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Tsubogo T, Okamura F, Omori A, Uchiro H. An Efficient and Short Total Synthesis of (−)‐Heliannuol A by Intramolecular Ullmann C−O Coupling for the Construction of an Eight‐Membered Ether Ring. ChemistrySelect 2021. [DOI: 10.1002/slct.202100355] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Tetsu Tsubogo
- Faculty of Pharmaceutical Sciences Tokyo University of Science 2641 Yamazaki Noda Chiba 278-8510 Japan
- Division of Fusion of Regenerative Medicine with DDS Research Institute for Science and Technology (RIST) Tokyo University of Science 2641 Yamazaki Noda Chiba 278-8510 Japan
- Current address: Faculty of Pharmaceutical Sciences Health Sciences University of Hokkaido, 1757 Kanazawa, Ishikari-tobetsu Hokkaido 0610-293 Japan
| | - Fumiya Okamura
- Faculty of Pharmaceutical Sciences Tokyo University of Science 2641 Yamazaki Noda Chiba 278-8510 Japan
| | - Akiho Omori
- Faculty of Pharmaceutical Sciences Tokyo University of Science 2641 Yamazaki Noda Chiba 278-8510 Japan
| | - Hiromi Uchiro
- Faculty of Pharmaceutical Sciences Tokyo University of Science 2641 Yamazaki Noda Chiba 278-8510 Japan
- Division of Fusion of Regenerative Medicine with DDS Research Institute for Science and Technology (RIST) Tokyo University of Science 2641 Yamazaki Noda Chiba 278-8510 Japan
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2
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Dagoneau D, Wang Q, Zhu J. Towards the Sarpagine-Ajmaline-Macroline Family of Indole Alkaloids: Enantioselective Synthesis of an N-Demethyl Alstolactone Diastereomer. Chemistry 2020; 26:4866-4873. [PMID: 32065430 DOI: 10.1002/chem.202000415] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 02/14/2020] [Indexed: 12/19/2022]
Abstract
the strategy involving the use of functionalized tetrahydro-6H-cycloocta[b]indol-6-one is reported as a key intermediate for synthesis of members of the sarpagine-ajmaline-macroline family of monoterpene indole alkaloids. The desired tricycle was synthesized through the following key steps: 1) Evans' syn-selective aldolization; 2) Liebeskind-Srogl cross-coupling using the phenylthiol ester of 3-chloropropanoic acid as a surrogate of acrylic thioester for the synthesis of 2,3-disubstituted indoles; and 3) ring-closing metathesis (RCM) for the formation of the eight-membered ring. An N-allylation followed by intramolecular 1,4-addition was planned for synthesis of the vobasine class of natural products. However, attempted cyclizations under a diverse set of conditions involving anionic, radical, and organopalladium/organonickel species failed to produce the bridged ring system. On the other hand, esterification of the pendant primary alcohol function with acetoacetic acid, followed by intramolecular Michael addition, afforded the desired tetracycle with excellent diastereoselectivity. Subsequent functional group manipulation and transannular cyclization of the amino alcohol afforded the N(1)-demethyl-3,5-diepi-alstolactone. We believe that the same synthetic route would afford the alstolactone should the amino alcohol with appropriate stereochemistry be used as the starting material.
