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Deng M, Yang J, Kong Z, Li Y, Wang Q, Liu H, Deng SZ, Li N. Manganese/Enzyme Sequential Catalytic Pathway for the Production of Optically Active γ-Functionalized Alcohols. J Org Chem 2024; 89:9103-9109. [PMID: 38842047 DOI: 10.1021/acs.joc.4c00776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2024]
Abstract
A brief, practical catalytic process for the production of optically active γ-functionalized alcohols from relevant alkenes has been developed by using a robust Mn(III)/air/(Me2SiH)2O catalytic system combined with lipase-catalyzed kinetic resolution. This approach demonstrates exceptional tolerance toward proximal functional groups present on alkenes, enabling the achievement of high yields and exclusive enantioselectivity. Under this sequential catalytic system, the chiral alkene precursors can also be converted into γ-functionalized alcohols and related acetates as separable single enantiomers.
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Affiliation(s)
- Meng Deng
- College of Food and Drug, Luoyang Normal University, Luoyang, Henan Province 471934, China
| | - Jiaqi Yang
- College of Food and Drug, Luoyang Normal University, Luoyang, Henan Province 471934, China
| | - Zhiyi Kong
- College of Food and Drug, Luoyang Normal University, Luoyang, Henan Province 471934, China
| | - Yaning Li
- College of Food and Drug, Luoyang Normal University, Luoyang, Henan Province 471934, China
| | - Quanpeng Wang
- College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang, Henan Province 471934, China
| | - Huan Liu
- College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang, Henan Province 471023, China
| | - Shu-Zhen Deng
- College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang, Henan Province 471023, China
| | - Nan Li
- College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang, Henan Province 471934, China
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2
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Šegina J, Ciber L, Brodnik H, Požgan F, Svete J, Štefane B, Grošelj U. Synthesis of Six-Membered N-Heterocyclic Carbene Precursors Based on Camphor. Molecules 2023; 28:7973. [PMID: 38138463 PMCID: PMC10745536 DOI: 10.3390/molecules28247973] [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: 11/13/2023] [Revised: 11/29/2023] [Accepted: 12/04/2023] [Indexed: 12/24/2023] Open
Abstract
The endo- and exo-N-heterocyclic carbene precursors based on camphor were prepared diastereoselectively in five synthetic steps starting from (1S)-(+)-ketopinic acid. The obtained N-heterocyclic carbene precursors were investigated in an asymmetric benzoin reaction. All new compounds were fully characterized, and the absolute configurations were determined via X-ray diffraction and NOESY measurements.
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Affiliation(s)
| | | | | | | | | | | | - Uroš Grošelj
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna Pot 113, 1000 Ljubljana, Slovenia; (J.Š.); (L.C.); (F.P.); (J.S.); (B.Š.)
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3
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Lui NM, Collum DB. Sodiated Oppolzer Enolates: Solution Structures, Mechanism of Alkylation, and Origin of Stereoselectivity. Org Chem Front 2023; 10:4750-4757. [PMID: 38144519 PMCID: PMC10746328 DOI: 10.1039/d3qo01021j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2023]
Abstract
NMR spectroscopic studies reveal camphorsultam-derived sodium enolates known as Oppolzer enolates reside as monomers in neat THF and THF/HMPA solutions and as dimers in toluene when solvated by N,N,N',N'-tetramethylethylenediamine (TMEDA) and N,N,N',N'',N''-pentamethyldiethylenediamine (PMDTA). Density functional theory (DFT) computations attest to the solvation numbers. Rate studies show analogy with previously studied lithiated Oppolzer enolates in which alkylation occurs through non-chelated solvent-separated ion pairs. The origins of the selectivity trace to transition structures in which the alkylating agent is guided to the exo face of the camphor owing to stereoelectronic preferences imparted by the sultam sulfonyl moiety. Marked secondary-shell solvation effects are gleaned from the rate studies.
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Affiliation(s)
- Nathan M Lui
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, United States
| | - David B Collum
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, United States
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4
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Lui NM, MacMillan SN, Collum DB. Lithiated Oppolzer Enolates: Solution Structures, Mechanism of Alkylation, and Origin of Stereoselectivity. J Am Chem Soc 2022; 144:23379-23395. [PMID: 36534055 PMCID: PMC10071589 DOI: 10.1021/jacs.2c09341] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Camphorsultam-based lithium enolates referred to colloquially as Oppolzer enolates are examined spectroscopically, crystallographically, kinetically, and computationally to ascertain the mechanism of alkylation and the origin of the stereoselectivity. Solvent- and substrate-dependent structures include tetramers for alkyl-substituted enolates in toluene, unsymmetric dimers for aryl-substituted enolates in toluene, substrate-independent symmetric dimers in THF and THF/toluene mixtures, HMPA-bridged trisolvated dimers at low HMPA concentrations, and disolvated monomers for the aryl-substituted enolates at elevated HMPA concentrations. Extensive analyses of the stereochemistry of aggregation are included. Rate studies for reaction with allyl bromide implicate an HMPA-solvated ion pair with a +Li(HMPA)4 counterion. Dependencies on toluene and THF are attributed to exclusively secondary-shell (medium) effects. Aided by density functional theory (DFT) computations, a stereochemical model is presented in which neither chelates nor the lithium gegenion serves roles. The stereoselectivity stems from the chirality within the sultam ring and not the camphor skeletal core.
