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Xie XQ, Li X, Liu PN. Enantioselective synthesis of spiro- N, O-ketals via iridium and Brønsted acid co-catalyzed asymmetric formal [4+2] cycloaddition. Chem Commun (Camb) 2024; 60:1448-1451. [PMID: 38213273 DOI: 10.1039/d3cc05923e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2024]
Abstract
We present an iridium and Brønsted acid co-catalyzed enantioselective formal [4+2] cycloaddition reaction of cyclic enamides with 2-(1-hydroxyallyl)phenols. This method yields a wide range of N-unsubstituted spiro-N,O-ketals, with good efficiency (up to 94%) and excellent enantioselectivities (most >95% ee). The protocol features easy scale-up and facile product derivatization.
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Affiliation(s)
- Xiang-Qi Xie
- Shanghai Key Laboratory of Functional Materials Chemistry, Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai 200237, China.
| | - Xingguang Li
- Shanghai Key Laboratory of Functional Materials Chemistry, Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai 200237, China.
| | - Pei-Nian Liu
- Shanghai Key Laboratory of Functional Materials Chemistry, Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai 200237, China.
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2
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Zeng J, Huang W, Tian X, Hu X, Wu Z. Brewer’s spent grain fermentation improves its soluble sugar and protein as well as enzymatic activities using Bacillus velezensis. Process Biochem 2021. [DOI: 10.1016/j.procbio.2021.10.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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3
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Nishimura K, Hanzawa R, Sugai T, Fuwa H. Ruthenium-Catalyzed Intramolecular Double Hydrofunctionalization of Alkynes. Synthesis of Spirocyclic Hemiaminal Ethers and Their Lewis Acid-Mediated Cleavage/Nucleophilic Addition. J Org Chem 2021; 86:6674-6697. [PMID: 33861607 DOI: 10.1021/acs.joc.1c00443] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[RuCl2(p-cymene)]2/AgNO3-catalyzed intramolecular double hydrofunctionalization of internal alkynes having nitrogen and oxygen nucleophilic groups at appropriate positions provided a series of spirocyclic hemiaminal ether derivatives in good to excellent yields. The product spiro-hemiaminal ethers underwent Lewis acid-mediated chemoselective cleavage, and in situ-generated iminium/oxocarbenium ions could be trapped with nucleophiles to afford a range of nitrogen and oxygen heterocycles.
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Affiliation(s)
- Kazuma Nishimura
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
| | - Ryohei Hanzawa
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
| | - Tomoya Sugai
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
| | - Haruhiko Fuwa
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
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4
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La Ferla B, D’Orazio G. Pyranoid Spirosugars as Enzyme Inhibitors. Curr Org Synth 2021; 18:3-22. [DOI: 10.2174/1570179417666200924152648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 08/25/2020] [Accepted: 08/31/2020] [Indexed: 11/22/2022]
Abstract
Background:
Pyranoid spirofused sugar derivatives represent a class of compounds with a significant
impact in the literature. From the structural point of view, the rigidity inferred by the spirofused entity has made
these compounds object of interest mainly as enzymatic inhibitors, in particular, carbohydrate processing enzymes.
Among them glycogen phosphorylase and sodium glucose co-transporter 2 are important target enzymes
for diverse pathological states. Most of the developed compounds present the spirofused entity at the C1 position
of the sugar moiety; nevertheless, spirofused entities can also be found at other sugar ring positions. The main
spirofused entities encountered are spiroacetals/thioacetals, spiro-hydantoin and derivatives, spiro-isoxazolines,
spiro-aminals, spiro-lactams, spiro-oxathiazole and spiro-oxazinanone, but also others are present.
Objectives:
The present review focuses on the most explored synthetic strategies for the preparation of this class
of compounds, classified according to the position and structure of the spirofused moiety on the pyranoid scaffold.
Moreover, the structures are correlated to their main biological activities or to their role as chiral auxiliaries.