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Affiliation(s)
- Dylan Dagoneau
- Laboratory of Synthesis and Natural Products, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, BCH 5304, 1015, Lausanne, Switzerland
| | - Qian Wang
- Laboratory of Synthesis and Natural Products, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, BCH 5304, 1015, Lausanne, Switzerland
| | - Jieping Zhu
- Laboratory of Synthesis and Natural Products, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, BCH 5304, 1015, Lausanne, Switzerland
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3
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Khatri HR, Bhattarai B, Kaplan W, Li Z, Curtis Long MJ, Aye Y, Nagorny P. Modular Total Synthesis and Cell-Based Anticancer Activity Evaluation of Ouabagenin and Other Cardiotonic Steroids with Varying Degrees of Oxygenation. J Am Chem Soc 2019; 141:4849-4860. [PMID: 30802047 PMCID: PMC6516474 DOI: 10.1021/jacs.8b12870] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A Cu(II)-catalyzed diastereoselective Michael/aldol cascade approach is used to accomplish concise total syntheses of cardiotonic steroids with varying degrees of oxygenation including cardenolides ouabagenin, sarmentologenin, 19-hydroxysarmentogenin, and 5- epi-panogenin. These syntheses enabled the subsequent structure activity relationship (SAR) studies on 37 synthetic and natural steroids to elucidate the effect of oxygenation, stereochemistry, C3-glycosylation, and C17-heterocyclic ring. Based on this parallel evaluation of synthetic and natural steroids and their derivatives, glycosylated steroids cannogenol-l-α-rhamnoside (79a), strophanthidol-l-α-rhamnoside (92), and digitoxigenin-l-α-rhamnoside (97) were identified as the most potent steroids demonstrating broad anticancer activity at 10-100 nM concentrations and selectivity (nontoxic at 3 μM against NIH-3T3, MEF, and developing fish embryos). Further analyses indicate that these molecules show a general mode of anticancer activity involving DNA-damage upregulation that subsequently induces apoptosis.
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Affiliation(s)
- Hem Raj Khatri
- Chemistry Department, University of Michigan, Ann Arbor, MI 48109 USA
| | - Bijay Bhattarai
- Chemistry Department, University of Michigan, Ann Arbor, MI 48109 USA
| | - Will Kaplan
- Chemistry Department, University of Michigan, Ann Arbor, MI 48109 USA
| | - Zhongzheng Li
- Department of Chemistry, Nankai University, Nankai, People Republic of China
| | | | - Yimon Aye
- École Polytechnique Fédérale de Lausanne, Institute of Chemical Sciences and Engineering, 1015, Lausanne, Switzerland
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853 USA
| | - Pavel Nagorny
- Chemistry Department, University of Michigan, Ann Arbor, MI 48109 USA
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4
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Li X, Kong X, Yang S, Meng M, Zhan X, Zeng M, Fang X. Bifunctional Thiourea-Catalyzed Asymmetric Inverse-Electron-Demand Diels–Alder Reaction of Allyl Ketones and Vinyl 1,2-Diketones via Dienolate Intermediate. Org Lett 2019; 21:1979-1983. [DOI: 10.1021/acs.orglett.9b00035] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Xinglong Li
- State Key Laboratory of Structural Chemistry, and Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
| | - Xiangwen Kong
- State Key Laboratory of Structural Chemistry, and Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
| | - Shuang Yang
- State Key Laboratory of Structural Chemistry, and Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
| | - Miao Meng
- Department of Chemistry, Jinan University, Guangzhou 510632, China
| | - Xinyue Zhan
- College of Chemistry, Fuzhou University, Fuzhou 350116, China
| | - Min Zeng
- College of Chemistry, Fuzhou University, Fuzhou 350116, China
| | - Xinqiang Fang
- State Key Laboratory of Structural Chemistry, and Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
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5
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Meng Z, Fürstner A. Total Synthesis of (−)-Sinulariadiolide. A Transannular Approach. J Am Chem Soc 2018; 141:805-809. [DOI: 10.1021/jacs.8b12185] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Zhanchao Meng
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
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Ning Y, Otani Y, Ohwada T. Contrasting C- and O-Atom Reactivities of Neutral Ketone and Enolate Forms of 3-Sulfonyloxyimino-2-methyl-1-phenyl-1-butanones. J Org Chem 2018; 83:203-219. [PMID: 29189006 DOI: 10.1021/acs.joc.7b02573] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The mechanisms of intramolecular cyclization of 3-sulfonyloxyimino-2-methyl-1-phenyl-1-butanones (1) under basic (DABCO and t-BuOK) and acidic (AcOH and TFA) conditions were investigated by means of experimental and computational methods. The ketone, enol, and enolate forms of 1 can afford different intramolecular cyclization products (2, 3, 4), depending on the conditions. The results of the reaction of 1 under basic conditions suggest intermediacy of neutral enol (DABCO) and anionic enolate (t-BuOK), while the results under acidic conditions (AcOH and TFA) indicate involvement of neutral ketones, which exhibit reactivities arising from both the oxygen lone-pair electrons (O atom reactivity) and carbon σ-electrons (C atom reactivity). The neutral enol in DABCO afforded 2H-azirine 4. On the other hand, the products (isoxazole 2 and oxazole 3) generated from the ketone form and from the enolate form are the same, but the reaction mechanisms are apparently different. The results demonstrate ambident-like reactivity of neutral ketone in the 3-sulfonyloxyimino-2-methyl-1-phenyl-1-butanone system.
