The field of total synthesis has reached a stage in which emphasis has been increasingly focused on synthetic efficiency rather than merely achieving the synthesis of a target molecule. The pursuit of synthetic efficiency, typically represented by step count and overall yield, is a rich source of inspiration and motivation for synthetic chemists to invent innovative strategies and methods. Among them, convergent strategy has been well recognized as an effective approach to improve efficiency. This strategy generally involves coupling of fragments with similar complexity to furnish the target molecule via subsequent cyclization or late-stage functionalization. Thus, methodologies that enable effective connection of fragments are critical to devising a convergent plan. In our laboratory, convergent strategy has served as a long-standing principle for pursuing efficient synthesis during the course of planning and implementing synthetic projects. In this Account, we summarize our endeavors in the convergent synthesis of natural products over the last ten years. We show how we identify reasonable bond disconnections and employ enabling synthetic methodologies to maximize convergency, leading to the efficient syntheses of over two-dozen highly complex molecules from eight disparate families.In detail, we categorize our work into three parts based on the diverse reaction types for fragment assembly. First, we demonstrate the application of a powerful single-electron reducing agent, SmI2, in a late-stage cyclization step, forging the polycyclic skeletons of structurally fascinating Galbulimima alkaloids and Leucosceptrum sesterterpenoids. Next, we showcase how three different types of cycloaddition reactions can simultaneously construct two challenging C-C bonds in a single step, providing concise entries to three distinct families, namely, spiroquinazoline alkaloids, gracilamine, and kaurane diterpenoids. In the third part, we describe convergent assembly of ent-kaurane diterpenoids, gelsedine-type alkaloids, and several drug molecules via employing some bifunctional synthons. To access highly oxidized ent-kaurane diterpenoids, we introduce the hallmark bicyclo[3.2.1]octane ring system at an early stage, and then execute coupling and cyclization by means of a Hoppe's homoaldol reaction and a Mukaiyama-Michael-type addition, respectively. Furthermore, we showcase how the orchestrated combination of an asymmetric Michael addition, a tandem oxidation-aldol reaction and a pinacol rearrangement can dramatically improve the efficiency in synthesizing gelsedine-type alkaloids, with nary a protecting group. Finally, to address the supply issue of several drugs, including anti-influenza drug zanamivir and antitumor agent Et-743, we exploit scalable and practical approaches to provide advantages over current routes in terms of cost, ease of execution, and efficiency.
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Affiliation(s)
- Yang Gao
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China
| | - Dawei Ma
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China
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6
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Badart MP, Hawkins BC. Synthetic Strategies to Access Heteroatomic Spirocentres Embedded in Natural Products. SYNTHESIS-STUTTGART 2021. [DOI: 10.1055/a-1379-2312] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
AbstractThe spirocyclic motif is abundant in natural products and provides an ideal three-dimensional template to interact with biological targets. With significant attention historically expended on the synthesis of flat-heterocyclic compound libraries, methods to access the less-explored three-dimensional medicinal-chemical space will continue to increase in demand. Herein, we highlight by reaction class the common strategies used to construct the spirocyclic centres embedded in a series of well-studied natural products.1 Introduction2 Cycloadditions3 Palladium-Catalysed Coupling Reactions4 Conjugate Additions5 Imines, Aminals, and Hemiaminal Ethers6 Mannich-Type Reactions7 Oxidative Dearomatisation8 Alkylation9 Organometallic Additions10 Conclusions
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7
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Tang QG, Cai SL, Wang CC, Lin GQ, Sun XW. Organocatalytic Aza-Michael/Michael Cyclization Cascade Reaction: Enantioselective Synthesis of Spiro-oxindole Piperidin-2-one Derivatives. Org Lett 2020; 22:3351-3355. [PMID: 32281799 DOI: 10.1021/acs.orglett.0c00779] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A simple, direct, and highly enantioselective synthesis of spiro-oxindole piperidin-2-one derivatives was achieved through an aza-Michael/Michael cyclization cascade sequence using a squaramide catalyst. The desired products were obtained in excellent yields (up to 99%) and good to high stereoselectivities (up to >20:1 dr and up to 99% ee) under mild conditions.