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Affiliation(s)
- Nathan M Lui
- Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University Ithaca, New York 14853-1301, United States
| | - Samantha N MacMillan
- Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University Ithaca, New York 14853-1301, United States
| | - David B Collum
- Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University Ithaca, New York 14853-1301, United States
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5
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Liang Y, Zhang Y, Li M, Meng Z, Gong S, Du W, Yang Y, Wang Z, Wang S. A camphor-based fluorescent probe with high selectivity and sensitivity for formaldehyde detection in real food samples and living zebrafish. Microchem J 2022. [DOI: 10.1016/j.microc.2022.107305] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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6
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Sampath M, Jayaraman SR, Eda VR, Potham R, Budhdev RR, Sen S, Bandichhor R, Oruganti S. Enantioselective Synthesis of the Chiral Pyrrolidine Fragment of Upadacitinib via Chiral Auxiliary Directed Diastereoselective 1,3-Dipolar Cycloaddition. Org Process Res Dev 2022. [DOI: 10.1021/acs.oprd.1c00454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Magesh Sampath
- Dr. Reddy’s Institute of Life Sciences, University of Hyderabad Campus, Gachibowli, Hyderabad 500 046, Telangana, India
| | - Sembian Ruso Jayaraman
- Dr. Reddy’s Institute of Life Sciences, University of Hyderabad Campus, Gachibowli, Hyderabad 500 046, Telangana, India
| | - Vishnuvardhan Reddy Eda
- Dr. Reddy’s Institute of Life Sciences, University of Hyderabad Campus, Gachibowli, Hyderabad 500 046, Telangana, India
| | - Rajendar Potham
- Dr. Reddy’s Institute of Life Sciences, University of Hyderabad Campus, Gachibowli, Hyderabad 500 046, Telangana, India
| | - Rajeev Rehani Budhdev
- Integrated Product Development Organization, Dr. Reddy’s Laboratories, Bachupally, Qutbullapur, Hyderabad 500 090, Telangana, India
| | - Saikat Sen
- Dr. Reddy’s Institute of Life Sciences, University of Hyderabad Campus, Gachibowli, Hyderabad 500 046, Telangana, India
| | - Rakeshwar Bandichhor
- Integrated Product Development Organization, Dr. Reddy’s Laboratories, Bachupally, Qutbullapur, Hyderabad 500 090, Telangana, India
| | - Srinivas Oruganti
- Dr. Reddy’s Institute of Life Sciences, University of Hyderabad Campus, Gachibowli, Hyderabad 500 046, Telangana, India
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7
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Bains AK, Biswas A, Adhikari D. Nickel‐Catalyzed Selective Synthesis of α‐Alkylated Ketones via Dehydrogenative Cross‐Coupling of Primary and Secondary Alcohols. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202101077] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Amreen K Bains
- Department of Chemical Sciences Indian Institute of Science Education and Research (IISER)-Mohali, SAS Nagar Punjab 140306 India
| | - Ayanangshu Biswas
- Department of Chemical Sciences Indian Institute of Science Education and Research (IISER)-Mohali, SAS Nagar Punjab 140306 India
| | - Debashis Adhikari
- Department of Chemical Sciences Indian Institute of Science Education and Research (IISER)-Mohali, SAS Nagar Punjab 140306 India
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8
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Liang Y, Zhang Y, Li M, Meng Z, Gao Y, Yin J, Yang Y, Wang Z, Wang S. A highly effective "turn-on" camphor-based fluorescent probe for rapid and sensitive detection and its biological imaging of Fe 2. Anal Bioanal Chem 2021; 413:6267-6277. [PMID: 34355255 DOI: 10.1007/s00216-021-03581-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 07/12/2021] [Accepted: 07/26/2021] [Indexed: 01/17/2023]
Abstract
In this work, a novel fluorescent probe CBO was synthesized for detecting Fe2+ using the natural monoterpenketone camphor as the starting material. The probe CBO displayed turn-on fluorescence to Fe2+ accompanied by the solution change from colorless to green. As expected, there was an excellent linear relationship between the fluorescence intensity of probe CBO and the concentration of Fe2+ (0-20 μM), and the detection limit was as low as 1.56×10-8 M. In particular, CBO could selectively sense Fe2+ more than other analytes (Fe3+ included) through the N-oxide strategy, and quickly responded to Fe2+ (60 s) over a wide pH (4-14) range. Additionally, based on the rapid fluorescence response of CBO to Fe2+, a simple test strip-based detector was designed for boosting practical applicability. The probe CBO had been successfully applied to the fluorescence imaging of Fe2+ in onion cells and living zebrafish. The probe CBO was a powerful tool of detecting Fe2+ level in organisms, which was of significance to understand the role of Fe2+ in Fe2+-related physical processes and diseases.
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Affiliation(s)
- Yueyin Liang
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, College of Light Industry and Food, Nanjing Forestry University, Nanjing, 210037, China
| | - Yan Zhang
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, College of Light Industry and Food, Nanjing Forestry University, Nanjing, 210037, China
| | - Mingxin Li
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, College of Light Industry and Food, Nanjing Forestry University, Nanjing, 210037, China
| | - Zhiyuan Meng
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, College of Light Industry and Food, Nanjing Forestry University, Nanjing, 210037, China
| | - Yu Gao
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, College of Light Industry and Food, Nanjing Forestry University, Nanjing, 210037, China
| | - Jie Yin
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, College of Light Industry and Food, Nanjing Forestry University, Nanjing, 210037, China
| | - Yiqin Yang
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, College of Light Industry and Food, Nanjing Forestry University, Nanjing, 210037, China
| | - Zhonglong Wang
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, College of Light Industry and Food, Nanjing Forestry University, Nanjing, 210037, China.
| | - Shifa Wang
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, College of Light Industry and Food, Nanjing Forestry University, Nanjing, 210037, China.
