1
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Riart-Ferrer X, Sang P, Tao J, Xu H, Jin LM, Lu H, Cui X, Wojtas L, Zhang XP. Metalloradical activation of carbonyl azides for enantioselective radical aziridination. Chem 2021; 7:1120-1134. [PMID: 33869888 DOI: 10.1016/j.chempr.2021.03.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Organic azides have been increasingly employed as nitrogen sources for catalytic olefine aziridination due to their ease of preparation and generation of benign N2 as the only byproduct. Among common organic azides, carbonyl azides have not been previously demonstrated as effective nitrogen sources for intermolecular olefin aziridination despite the synthetic utilities of N-carbonyl aziridines. As a new application of metalloradical catalysis, we have developed a catalytic system that can effectively employ the carbonyl azide TrocN3 for highly asymmetric aziridination of alkenes at room temperature. The resulting enantioenriched N-Trocaziridines have been shown as valuable chiral synthons for stereoselective synthesis of other chiral aziridines and various chiral amines. The Co(II)-based metalloradical system, which proceeds with distinctive stepwise radical mechanism, may provide a general method for asymmetric synthesis of chiral aziridines from alkenes with organic azides.
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Affiliation(s)
- Xavier Riart-Ferrer
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA 02467, USA
- These authors contributed equally
| | - Peng Sang
- Department of Chemistry, University of South Florida, Tampa, FL 33620, USA
- These authors contributed equally
| | - Jingran Tao
- Department of Chemistry, University of South Florida, Tampa, FL 33620, USA
- These authors contributed equally
| | - Hao Xu
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA 02467, USA
| | - Li-Mei Jin
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA 02467, USA
| | - Hongjian Lu
- Department of Chemistry, University of South Florida, Tampa, FL 33620, USA
| | - Xin Cui
- Department of Chemistry, University of South Florida, Tampa, FL 33620, USA
| | - Lukasz Wojtas
- Department of Chemistry, University of South Florida, Tampa, FL 33620, USA
| | - X Peter Zhang
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA 02467, USA
- Lead contact
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2
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Buttar S, Caine J, Goné E, Harris R, Gillman J, Atienza R, Gupta R, Sogi KM, Jain L, Abascal NC, Levine Y, Repka LM, Rojas CM. Glycal Metallanitrenes for 2-Amino Sugar Synthesis: Amidoglycosylation of Gulal-, Allal-, Glucal-, and Galactal 3-Carbamates. J Org Chem 2018; 83:8054-8080. [PMID: 29979042 PMCID: PMC6662188 DOI: 10.1021/acs.joc.8b00893] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The rhodium(II)-catalyzed oxidative cyclization of glycal 3-carbamates with in situ incorporation of an alcohol nucleophile at the anomeric position provides access to a range of 2-amino sugars having 1,2-trans-2,3-cis stereochemistry, a structural motif present in compounds of medicinal and biological significance such as the streptothricin group of antibiotics and the Chitinase inhibitor allosamidin. All of the diastereomeric d-glycal 3-carbamates have been investigated, revealing significant differences in anomeric stereoselectivity depending on substrate stereochemistry and protecting groups. In addition, some substrates were prone to forming C3-oxidized dihydropyranone byproducts under the reaction conditions. Allal- and gulal 3-carbamates provided uniformly high stereo- and chemoselectivity, while for glucal substrates, acyclic, electron-withdrawing protecting groups at the 4 O and 6 O positions were required. Galactal 3-carbamates have been the most challenging substrates; formation of their amidoglycosylation products is most effective with an electron-withdrawing 6 O-Ts substituent and a sterically demanding 4 O-TBS group. These results suggest a mechanism whereby conformational and electronic factors determine the partitioning of an intermediate acyl nitrenoid between alkene addition, leading to amidoglycosylation, and C3-H insertion, providing the dihydropyranone byproduct. Along the amidoglycosylation pathway, high anomeric selectivity results when a glycosyl aziridine intermediate is favored over an aziridine-opened oxocarbenium donor.
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Affiliation(s)
- Simran Buttar
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027, United States
| | - Julia Caine
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027, United States
| | - Evelyne Goné
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027, United States
| | - Reneé Harris
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027, United States
| | - Jennifer Gillman
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027, United States
| | - Roxanne Atienza
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027, United States
| | - Ritu Gupta
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027, United States
| | - Kimberly M. Sogi
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027, United States
| | - Lauren Jain
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027, United States
| | - Nadia C. Abascal
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027, United States
| | - Yetta Levine
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027, United States
| | - Lindsay M. Repka
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027, United States
| | - Christian M. Rojas
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027, United States
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3
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Su JY, Olson DE, Ting SI, Du Bois J. Synthetic Studies Toward Pactamycin Highlighting Oxidative C-H and Alkene Amination Technologies. J Org Chem 2018; 83:7121-7134. [PMID: 29708344 DOI: 10.1021/acs.joc.8b00142] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A strategy enabled by C-H and alkene amination technologies for synthesizing the aminocyclitol natural product, pactamycin, is disclosed. This work features two disparate approaches for assembling the five-membered ring core of the target, the first of which utilizes acyl anion catalysis and a second involving β-ketoester aerobic hydroxylation. Installation of the C3-N bond, one of three contiguous nitrogen centers, is made possible through Rh-catalyzed allylic C-H amination of a sulfamate ester. Subsequent efforts are presented to introduce the C1,C2 cis-diamino moiety en route to pactamycin, including carbamate-mediated alkene aziridination. In the course of these studies, assembly of the core of C2- epi-pactamycate, which bears the carbon skeleton and all of the requisite nitrogen and oxygen functional groups found in the natural product, has been achieved.