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Affiliation(s)
- Qing-Gang Tang
- Department of Chemistry, Fudan University, Shanghai 200433, China
| | - Sen-Lin Cai
- Department of Chemistry, Fudan University, Shanghai 200433, China
| | - Chuan-Chuan Wang
- Department of Chemistry, Fudan University, Shanghai 200433, China
| | - Guo-Qiang Lin
- Department of Chemistry, Fudan University, Shanghai 200433, China.,CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Xing-Wen Sun
- Department of Chemistry, Fudan University, Shanghai 200433, China
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8
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Resende DISP, Boonpothong P, Sousa E, Kijjoa A, Pinto MMM. Chemistry of the fumiquinazolines and structurally related alkaloids. Nat Prod Rep 2019; 36:7-34. [DOI: 10.1039/c8np00043c] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
This review covers the isolation, structure elucidation, biological activities, biosynthetic pathways, and synthetic studies of the 77 fumiquinazolines and structurally related alkaloids described up to 2018.
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Affiliation(s)
- Diana I. S. P. Resende
- Laboratory of Organic and Pharmaceutical Chemistry
- Faculty of Pharmaceutical Sciences
- University of Porto
- 4050-313 Porto
- Portugal
| | - Papichaya Boonpothong
- Laboratory of Organic and Pharmaceutical Chemistry
- Faculty of Pharmaceutical Sciences
- University of Porto
- 4050-313 Porto
- Portugal
| | - Emília Sousa
- Laboratory of Organic and Pharmaceutical Chemistry
- Faculty of Pharmaceutical Sciences
- University of Porto
- 4050-313 Porto
- Portugal
| | - Anake Kijjoa
- Interdisciplinary Centre of Marine and Environmental Research (CIIMAR)
- Terminal de Cruzeiros do Porto de Leixões
- Matosinhos
- Portugal
- ICBAS-Instituto de Ciências Biomédicas Abel Salazar
| | - Madalena M. M. Pinto
- Laboratory of Organic and Pharmaceutical Chemistry
- Faculty of Pharmaceutical Sciences
- University of Porto
- 4050-313 Porto
- Portugal
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9
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Shen J, Xu B, Zhang M, Su W. Branched-Selective Decarboxylative Heck Reaction with Electronically Unbiased Olefins. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800330] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Jianchen Shen
- College of Chemistry; Fuzhou University; 350108 Fuzhou Fujian China
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Yangqiao West Road 155 350002 Fuzhou Fujian China
| | - Biping Xu
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Yangqiao West Road 155 350002 Fuzhou Fujian China
| | - Min Zhang
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Yangqiao West Road 155 350002 Fuzhou Fujian China
| | - Weiping Su
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Yangqiao West Road 155 350002 Fuzhou Fujian China
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10
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Sun Z, Tian S, Li S, Liu Y, Zhang Y, Li Y. Facile synthesis of thiochromanyl-spirooxindoles via K 2 CO 3 catalyzed tandem sulfa-Michael/Aldol reaction. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.07.033] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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11
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Li Y, Li J, Ding H, Li A. Recent advances on the total synthesis of alkaloids in mainland China. Natl Sci Rev 2017. [DOI: 10.1093/nsr/nwx050] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
AbstractAlkaloids are a large family of natural products that mostly contain basic nitrogen atoms. Because of their intriguing structures and important functions, they have long been popular targets for synthetic organic chemists. China's chemists have made significant progress in the area of alkaloid synthesis over past decades. In this article, selected total syntheses of alkaloids from research groups in mainland China during the period 2011–16 are highlighted.
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Affiliation(s)
- Yong Li
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
- Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, Shaoxing University, Shaoxing 312000, China
| | - Jian Li
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Hanfeng Ding
- Department of Chemistry, Zhejiang University, Hangzhou 310028, China
| | - Ang Li
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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12
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Modugu NR, Pittala PK. Polyethylene glycol (PEG-400) promoted as an efficient and recyclable reaction medium for the one-pot eco-friendly synthesis of functionalized isoxazole substituted spirooxindole derivatives. NEW J CHEM 2017. [DOI: 10.1039/c7nj03515b] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient, inexpensive and environmentally friendly synthesis of novel isoxazole substituted spirooxindole-pyridopyrimidine/indenopyridine/chromenopyridine/naphthyridine/quinoline derivatives has been developed.