Conclusion:
It is clear from the review that, among the different derivatives, the spirofused structures at position
C1 of the pyranoid scaffold are the most represented and possess the most relevant enzymatic inhibitor activities.
Nevertheless, great efforts have been devoted to the introduction of the spirofused entity also in the other positions,
mainly for the preparation of biologically active compounds but also for the synthesis of chiral auxiliaries
useful in asymmetric reactions; examples of such auxiliaries are the spirofused chiral 1,3-oxazolidin-2-ones and
1,3-oxazolidine-2-thiones.
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Affiliation(s)
- Barbara La Ferla
- Department of Biotechnology and Bioscience, University of Milano-Bicocca, Milan, Italy
| | - Giuseppe D’Orazio
- Department of Biotechnology and Bioscience, University of Milano-Bicocca, Milan, Italy
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Rajput J, Hotha S, Vangala M. AuBr 3-catalyzed azidation of per- O-acetylated and per- O-benzoylated sugars. Beilstein J Org Chem 2018; 14:682-687. [PMID: 29623131 PMCID: PMC5870170 DOI: 10.3762/bjoc.14.56] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2017] [Accepted: 03/05/2018] [Indexed: 12/23/2022] Open
Abstract
Herein we report, for the first time, the successful anomeric azidation of per-O-acetylated and per-O-benzoylated sugars by catalytic amounts of oxophilic AuBr3 in good to excellent yields. The method is applicable to a wide range of easily accessible per-O-acetylated and per-O-benzoylated sugars. While reaction with per-O-acetylated and per-O-benzoylated monosaccharides was complete within 1-3 h at room temperature, the per-O-benzoylated disaccharides needed 2-3 h of heating at 55 °C.
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Affiliation(s)
- Jayashree Rajput
- Department of Chemistry, Indian Institute of Science Education and Research, Pune 411 008, India
| | - Srinivas Hotha
- Department of Chemistry, Indian Institute of Science Education and Research, Pune 411 008, India
| | - Madhuri Vangala
- Department of Chemistry, Indian Institute of Science Education and Research, Pune 411 008, India
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6
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Synthesis of Spironucleosides: Past and Future Perspectives. Molecules 2017; 22:molecules22112028. [PMID: 29165398 PMCID: PMC6150341 DOI: 10.3390/molecules22112028] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Revised: 11/17/2017] [Accepted: 11/19/2017] [Indexed: 01/23/2023] Open
Abstract
Spironucleosides are a type of conformationally restricted nucleoside analogs in which the anomeric carbon belongs simultaneously to the sugar moiety and to the base unit. This locks the nucleic base in a specific orientation around the N-glycosidic bond, imposing restrictions on the flexibility of the sugar moiety. Anomeric spiro-functionalized nucleosides have gained considerable importance with the discovery of hydantocidin, a natural spironucleoside isolated from fermentation broths of Streptomyces hygroscopicus which exhibits potent herbicidal activity. The biological activity of hydantocidin has prompted considerable synthetic interest in this nucleoside and also in a variety of analogues, since important pharmaceutical leads can be found among modified nucleoside analogues. We present here an overview of the most important advances in the synthesis of spironucleosides.