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9
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Nagatomo M, Inoue M. Convergent Assembly of Highly Oxygenated Natural Products Enabled by Intermolecular Radical Reactions. Acc Chem Res 2021; 54:595-604. [PMID: 33406830 DOI: 10.1021/acs.accounts.0c00792] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Natural products with a high ratio of sp3-hybridized atoms and oxygen-substituted stereogenic centers represent privileged structures for the development of pharmaceuticals and chemical probes. The multiple oxygen functionalities of these natural products endow their potent and selective biological activities, although they significantly heighten the challenge of their chemical assemblies. We focused on developing efficient strategies for the total syntheses of this biologically and chemically important class of molecules. A convergent strategy is more advantageous than a linear strategy for designing a shorter synthetic route because a convergent strategy enables direct coupling of functionalized fragments whereas a linear strategy involves stepwise construction of a molecule from its terminus. Radical reactions are preferred over polar reactions for the coupling of heavily functionalized and sp3-rich fragments, as they allow for C(sp3)-C(sp3) coupling without damaging diverse polar functional groups. With these considerations in mind, we designed radical-based convergent strategies for assembling highly oxygenated natural products. Here we summarize the concise total syntheses of asimicin (1, antibiotic activity), 1-hydroxytaxinine (2, cytotoxicity), polyoxins (3, antifungal activity), and hikizimycin (4, anthelmintic activity) as representative examples. Retrosynthetic disconnection at the central part of these molecules produces highly substituted α-alkoxy radicals as synthons. In the synthetic direction, the α-alkoxy radicals were generated from the corresponding α-alkoxyacyl tellurides in a unified fashion, and then utilized for four distinct coupling reactions. Formation of the Et radical from Et3B and O2 homolytically cleaves the C-Te bond of α-alkoxyacyl telluride, and the facile expulsion of carbon monoxide from the acyl radical leads to the α-alkoxy radical. Dimerization of the stabilized α-alkoxy radical resulted in the core structure of 1 with 10 contiguous stereocenters. The coupling adduct was derivatized to 1 through the attachment of two different carbon chains (17 steps as the longest linear sequence). Alternatively, intermolecular addition reactions of the α-alkoxy radicals to electron-deficient C═C, C═N, and C═O bonds, followed by Et3B-mediated radical termination, led to the core structures of 2, 3, and 4, respectively. Intermolecular coupling between the α-alkoxy radical and the cyclohexenone derivative and intramolecular pinacol coupling gave rise to the 6/8/6-fused ring system of 2, which was transformed to 2 (26 steps). The two amino acid moieties of 3 were prepared by combining the α-alkoxy radical and the oxime and were then condensed to complete the synthesis of 3 (11 steps). Furthermore, a combination of α-alkoxyacyl telluride and Et3B/O2 realized a novel addition reaction of α-alkoxy radicals to aldehydes. This method was incorporated in the construction of the core 4-amino-5-deoxyundecose with 10 contiguous stereocenters, which was fabricated with two appendage structures to deliver 4. The four total syntheses described here demonstrate the versatility and robustness of intermolecular radical reactions. These syntheses will also provide new insights for retrosynthetic analyses in the field of organic chemistry and streamline synthetic routes to various bioactive natural products with multiple oxygen functionalities.
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Affiliation(s)
- Masanori Nagatomo
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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10
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Jun JJ, Xie X. Implementation of Diverse Synthetic and Strategic Approaches to Biologically Active Sulfamides. ChemistrySelect 2021. [DOI: 10.1002/slct.202004765] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Jaden J. Jun
- Department of Pharmaceutical Sciences and Computational Chemical Genomics Screening Center School of Pharmacy 335 Sutherland Drive 206 Salk Pavilion University of Pittsburgh Pittsburgh PA15261 USA
- NIH National Center of Excellence for Computational Drug Abuse Research
- Drug Discovery Institute
| | - Xiang‐Qun Xie
- Department of Pharmaceutical Sciences and Computational Chemical Genomics Screening Center School of Pharmacy 335 Sutherland Drive 206 Salk Pavilion University of Pittsburgh Pittsburgh PA15261 USA
- NIH National Center of Excellence for Computational Drug Abuse Research
- Drug Discovery Institute
- Departments of Computational Biology and Structural Biology Director of CCGS and NIDA CDAR Centers School of Medicine University of Pittsburgh Pittsburgh Pennsylvania 15261 United States
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11
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Nosova NV, Sokolov AA, Gein ON, Gein VL, Yankin AN, Danilov SE, Dmitriev MV. Synthesis and Analgesic Activity of N,6-Diaryl-4-hydroxy-4-methyl-2-oxocyclohexane-1-carboxamides and Their Dehydration Products. RUSS J GEN CHEM+ 2020. [DOI: 10.1134/s1070363220090017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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12
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DABCO‐Catalyzed
the Synthesis of Densely Functionalized Cyclohexanones in a Benign Manner. B KOREAN CHEM SOC 2020. [DOI: 10.1002/bkcs.12067] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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13
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Ričko S, Požgan F, Štefane B, Svete J, Golobič A, Grošelj U. Stereodivergent Synthesis of Camphor-Derived Diamines and Their Application as Thiourea Organocatalysts. Molecules 2020; 25:molecules25132978. [PMID: 32610466 PMCID: PMC7412124 DOI: 10.3390/molecules25132978] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 06/26/2020] [Accepted: 06/27/2020] [Indexed: 11/16/2022] Open
Abstract
A series of 18 regio- and stereo-chemically diverse chiral non-racemic 1,2-, 1,3-, and 1,4-diamines have been synthesized from commercial (1S)-(+)-ketopinic acid and (1S)-(+)-10-camphorsulfonic acid. The structures of the diamines are all based on the d-(+)-camphor scaffold and feature isomeric diversity in terms of regioisomeric attachment of the primary and the tertiary amine function and the exo/endo-isomerism. Diamines were transformed into the corresponding noncovalent bifunctional thiourea organocatalysts, which have been evaluated for catalytic activity in the conjugative addition of 1,3-dicarbonyl nucleophiles (dimethyl malonate, acetylacetone, and dibenzoylmethane) to trans-β-nitrostyrene. The highest enantioselectivity was achieved in the reaction with acetylacetone as nucleophile using endo-1,3-diamine derived catalyst 52 (91.5:8.5 er). All new organocatalysts 48-63 have been fully characterized. The structures and the absolute configurations of eight intermediates and thiourea derivative 52 were also determined by X-ray diffraction.