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Affiliation(s)
- Nagi Reddy Modugu
- Division of Natural Products Chemistry (CSIR)
- Indian Institute of Chemical Technology
- Hyderabad
- India
| | - Praveen Kumar Pittala
- Division of Natural Products Chemistry (CSIR)
- Indian Institute of Chemical Technology
- Hyderabad
- India
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13
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Cao MH, Green NJ, Xu SZ. Application of the aza-Diels–Alder reaction in the synthesis of natural products. Org Biomol Chem 2017; 15:3105-3129. [DOI: 10.1039/c6ob02761j] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Diels–Alder reaction that involves a nitrogen atom in the diene or dienophile is termed the aza-Diels–Alder reaction.
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Affiliation(s)
- Min-Hui Cao
- College of Science
- Huazhong Agricultural University
- Wuhan
- China
- Department of Pharmacy
| | - Nicholas J. Green
- Research School of Chemistry
- Australian National University
- ACT
- Canberra
- Australia
| | - Sheng-Zhen Xu
- College of Science
- Huazhong Agricultural University
- Wuhan
- China
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14
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15
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Balaji PV, Chandrasekaran S. Stereoselective Anti-Markovnikov Geminal Diamination and Dioxygenation of Vinylarenes Mediated by the Bromonium Ion. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600203] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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16
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Mailyan AK, Eickhoff JA, Minakova AS, Gu Z, Lu P, Zakarian A. Cutting-Edge and Time-Honored Strategies for Stereoselective Construction of C–N Bonds in Total Synthesis. Chem Rev 2016; 116:4441-557. [DOI: 10.1021/acs.chemrev.5b00712] [Citation(s) in RCA: 111] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Artur K. Mailyan
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - John A. Eickhoff
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Anastasiia S. Minakova
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Zhenhua Gu
- Department
of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Ping Lu
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Armen Zakarian
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
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17
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Petkovic M, Nasufovic V, Djukanovic D, Vujosevic ZT, Jadranin M, Matovic R, Savic V. Cyclative Cascades of Allenamides Derived from Amino Acids: Synthesis of Annulated Indoxyl Derivatives. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600067] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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18
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Rebora A. Trichodynia: a review of the literature. Int J Dermatol 2015; 55:382-4. [PMID: 26696219 DOI: 10.1111/ijd.13204] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Revised: 08/19/2015] [Accepted: 09/22/2015] [Indexed: 11/27/2022]
Abstract
Trichodynia designates a painful sensation on the scalp sometimes reported by patients with hair loss. Its best description dates back to 1960, when Sulzberger et al. (Arch Dermatol 1960; 81: 556-560) reported it in a proportion of women complaining of an unexplained diffuse alopecia. Sulzberger et al.'s remark that trichodynia may also be circumscribed ("spotty") is an important detail missed by most ensuing observers. Women are mostly affected or, at least, more likely to report it. The quality and intensity vary greatly, the "burning" variety being most severe. Whether trichodynia is prevalent in telogen effluvium or it may also be present in androgenetic alopecia remains a crucial question. Hairs shed only from painful sites, and this observation suggests that the severity of trichodynia is directly related to hair shedding and intensity. Trichodynia seems to be related to the release of substance P and is present in alopecia areata. Both observations suggest that peripilar inflammation may be a causative agent.