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Affiliation(s)
- Justin Y Su
- Department of Chemistry , Stanford University , 337 Campus Drive , Stanford , California 94305 , United States
| | - David E Olson
- Department of Chemistry , Stanford University , 337 Campus Drive , Stanford , California 94305 , United States
| | - Stephen I Ting
- Department of Chemistry , Stanford University , 337 Campus Drive , Stanford , California 94305 , United States
| | - J Du Bois
- Department of Chemistry , Stanford University , 337 Campus Drive , Stanford , California 94305 , United States
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4
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Jiang H, Lang K, Lu H, Wojtas L, Zhang XP. Asymmetric Radical Bicyclization of Allyl Azidoformates via Cobalt(II)-Based Metalloradical Catalysis. J Am Chem Soc 2017; 139:9164-9167. [PMID: 28650659 PMCID: PMC5553632 DOI: 10.1021/jacs.7b05778] [Citation(s) in RCA: 104] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Cobalt(II)-based metalloradical catalysis has been successfully applied to radical bicyclization of allyl azidoformates to construct aziridine/oxazolidinone-fused bicyclic structures. The Co(II) complex of D2-symmetric chiral amidoporphyrin 3,5-DitBu-QingPhyrin has been identified as an effective metalloradical catalyst for the intramolecular radical aziridination of this type of carbonyl azides, allowing for high-yielding formation of synthetically useful chiral [3.1.0]-bicyclic aziridines with high diastereo- and enantioselectivity.
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Affiliation(s)
- Huiling Jiang
- Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
| | - Kai Lang
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Hongjian Lu
- Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
| | - Lukasz Wojtas
- Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
| | - X. Peter Zhang
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
- Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
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5
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Murakami T, Sato Y, Yoshioka K, Tanaka M. Convenient stereocontrolled amidoglycosylation of alcohols with acetylated glycals and trichloroethoxysulfonamide. Carbohydr Res 2016; 434:121-131. [PMID: 27639338 DOI: 10.1016/j.carres.2016.09.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 09/02/2016] [Accepted: 09/02/2016] [Indexed: 11/27/2022]
Abstract
A regio- and stereo-controlled, rhodium(II)-catalyzed amidoglycosylation of alcohols has been developed using O-acetylated glycals, trichloroethoxysulfonamide, and iodosobenzene. This one-pot amidoglycosylation was applied to a variety of primary and secondary alcohols to afford the β-O-glycosides with acceptable yields up to 84%. The reaction would proceed via stereoselective intermolecular aziridination of the glycal from the α-face followed by SN2 reaction with alcohol at C-1 from the β-face to give 1,2:2,3-di-trans-substituted isomer only.
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Affiliation(s)
- Teiichi Murakami
- Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 6, Tsukuba, Ibaraki 305-8566, Japan.
| | - Yukari Sato
- Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 2, Tsukuba, Ibaraki 305-8562, Japan
| | - Kyoko Yoshioka
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 6, Tsukuba, Ibaraki 305-8566, Japan
| | - Mutsuo Tanaka
- Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 6, Tsukuba, Ibaraki 305-8566, Japan
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6
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Skarbek K, Milewska MJ. Biosynthetic and synthetic access to amino sugars. Carbohydr Res 2016; 434:44-71. [PMID: 27592039 DOI: 10.1016/j.carres.2016.08.005] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 08/11/2016] [Accepted: 08/20/2016] [Indexed: 12/01/2022]
Abstract
Amino sugars are important constituents of a number of biomacromolecules and products of microbial secondary metabolism, including antibiotics. For most of them, the amino group is located at the positions C1, C2 or C3 of the hexose or pentose ring. In biological systems, amino sugars are formed due to the catalytic activity of specific aminotransferases or amidotransferases by introducing an amino functionality derived from L-glutamate or L-glutamine to the keto forms of sugar phosphates or sugar nucleotides. The synthetic introduction of amino functionalities in a regio- and stereoselective manner onto sugar scaffolds represents a substantial challenge. Most of the modern methods of for the preparation of 1-, 2- and 3-amino sugars are those starting from "an active ester" of carbohydrate derivatives, glycals, alcohols, carbonyl compounds and amino acids. A substantial progress in the development of region- and stereoselective methods of amino sugar synthesis has been made in the recent years, due to the application of metal-based catalysts and tethered approaches. A comprehensive review on the current state of knowledge on biosynthesis and chemical synthesis of amino sugars is presented.