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Dommaraju Y, Borthakur S, Prajapati D. Rapid Access to Indoline Spiropyran Scaffolds by Domino-Knoevenagel/oxa-Diels-Alder (DKODA) Reaction at Room Temperature. ChemistrySelect 2016. [DOI: 10.1002/slct.201601707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yuvaraj Dommaraju
- Applied Organic Chemistry Group, Chemical Science & Technology Division; CSIR-North-East Institute of Science and Technology; Jorhat- 785006, Assam
- Academy of Scientific and Innovative Research; New Delhi India
| | - Somadrita Borthakur
- Applied Organic Chemistry Group, Chemical Science & Technology Division; CSIR-North-East Institute of Science and Technology; Jorhat- 785006, Assam
| | - Dipak Prajapati
- Applied Organic Chemistry Group, Chemical Science & Technology Division; CSIR-North-East Institute of Science and Technology; Jorhat- 785006, Assam
- Academy of Scientific and Innovative Research; New Delhi India
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9
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Lahiri R, Palanivel A, Kulkarni SA, Vankar YD. Synthesis of Isofagomine–Pyrrolidine Hybrid Sugars and Analogues of (−)-Steviamine and (+)-Hyacinthacine C5 Using 1,3-Dipolar Cycloaddition Reactions. J Org Chem 2014; 79:10786-800. [DOI: 10.1021/jo5016745] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rima Lahiri
- Department
of Chemistry, Indian Institute of Technology Kanpur Kanpur 208016, India
| | - Ashokkumar Palanivel
- Department
of Chemistry, Indian Institute of Technology Kanpur Kanpur 208016, India
| | - Sudhir A. Kulkarni
- VLife Sciences Technologies Pvt. Ltd., second
Floor Anaahat, Plot No. 5, Ram Indu Park, Baner Road, Pune 411045, India
| | - Yashwant D. Vankar
- Department
of Chemistry, Indian Institute of Technology Kanpur Kanpur 208016, India
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Salem SM, Kancharla P, Florova G, Gupta S, Lu W, Reynolds KA. Elucidation of final steps of the marineosins biosynthetic pathway through identification and characterization of the corresponding gene cluster. J Am Chem Soc 2014; 136:4565-74. [PMID: 24575817 PMCID: PMC3985843 DOI: 10.1021/ja411544w] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
The
marine Streptomyces sp. CNQ-617 produces two
diastereomers, marineosins A and B. These are structurally related
to alkyl prodiginines, but with a more complex cyclization and an
unusual spiroaminal skeleton. We report the identification of the mar biosynthetic gene cluster and demonstrate production
of marineosins through heterologous expression in a S. venezuelae host named JND2. The mar cluster shares the same
gene organization and has high homology to the genes of the red cluster (which directs the biosynthesis of undecylprodiginine)
but contains an additional gene, named marA. Replacement
of marA in the JND2 strain leads to the accumulation
of premarineosin, which is identical to marineosin with the exception
that the middle pyrrole (Ring B) has not been reduced. The final step
of the marineosin pathway is thus a MarA catalyzed reduction of this
ring. Replacement of marG (a homologue of redG that directs undecylprodiginine cyclization to give
streptorubin B) in the JND2 strain leads to the loss of all spiroaminal
products and the accumulation of 23-hydroxyundecylprodiginine and
a shunt product, 23-ketoundecylprodiginine. MarG thus catalyzes the
penultimate step of the marineosin pathway catalyzing conversion of
23-hydroxyundecylprodiginine to premarineosin. The preceding steps
of the biosynthetic marineosin pathway likely mirror that in the red-directed biosynthetic process, with the exception of
the introduction of the hydroxyl functionality required for spiroaminal
formation. This work presents the first experimentally supported scheme
for biosynthesis of marineosin and provides a new biologically active
molecule, premarineosin.
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Affiliation(s)
- Shaimaa M Salem
- Department of Chemistry, Portland State University , Portland, Oregon, 97201-3203, United States
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Awan SI, Werz DB. Syntheses of 1,2-annulated and 1-spiroannulated carbohydrate derivatives: Recent developments. Bioorg Med Chem 2012; 20:1846-56. [DOI: 10.1016/j.bmc.2011.10.089] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Revised: 10/20/2011] [Accepted: 10/30/2011] [Indexed: 01/09/2023]
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12
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Lee SJ, Heo IJ, Cho CW. One-Pot Synthesis of Five-, Six-, and Seven-Membered Lactams via Bu3SnH-Mediated Reductive Cyclization of Azido Amides. B KOREAN CHEM SOC 2012. [DOI: 10.5012/bkcs.2012.33.2.739] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Heo IJ, Lee SJ, Cho CW. Direct Lactamization of Azido Amides via Staudinger-Type Reductive Cyclization. B KOREAN CHEM SOC 2012. [DOI: 10.5012/bkcs.2012.33.1.333] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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