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19
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Liu Y, Xue J, Sun Z, Liu D, Xing Y, Li Y. Substituent-Controlled Selective Synthesis of Spirooxindoles and Oxazolyloxindoles via Two Tandem Reactions. ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201500290] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yun Liu
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; 222 Tianshui South Rd. Lanzhou 730000, Gansu P. R. China
| | - Jijun Xue
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; 222 Tianshui South Rd. Lanzhou 730000, Gansu P. R. China
| | - Zhou Sun
- College of Chemical Science and Engineering; Qingdao University; 308 Ningxia Rd. Qingdao 266000, Shandong P. R. China
| | - Dongxue Liu
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; 222 Tianshui South Rd. Lanzhou 730000, Gansu P. R. China
| | - Yacheng Xing
- College of Chemical Science and Engineering; Qingdao University; 308 Ningxia Rd. Qingdao 266000, Shandong P. R. China
| | - Ying Li
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; 222 Tianshui South Rd. Lanzhou 730000, Gansu P. R. China
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20
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Zheng C, Stahl SS. Regioselective aerobic oxidative Heck reactions with electronically unbiased alkenes: efficient access to α-alkyl vinylarenes. Chem Commun (Camb) 2015; 51:12771-4. [PMID: 26166679 PMCID: PMC4522933 DOI: 10.1039/c5cc05312a] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Branched-selective oxidative Heck coupling reactions have been developed between arylboronic acids and electronically unbiased terminal alkenes. The reactions exhibit high catalyst-controlled regioselectivity favoring the less common branched isomer. The reactions employ a catalyst composed of Pd(TFA)2/dmphen (TFA = trifluoroacetate, dmphen = 2,9-dimethyl-1,10-phenanthroline) and proceed efficiently at 45-60 °C under 1 atm of O2 without requiring other additives. A broad array of functional groups, including aryl halide, allyl silane and carboxylic acids are tolerated.
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Affiliation(s)
- Changwu Zheng
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, WI 53706, USA.
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Kshirsagar UA. Recent developments in the chemistry of quinazolinone alkaloids. Org Biomol Chem 2015; 13:9336-52. [DOI: 10.1039/c5ob01379h] [Citation(s) in RCA: 191] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
This review focuses on the recent advances in the chemistry of quinazolinone alkaloids which covers the newly isolated quinazolinone alkaloids with their biological activities and the recently reported total syntheses of quinazolinone alkaloids from 2006 to 2015.
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Affiliation(s)
- U. A. Kshirsagar
- Department of Chemistry
- Savitribai Phule Pune University (Formerly: University of Pune)
- Pune 411007
- India
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22
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Ishikura M, Abe T, Choshi T, Hibino S. Simple indole alkaloids and those with a nonrearranged monoterpenoid unit. Nat Prod Rep 2015; 32:1389-471. [DOI: 10.1039/c5np00032g] [Citation(s) in RCA: 160] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This review summarizes the isolation, structure determination, total syntheses and biological activities of simple indole alkaloids and those with a nonrearranged monoterpenoid unit, with literature coverage from 2012 to 2013.
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Affiliation(s)
- Minoru Ishikura
- School of Pharmaceutical Sciences
- Health Sciences University of Hokkaido
- Ishikari-Tobetsu
- Japan
| | - Takumi Abe
- School of Pharmaceutical Sciences
- Health Sciences University of Hokkaido
- Ishikari-Tobetsu
- Japan
| | - Tominari Choshi
- Graduate School of Pharmacy & Pharmaceutical Sciences
- Faculty of Pharmacy & Pharmaceutical Sciences
- Fukuyama University
- Fukuyama
- Japan
| | - Satoshi Hibino
- Graduate School of Pharmacy & Pharmaceutical Sciences
- Faculty of Pharmacy & Pharmaceutical Sciences
- Fukuyama University
- Fukuyama
- Japan
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23
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Liu H, Jiang G, Pan X, Wan X, Lai Y, Ma D, Xie W. Highly Asymmetric Bromocyclization of Tryptophol: Unexpected Accelerating Effect of DABCO-Derived Bromine Complex. Org Lett 2014; 16:1908-11. [DOI: 10.1021/ol5004109] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Huan Liu
- State Key Laboratory of Natural Medicines, Center of
Drug Discovery, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, China
| | - Guangde Jiang
- State Key Laboratory of Natural Medicines, Center of
Drug Discovery, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, China
| | - Xixian Pan
- Department
of Chemistry, School of Science, Shanghai University, No. 99, Shangda
Road, Shanghai 200444, China
| | - Xiaolong Wan
- State Key Laboratory of Bioorganic & Natural Products Chemistry, Shanghai Institute of Organic Chemistry Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China
| | - Yisheng Lai
- State Key Laboratory of Natural Medicines, Center of
Drug Discovery, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, China
| | - Dawei Ma
- State Key Laboratory of Bioorganic & Natural Products Chemistry, Shanghai Institute of Organic Chemistry Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China
| | - Weiqing Xie
- State Key Laboratory of Bioorganic & Natural Products Chemistry, Shanghai Institute of Organic Chemistry Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China
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