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Qian LL, Min XT, Hu YC, Shen BX, Yang SN, Wan B, Chen QA. Ruthenium(ii)-catalyzed intermolecular annulation of alkenyl sulfonamides with alkynes: access to bicyclic sultams. Chem Commun (Camb) 2020; 56:2614-2617. [PMID: 32016279 DOI: 10.1039/d0cc00093k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A ruthenium-catalyzed allylic C(sp3)-H activation strategy has been employed to develop an intermolecular coupling of alkenyl sulfonamides with alkynes. This protocol features the diastereoselective construction of [3.3.0] and [4.3.0] bicyclic sultams in one step.
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Affiliation(s)
- Lei-Lei Qian
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China. and University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Xiang-Ting Min
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China. and University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Yan-Cheng Hu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
| | - Bing-Xue Shen
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China. and University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Sa-Na Yang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China. and University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Boshun Wan
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
| | - Qing-An Chen
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
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Shimada K, Aoyagi S, Takikawa Y. Formation of a Sterically Crowded 1,6,6αλ 4-Triselenapentalene and 4 H-Selenopyran-4-selones Fused with Two Bornane Skeletons Through the Reaction of d-Camphor p-Toluenesulfonylhydrazone With a Base and Elemental Selenium. Nat Prod Commun 2020. [DOI: 10.1177/1934578x19896686] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Reaction of d-camphor p-toluenesulfonylhydrazone with t-butoxide and elemental selenium in dimethylformamide at an elevated temperature afforded a stable compound having a unique 1,6,6αλ4-triselenapentalene ring and 4 H-selenopyran-4-selones along with dialkenyl diselenide, dibornylenes, and 1,2,5-triselenepin, and the structural confirmation of these products were carried out by X-ray crystallographic analysis. The sterically crowded 1,6,6aλ4-triselenapentalene ring fused with two bornane sleketons was stable enough under aerobic exposure and was inactive toward sodium borohydride reduction but was converted into 1,2-diselenole derivative through m-chloroperbenzoic acid oxidation.
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Affiliation(s)
- Kazuaki Shimada
- Department of Chemistry and Biosciences, Faculty of Science and Engineering, Iwate University, Morioka, Japan
| | - Shigenobu Aoyagi
- Department of Chemistry and Biosciences, Faculty of Science and Engineering, Iwate University, Morioka, Japan
| | - Yuji Takikawa
- Department of Chemistry and Biosciences, Faculty of Science and Engineering, Iwate University, Morioka, Japan
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Shimada K, Fukuma K, Korenaga T. Synthesis of Functionalized Chiral Imidazole Derivatives Based on a Bornane Skeleton Bearing a Sterically Crowded Spirocyclic Substituent at the C-3 Position. Nat Prod Commun 2019. [DOI: 10.1177/1934578x19878930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
10-Imidazolylbornane-2-one bearing a sterically crowded spirocyclic substituent at the C-3 position was prepared from d-camphor through the procedure involving the formation of 10-bromobornane-2-thiones or 10-iodobornane-2-thiones and the subsequent conversion into the corresponding 10-imidazolylbornane-2-thiones followed by an efficient oxidative S-O exchange via thione S-oxides.