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Affiliation(s)
- Yingtang Ning
- Graduate School of Pharmaceutical Sciences, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033, Japan
| | - Yuko Otani
- Graduate School of Pharmaceutical Sciences, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033, Japan
| | - Tomohiko Ohwada
- Graduate School of Pharmaceutical Sciences, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033, Japan
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7
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Lee S, Bae M, In J, Kim JH, Kim S. Asymmetric Total Synthesis of Lepadiformine C Using Memory of Chirality in an Intramolecular Ester Enolate Michael Addition. Org Lett 2016; 19:254-257. [DOI: 10.1021/acs.orglett.6b03550] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Seokwoo Lee
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Minsik Bae
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Jinkyung In
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Jae Hyun Kim
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Sanghee Kim
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
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Kaplan W, Khatri HR, Nagorny P. Concise Enantioselective Total Synthesis of Cardiotonic Steroids 19-Hydroxysarmentogenin and Trewianin Aglycone. J Am Chem Soc 2016; 138:7194-8. [PMID: 27232585 PMCID: PMC5015484 DOI: 10.1021/jacs.6b04029] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The expedient and scalable approach to cardiotonic steroids carrying oxygenation at the C11- and C19-positions has been developed and applied to the total asymmetric synthesis of steroids 19-hydroxysarmentogenin and trewianin aglycone as well as to the assembly of the panogenin core. This new approach features enantioselective organocatalytic oxidation of an aldehyde, diastereoselective Cu(OTf)2-catalyzed Michael reaction/tandem aldol cyclizations, and one-pot reduction/transposition reactions allowing a rapid (7 linear steps) assembly of a functionalized cardenolide skeleton. The ability to quickly set this steroidal core with preinstalled functional handles and diversity elements eliminates the need for difficult downstream functionalizations and substantially improves the accessibility to the entire class of cardenolides and their derivatives for biological evaluation.
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Affiliation(s)
- Will Kaplan
- Chemistry Department, University of Michigan, Ann Arbor, MI 48109
| | - Hem Raj Khatri
- Chemistry Department, University of Michigan, Ann Arbor, MI 48109
| | - Pavel Nagorny
- Chemistry Department, University of Michigan, Ann Arbor, MI 48109
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9
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Athe S, Sharma A, Marumudi K, Ghosh S. Synthetic studies of callyspongiolide: synthesis of the macrolactone core of the molecule. Org Biomol Chem 2016; 14:6769-79. [DOI: 10.1039/c6ob01007e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Synthesis of the fully functionalized macrolactone core of the highly cytotoxic marine natural product callyspongiolide has been achievedviaaZ-selective intramolecular H–W–E reaction and allylic alkylation of an activatedZ-allylic alcoholviaan SN2′ fashion as key steps.
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Affiliation(s)
- Sudhakar Athe
- Organic and Biomolecular Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
| | - Ashish Sharma
- Organic and Biomolecular Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
| | - Kanakaraju Marumudi
- Centre for NMR & Structural Chemistry
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
| | - Subhash Ghosh
- Organic and Biomolecular Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
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10
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Dibello E, Gamenara D, Seoane G. Preparation ofO-Protected Glyceraldehydes as Building Blocks in Organic Synthesis. ORG PREP PROCED INT 2015. [DOI: 10.1080/00304948.2015.1088753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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11
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Younai A, Zeng BS, Meltzer HY, Scheidt KA. Enantioselective Syntheses of Heteroyohimbine Natural Products: A Unified Approach through Cooperative Catalysis. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201502011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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12
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Younai A, Zeng BS, Meltzer HY, Scheidt KA. Enantioselective Syntheses of Heteroyohimbine Natural Products: A Unified Approach through Cooperative Catalysis. Angew Chem Int Ed Engl 2015; 54:6900-4. [DOI: 10.1002/anie.201502011] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Indexed: 12/28/2022]
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13
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Aher RD, Kumar BS, Sudalai A. Proline-Catalyzed Sequential syn-Mannich and [4 + 1]-Annulation Cascade Reactions To Form Densely Functionalized Pyrrolidines. J Org Chem 2015; 80:2024-31. [DOI: 10.1021/jo5028886] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Ravindra D. Aher
- Chemical Engineering & Process Development Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, Maharashtra, India 411008
| | - B. Senthil Kumar
- Chemical Engineering & Process Development Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, Maharashtra, India 411008
| | - Arumugam Sudalai
- Chemical Engineering & Process Development Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, Maharashtra, India 411008
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14
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Lu P, Jackson JJ, Eickhoff JA, Zakarian A. Direct enantioselective conjugate addition of carboxylic acids with chiral lithium amides as traceless auxiliaries. J Am Chem Soc 2015; 137:656-9. [PMID: 25562717 PMCID: PMC4308744 DOI: 10.1021/ja512213c] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Michael addition is a premier synthetic method for carbon-carbon and carbon-heteroatom bond formation. Using chiral dilithium amides as traceless auxiliaries, we report the direct enantioselective Michael addition of carboxylic acids. A free carboxyl group in the product provides versatility for further functionalization, and the chiral reagent can be readily recovered by extraction with aqueous acid. The method has been applied in the enantioselective total synthesis of the purported structure of pulveraven B.
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Affiliation(s)
- Ping Lu
- Department of Chemistry and Biochemistry, University of California , Santa Barbara, California 93106, United States
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15
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Fàbregas M, Gómez-Palomino A, Pellicena M, Reina DF, Romea P, Urpí F, Font-Bardia M. Substrate-controlled Michael additions of chiral ketones to enones. Org Lett 2014; 16:6220-3. [PMID: 25423031 DOI: 10.1021/ol503133j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Substrate-controlled Michael additions of the titanium(IV) enolate of lactate-derived ketone 1 to acyclic α,β-unsaturated ketones in the presence of a Lewis acid (TiCl4 or SnCl4) provide the corresponding 2,4-anti-4,5-anti dicarbonyl compounds in good yields and excellent diastereomeric ratios. Likely, the nucleophilic species involved in such additions are bimetallic enolates that may add to enones through cyclic transition states. Finally, further studies indicate that a structurally related β-benzyloxy chiral ketone can also participate in such stereocontrolled conjugate additions.
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Affiliation(s)
- Mireia Fàbregas
- †Departament de Química Orgànica and Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
| | - Alejandro Gómez-Palomino
- †Departament de Química Orgànica and Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
| | - Miquel Pellicena
- †Departament de Química Orgànica and Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
| | - Daniel F Reina
- †Departament de Química Orgànica and Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
| | - Pedro Romea
- †Departament de Química Orgànica and Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
| | - Fèlix Urpí
- †Departament de Química Orgànica and Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
| | - Mercè Font-Bardia
- ‡Unitat de Difracció de RX. CCiTUB, Universitat de Barcelona, Carrer Solé i Sabarís 1-3, 08028 Barcelona, Catalonia, Spain
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16
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Roosen PC, Vanderwal CD. Investigations into an anionic oxy-cope/transannular conjugate addition approach to 7,20-diisocyanoadociane. Org Lett 2014; 16:4368-71. [PMID: 25105694 DOI: 10.1021/ol502205m] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
An anionic oxy-Cope/transannular conjugate addition approach to the potent antimalarial 7,20-diisocyanoadociane is presented. The unexpected formation of undesired diastereomers in the key reaction led to the structural reassignment of previous products of this type of cascade and a reevaluation of the reversibility of the transannular ring closure. During efforts to coax the reaction toward the desired product, a transannular ene reaction provided tricyclic compounds relevant to the kempane diterpenoids.
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Affiliation(s)
- Philipp C Roosen
- Department of Chemistry, 1102 Natural Sciences II, University of California , Irvine, California 92697-2025, United States
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