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Affiliation(s)
- Kazuaki Shimada
- Department of Chemistry and Biosciences, Faculty of Science and Engineering, Iwate University, Morioka, Japan
| | - Kodai Fukuma
- Department of Chemistry and Biosciences, Faculty of Science and Engineering, Iwate University, Morioka, Japan
| | - Toshinobu Korenaga
- Department of Chemistry and Biosciences, Faculty of Science and Engineering, Iwate University, Morioka, Japan
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17
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Stereoselective synthesis of novel functionalized cyclohexanone derivatives via the condensation of aromatic aldehydes with acetoacetamide and the influence of the ortho-effect and autocondensation. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.05.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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18
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Behaviour of Tetrabenazine in Acid Medium: Reassessment and Impact on Formulation. Pharmaceutics 2019; 11:pharmaceutics11010044. [PMID: 30669539 PMCID: PMC6359103 DOI: 10.3390/pharmaceutics11010044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 01/16/2019] [Accepted: 01/17/2019] [Indexed: 11/21/2022] Open
Abstract
Thorough studies of previous analytical stress data of tetrabenazine, a dopamine depleting agent, showed a potential susceptibility to acidic conditions. Hence, the behavior of tetrabenazine acidic solutions was studied by LC-MS and NMR spectroscopy. Reverse-phase LC-MS analysis of tetrabenazine acidic aqueous solutions consistently showed a main lipophilic impurity in a proportion of 15 to 20%. NMR spectroscopy studies did not allow to completely ascertain its structure. However, we hypothesize an interconversion of trans-tetrabenazine with its unstable cis isomer via an open isoquinolinium intermediate. Evaluation of tetrabenazine integrity in orodispersible films was reassessed in light of these observations after formulation and during stability study. Even if interconversion of trans-tetrabenazine with its cis isomer was observed in orodispersible films containing tetrabenazine, this phenomenon seems not to have any consequences for the overall tetrabenazine bioavailability.
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Wern M, Ortmeyer J, Josephs P, Schneider T, Neuba A, Henkel G, Schindler S. Syntheses, characterization, and reactivity of copper complexes with camphor-like tetramethylguanidine ligands. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.09.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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20
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Subramanian P, Kaliappan KP. Transition-Metal-Free Multicomponent Approach to Stereoenriched Cyclopentyl-isoxazoles through C-C Bond Cleavage. Chem Asian J 2018; 13:2031-2039. [PMID: 29920954 DOI: 10.1002/asia.201800608] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 06/11/2018] [Indexed: 01/01/2023]
Abstract
An efficient multicomponent reaction for the synthesis of stereoenriched cyclopentyl-isoxazoles from camphor-derived α-oximes, alkynes, and MeOH is reported. Our method involved a series of cascade transformations, including the in situ generation of an IIII catalyst, which catalyzed the addition of MeOH to a sterically hindered ketone. Oxidation of the oxime, and rearrangement of the α-hydroxyiminium ion generated a nitrile oxide in situ, which, upon [3+2] cycloaddition reaction with an alkyne, delivered the regioselective product. This reaction was very selective for the syn-oxime. This multicomponent approach was also extended to the synthesis of a new glycoconjugate, camphoric ester-isoxazole C-galactoside.
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Affiliation(s)
- Parthasarathi Subramanian
- Department of Chemistry, Indian Institute of Technology Bombay, Main Gate Road, Powai, Mumbai, 400076, India
| | - Krishna P Kaliappan
- Department of Chemistry, Indian Institute of Technology Bombay, Main Gate Road, Powai, Mumbai, 400076, India
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21
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Ortmeyer J, Schneider T, Flörke U, Henkel G, Neuba A. A Powerful Synthesis Strategy of Novel Non-Symmetrical Camphor-Based Guanidines. ChemistrySelect 2018. [DOI: 10.1002/slct.201800425] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jochen Ortmeyer
- Fakultät für Naturwissenschaften; Department Chemie; Fachbereich Anorganische und Analytische Chemie; Universität Paderborn; Warburger Str. 100 33098 Paderborn Deutschland
| | - Tobias Schneider
- Fakultät für Naturwissenschaften; Department Chemie; Fachbereich Anorganische und Analytische Chemie; Universität Paderborn; Warburger Str. 100 33098 Paderborn Deutschland
| | - Ulrich Flörke
- Fakultät für Naturwissenschaften; Department Chemie; Fachbereich Anorganische und Analytische Chemie; Universität Paderborn; Warburger Str. 100 33098 Paderborn Deutschland
| | - Gerald Henkel
- Fakultät für Naturwissenschaften; Department Chemie; Fachbereich Anorganische und Analytische Chemie; Universität Paderborn; Warburger Str. 100 33098 Paderborn Deutschland
| | - Adam Neuba
- Fakultät für Naturwissenschaften; Department Chemie; Fachbereich Anorganische und Analytische Chemie; Universität Paderborn; Warburger Str. 100 33098 Paderborn Deutschland
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22
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Heterocyclic Chiral Auxiliaries in Total Synthesis of Natural Products. TOPICS IN HETEROCYCLIC CHEMISTRY 2018. [DOI: 10.1007/7081_2018_26] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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23
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Fujino H, Nagatomo M, Paudel A, Panthee S, Hamamoto H, Sekimizu K, Inoue M. Unified Total Synthesis of Polyoxins J, L, and Fluorinated Analogues on the Basis of Decarbonylative Radical Coupling Reactions. Angew Chem Int Ed Engl 2017; 56:11865-11869. [PMID: 28727238 DOI: 10.1002/anie.201706671] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Indexed: 01/22/2023]
Abstract
Polyoxins J (1 a) and L (1 b) are important nucleoside antibiotics. The complex and densely functionalized dipeptide structures of 1 a and 1 b contain thymine and uracil nucleobases, respectively. Herein we report the unified total synthesis of 1 a, 1 b, and their artificial analogues 1 c and 1 d with trifluorothymine and fluorouracil structures. Decarbonylative radical coupling between α-alkoxyacyl tellurides and a chiral glyoxylic oxime ether led to chemo- and stereoselective construction of the ribonucleoside α-amino acid structures of 1 a-d without damaging the preinstalled nucleobases. The high applicability of the radical-based methodology was further demonstrated by preparation of the trihydroxynorvaline moiety of 1 a-d. The two amino acid fragments were connected and elaborated into 1 a-d (longest linear sequence: 11 steps). Compounds 1 a and 1 b assembled in this way exhibited potent activity against true fungi, while only 1 d was active against Gram-positive bacteria.
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Affiliation(s)
- Haruka Fujino
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Masanori Nagatomo
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Atmika Paudel
- Teikyo University, Institute of Medical Mycology, 359 Otsuka, Hachioji, Tokyo, 192-0395, Japan
| | - Suresh Panthee
- Teikyo University, Institute of Medical Mycology, 359 Otsuka, Hachioji, Tokyo, 192-0395, Japan
| | - Hiroshi Hamamoto
- Teikyo University, Institute of Medical Mycology, 359 Otsuka, Hachioji, Tokyo, 192-0395, Japan
| | - Kazuhisa Sekimizu
- Teikyo University, Institute of Medical Mycology, 359 Otsuka, Hachioji, Tokyo, 192-0395, Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
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24
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Fujino H, Nagatomo M, Paudel A, Panthee S, Hamamoto H, Sekimizu K, Inoue M. Unified Total Synthesis of Polyoxins J, L, and Fluorinated Analogues on the Basis of Decarbonylative Radical Coupling Reactions. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201706671] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Haruka Fujino
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Masanori Nagatomo
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Atmika Paudel
- Teikyo University; Institute of Medical Mycology; 359 Otsuka, Hachioji Tokyo 192-0395 Japan
| | - Suresh Panthee
- Teikyo University; Institute of Medical Mycology; 359 Otsuka, Hachioji Tokyo 192-0395 Japan
| | - Hiroshi Hamamoto
- Teikyo University; Institute of Medical Mycology; 359 Otsuka, Hachioji Tokyo 192-0395 Japan
| | - Kazuhisa Sekimizu
- Teikyo University; Institute of Medical Mycology; 359 Otsuka, Hachioji Tokyo 192-0395 Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; Hongo, Bunkyo-ku Tokyo 113-0033 Japan
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25
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Xie L, Ma H, Li J, Yu Y, Qin Z, Fu B. Ni(ii)-Catalyzed enantioselective Mukaiyama–Mannich reaction between silyl enol ethers and cyclic N-sulfonyl α-ketiminoesters. Org Chem Front 2017. [DOI: 10.1039/c7qo00370f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first Ni(ii)-catalyzed Mukaiyama–Mannich reaction of cyclic N-sulfonyl α-ketiminoesters with silyl enol ethers was realized and provided enantioenriched benzofused sultams containing a quaternary α-amino ester.
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Affiliation(s)
- Lei Xie
- Department of Applied Chemistry
- China Agricultural University
- Beijing 100193
- China
| | - Hongli Ma
- Department of Applied Chemistry
- China Agricultural University
- Beijing 100193
- China
| | - Jiaqi Li
- Department of Applied Chemistry
- China Agricultural University
- Beijing 100193
- China
| | - Yuan Yu
- Department of Applied Chemistry
- China Agricultural University
- Beijing 100193
- China
| | - Zhaohai Qin
- Department of Applied Chemistry
- China Agricultural University
- Beijing 100193
- China
| | - Bin Fu
- Department of Applied Chemistry
- China Agricultural University
- Beijing 100193
- China
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26
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Piątek A, Chapuis C. Grignard1,4-Additions to para-Substituted (2 R)- N-Cinnamoylbornane-10,2-sultam Derivatives: Revised Configuration for the N,OAc-Keteneacetal Formation in the Presence of Cu(I). Helv Chim Acta 2016. [DOI: 10.1002/hlca.201500521] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Anna Piątek
- Department of Chemistry; University of Warsaw; Pasteura 1 PL-02-093 Warsaw
| | - Christian Chapuis
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 PL-01-224 Warsaw
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27
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Fu JG, Shan YF, Sun WB, Lin GQ, Sun BF. An asymmetric approach to bicyclo[2.2.1]heptane-1-carboxylates via a formal [4 + 2] cycloaddition reaction enabled by organocatalysis. Org Biomol Chem 2016; 14:5229-32. [PMID: 27219468 DOI: 10.1039/c6ob00814c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An organocatalytic formal [4 + 2] cycloaddition reaction has been realized that permits rapid access to a wide range of bicyclo[2.2.1]heptane-1-carboxylates in a highly enantioselective manner from simple starting materials under mild and operationally simple conditions.
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Affiliation(s)
- Jian-Guo Fu
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, 345 Lingling Road, Shanghai 200032, China.
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28
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Zhang L, Zhu L, Yang J, Luo J, Hong R. Stereoselective α-Hydroxylation of Amides Using Oppolzer's Sultam as Chiral Auxiliary. J Org Chem 2016; 81:3890-900. [PMID: 27035800 DOI: 10.1021/acs.joc.6b00068] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An Oppolzer's sultam-based highly stereoselective α-hydroxylation of amides was developed to deliver the desired products in good yield and excellent diastereoselectivity (>20/1). The generally crystalline products and the recyclability of the chiral auxiliary illustrate the practicability and scalability of the current approach.
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Affiliation(s)
- Lumin Zhang
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences , 345 Lingling Road, Shanghai 200032, P. R. China
| | - Lili Zhu
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences , 345 Lingling Road, Shanghai 200032, P. R. China
| | - Jun Yang
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences , 345 Lingling Road, Shanghai 200032, P. R. China
| | - Jisheng Luo
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences , 345 Lingling Road, Shanghai 200032, P. R. China
| | - Ran Hong
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences , 345 Lingling Road, Shanghai 200032, P. R. China
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29
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Pham MV, Cramer N. Enantioselective Access to Spirocyclic Sultams by Chiral Cpx
-Rhodium(III)-Catalyzed Annulations. Chemistry 2016; 22:2270-3. [DOI: 10.1002/chem.201504998] [Citation(s) in RCA: 116] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Indexed: 11/10/2022]
Affiliation(s)
- Manh V. Pham
- 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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30
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Nakamura S, Sano M, Toda A, Nakane D, Masuda H. Organocatalytic Enantioselective Decarboxylative Reaction of Malonic Acid Half Thioesters with CyclicN-Sulfonyl Ketimines by UsingN-Heteroarenesulfonyl Cinchona Alkaloid Amides. Chemistry 2015; 21:3929-32. [DOI: 10.1002/chem.201406270] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Indexed: 11/09/2022]
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31
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Nagatomo M, Nishiyama H, Fujino H, Inoue M. Decarbonylative Radical Coupling of α-Aminoacyl Tellurides: Single-Step Preparation of γ-Amino and α,β-Diamino Acids and Rapid Synthesis of Gabapentin and Manzacidin A. Angew Chem Int Ed Engl 2014; 54:1537-41. [DOI: 10.1002/anie.201410186] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Indexed: 11/09/2022]
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32
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Nagatomo M, Nishiyama H, Fujino H, Inoue M. Decarbonylative Radical Coupling of α-Aminoacyl Tellurides: Single-Step Preparation of γ-Amino and α,β-Diamino Acids and Rapid Synthesis of Gabapentin and Manzacidin A. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201410186] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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33
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Ričko S, Golobič A, Svete J, Stanovnik B, Grošelj U. Synthesis of novel camphor-derived bifunctional thiourea organocatalysts. Chirality 2014; 27:39-52. [PMID: 25283890 DOI: 10.1002/chir.22386] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Accepted: 08/13/2014] [Indexed: 11/06/2022]
Abstract
Synthesis and catalyst performance of 2,3- (types and ) and 2,8-disubstituted (type ) thiourea bifunctional organocatalysts was attempted. The synthesis of catalyst of type has, so far, not been realized, while catalysts of type , i.e., the 2,3-exo- and the 2-endo-3-exo-thiourea catalysts, were prepared in six steps starting from (+)-camphor. The catalysts of type were prepared from (+)-camphor in eight steps. All the potential catalysts as well as most of the intermediate products were carefully structurally characterized. The thiourea bifunctional organocatalysts were tested in a model reaction of Michael addition of dimethyl malonate to trans-β-nitrostyrene.
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Affiliation(s)
- Sebastijan Ričko
- University of Ljubljana, Faculty of Chemistry and Chemical Technology, Ljubljana, Slovenia
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34
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Heravi MM, Zadsirjan V. Recent advances in the application of the Oppolzer camphorsultam as a chiral auxiliary. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.tetasy.2014.07.001] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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35
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Zhao Y, Sakai N, Matile S. Enolate chemistry with anion–π interactions. Nat Commun 2014; 5:3911. [DOI: 10.1038/ncomms4911] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2014] [Accepted: 04/17/2014] [Indexed: 12/12/2022] Open
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36
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Abstract
A short total synthesis of (-)-kainic acid has been developed involving a novel diastereofacial differentiating Cu-catalyzed Michael addition-cyclization reaction, which provided access to a chiral pyrroline in a highly stereoselective manner. The chiral pyrroline was converted to (-)-kainic acid via the stereoselective 1,4-reduction of the pyrroline double bond in three steps.
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Affiliation(s)
- Kentaro Oe
- Graduate School of Science, Osaka City University , Sugimoto, Sumiyoshi, Osaka 558-8585, Japan
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37
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Ueda M. Radical Addition-Initiated Domino Reactions of Conjugated Oxime Ethers. Chem Pharm Bull (Tokyo) 2014; 62:845-55. [DOI: 10.1248/cpb.c14-00388] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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38
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Majumdar KC, Sinha B. Coinage metals (Cu, Ag and Au) in the synthesis of natural products. RSC Adv 2014. [DOI: 10.1039/c3ra44336a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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39
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Negishi EI, Xu S. Syntheses of Chiral Heterocyclic Compounds via Zirconium-Catalyzed Asymmetric Carboalumination of Alkynes (ZACA Reaction). HETEROCYCLES 2014. [DOI: 10.3987/rev-13-sr(s)5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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40
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Garduño-Castro MH, Hernández-Rodríguez M. Application of acyclic chiral auxiliaries on alkylation reactions. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2013.10.148] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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41
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Stoyanova MP, Shivachev BL, Nikolova RP, Dimitrov V. Highly efficient synthesis of chiral aminoalcohols and aminodiols with camphane skeleton. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.tetasy.2013.08.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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42
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Nash A, Soheili A, Tambar UK. Stereoselective Synthesis of Functionalized Cyclic Amino Acid Derivatives via a [2,3]-Stevens Rearrangement and Ring-Closing Metathesis. Org Lett 2013; 15:4770-3. [DOI: 10.1021/ol402129h] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Aaron Nash
- Department of Biochemistry, The University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9038, United States
| | - Arash Soheili
- Department of Biochemistry, The University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9038, United States
| | - Uttam K. Tambar
- Department of Biochemistry, The University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9038, United States
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43
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Influence of norbornanone substituents on both the Wagner–Meerwein skeletal rearrangements under sulfonation conditions and the diastereoselectivity of the corresponding N,N′-bis-fumaroyl sultams in uncatalyzed Diels–Alder cycloadditions to cyclopenta-1,3-diene. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.05.147] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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44
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Zhou Y, Liu Q, Gong Y. Camphor-derived C1-symmetric chiral diamine organocatalysts for asymmetric Michael addition of nitroalkanes to enones. Org Biomol Chem 2013; 10:7618-27. [PMID: 22893041 DOI: 10.1039/c2ob25922b] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of stable C(1)-symmetric chiral diamines (2a–2l) were conveniently synthesized by condensing exo-(-)-bornylamine or (+)-(1S,2S,5R)-menthylamine with various commercially available Cbz-protected amino acids. Among them, 2a can efficiently promote the Michael addition of nitroalkanes to a broad scope of enones with high yields (up to 96%) and excellent enantioselectivities (up to 98%) under mild conditions.
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Affiliation(s)
- Yirong Zhou
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, People's Republic of China
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45
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Bauer T, Majdecki M, Jurczak J. Sugar-based monodentate phosphoramidite ligands for Cu-catalyzed enantioselective conjugate addition to enones. Tetrahedron 2013. [DOI: 10.1016/j.tet.2012.12.049] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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46
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Heterocyclization of 3-aminocamphor and 3-aminoisoborneol derivatives with cyclic β-diketones and formaldehyde. Synthesis of optically active 1,2,3,4-tetrahydroquinoline derivatives with terpene substituents. Chem Nat Compd 2012. [DOI: 10.1007/s10600-012-0261-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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47
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Grošelj U, Sevšek A, Ričko S, Golobič A, Svete J, Stanovnik B. Synthesis and structural characterization of novel camphor-derived amines. Chirality 2012; 24:778-88. [PMID: 22740342 DOI: 10.1002/chir.22069] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Accepted: 04/17/2012] [Indexed: 11/12/2022]
Abstract
Two novel 4-substituted camphidine derivatives 10a,b have been prepared from (+)-camphor (1) in five steps, the Beckmann rearrangement being the bottleneck of the synthesis. Isoborneol derivative 5b, formed as a side product during the hydrogenation of arylidene ketone 3b, under Beckmann rearrangement conditions yielded interesting novel rearrangement products 11 and 12. (1S)-(+)-Camphorquinone (13) was transformed into diamines 15 and 16 in two steps, the former being cyclized into an imidazoline salt 17, an N-heterocyclic carbene precursor. The structures of all novel compounds have been meticulously characterized using NMR techniques and/or single crystal X-ray analysis.
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Affiliation(s)
- Uroš Grošelj
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Slovenia.
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48
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49
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Grošelj U, Ričko S, Svete J, Stanovnik B. Synthesis of 2-(3-(3,5-bis(trifluoromethyl)phenyl)thioureido)-3-((dimethylamino)methyl)camphor organocatalysts. Chirality 2012; 24:412-9. [PMID: 22514057 DOI: 10.1002/chir.22035] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2011] [Accepted: 02/13/2012] [Indexed: 11/06/2022]
Abstract
In a stereo-divergent synthesis, three novel camphor-derived bifunctional thiourea organocatalysts 7-9 have been prepared in five steps starting from (+)-camphor. In addition, borneol-derived bifunctional thiourea organocatalysts 19/19' have been prepared in three steps from (1S)-(+)-camphorquinone. Novel organocatalysts 7-9, 19/19' have been evaluated in a model reaction of Michael addition of dimethyl malonate to trans-β-nitrostyrene with low to moderate enantioselectivities (20%-60% ee). Configuration of all novel compounds has been meticulously determined using nuclear magnetic resonance (NMR) techniques.
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Affiliation(s)
- Uroš Grošelj
- Organic chemistry, University of Ljubljana, Faculty of Chemistry and Chemical Technology, Ljubljana, Slovenia.
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50
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Kannappan J, Bedekar AV. An Environment Friendly Preparation of 3-Bromocamphor and Camphorquinone. JOURNAL OF CHEMICAL RESEARCH 2012. [DOI: 10.3184/174751912x13295761942437] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The bromination of camphor has been carried out on a multi-gram scale by a mixture of KBr and KBrO3 in the presence of acid or with HBr/NaBr - H+ and H2O2/oxone® as the oxidant. The 3-bromocamphor is then efficiently converted to camphorquinone by an improved oxidation protocol using DMSO and sodium carbonate of tetrabutyl ammonium iodide.
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Affiliation(s)
- Jayaraman Kannappan
- Apicore Pharmaceuticals Pvt. Ltd, Block No. 252-253, Dhobikuva Village, Padra-Jumbusar Highway, Padra Taluka, Vadodara 391 440, India
| | - Ashutosh V. Bedekar
- Department of Chemistry, Faculty of Science, M. S. University of Baroda, Vadodara, 390 002, India
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