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Affiliation(s)
- Kornelia Skarbek
- Department of Organic Chemistry, Faculty of Chemistry, Gdańsk University of Technology, 11/12 Narutowicza Str., 80-233 Gdańsk, Poland
| | - Maria J Milewska
- Department of Organic Chemistry, Faculty of Chemistry, Gdańsk University of Technology, 11/12 Narutowicza Str., 80-233 Gdańsk, Poland.
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7
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Chang YJ, Hsuan YC, Lai ACY, Han YC, Hou DR. Synthesis of α-C-Galactosylceramide via Diastereoselective Aziridination: The New Immunostimulant 4'-epi-C-Glycoside of KRN7000. Org Lett 2016; 18:808-11. [PMID: 26844691 DOI: 10.1021/acs.orglett.6b00090] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new immunostimulant, the 4'-epimer of α-C-GalCer, was synthesized from a C2-symmetric dienediol and α-C-allyl galactoside. The intramolecular aziridination and the following reductive ring opening provided the core of the aliphatic amino alcohol with excellent regio- and stereocontrol. The new immunostimulants 3d and 3e gave a better polarized Th1-type cytokine response in murine NKT cells than the benchmarked α-C-GalCer.
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Affiliation(s)
- Ya-Jen Chang
- Institute of Biomedical Sciences, Academia Sinica , No. 128 Academia Road, Section 2, Nankang, Taipei, Taiwan 11529
| | - Yi-Chen Hsuan
- Department of Chemistry, National Central University , No. 300 Jhong-Da Road, Jhong-li, Taoyuan, Taiwan 32001
| | - Alan Chuan-Ying Lai
- Institute of Biomedical Sciences, Academia Sinica , No. 128 Academia Road, Section 2, Nankang, Taipei, Taiwan 11529
| | - Yun-Chiann Han
- Institute of Biomedical Sciences, Academia Sinica , No. 128 Academia Road, Section 2, Nankang, Taipei, Taiwan 11529
| | - Duen-Ren Hou
- Department of Chemistry, National Central University , No. 300 Jhong-Da Road, Jhong-li, Taoyuan, Taiwan 32001
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8
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Mirabella S, Cardona F, Goti A. From glycals to aminosugars: a challenging test for new stereoselective aminohydroxylation and related methodologies. Org Biomol Chem 2016; 14:5186-204. [DOI: 10.1039/c6ob00649c] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The most relevant methods to access 1-, 2-, 3-amino or 1,2-diaminosugars starting from unsaturated carbohydrates are concisely reviewed; the given examples illustrate the great challenges offered to several stereoselective strategies.
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Affiliation(s)
- S. Mirabella
- Dipartimento di Chimica “Ugo Schiff”
- Università degli Studi di Firenze
- Sesto Fiorentino (FI)
- Italy
| | - F. Cardona
- Dipartimento di Chimica “Ugo Schiff”
- Università degli Studi di Firenze
- Sesto Fiorentino (FI)
- Italy
| | - A. Goti
- Dipartimento di Chimica “Ugo Schiff”
- Università degli Studi di Firenze
- Sesto Fiorentino (FI)
- Italy
- ICCOM-CNR
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9
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Mirabella S, Cardona F, Goti A. Osmium-Catalyzed Tethered Aminohydroxylation of Glycals: A Stereodirected Access to 2- and 3-Aminosugars. Org Lett 2015; 17:728-31. [DOI: 10.1021/ol503754f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Stefania Mirabella
- Dipartimento di Chimica “Ugo
Schiff”, Università di Firenze, Via della Lastruccia 3-13, I-50019 Sesto Fiorentino (FI), Italy, associated with ICCOM-CNR, Firenze,
Italy
| | - Francesca Cardona
- Dipartimento di Chimica “Ugo
Schiff”, Università di Firenze, Via della Lastruccia 3-13, I-50019 Sesto Fiorentino (FI), Italy, associated with ICCOM-CNR, Firenze,
Italy
| | - Andrea Goti
- Dipartimento di Chimica “Ugo
Schiff”, Università di Firenze, Via della Lastruccia 3-13, I-50019 Sesto Fiorentino (FI), Italy, associated with ICCOM-CNR, Firenze,
Italy
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10
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Substrate scope and stereocontrol in the Rh(II)-catalysed oxyamination of allylic carbamates. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.06.051] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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11
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Murakami T, Sato Y, Yoshioka K, Tanaka M. Novel stereocontrolled amidoglycosylation of alcohols with acetylated glycals and sulfamate ester. RSC Adv 2014. [DOI: 10.1039/c4ra02367f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A regio- and stereo-controlled, one-pot amidoglycosylation of alcohols has been achieved using O-acetylated glycals, trichloroethoxysulfonamide, and iodosobenzene in the presence of a rhodium(ii) catalyst.
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Affiliation(s)
- Teiichi Murakami
- Biomedical Research Institute
- National Institute of Advanced Industrial Science and Technology (AIST)
- Tsukuba, Japan
| | - Yukari Sato
- Biomedical Research Institute
- National Institute of Advanced Industrial Science and Technology (AIST)
- Tsukuba, Japan
| | - Kyoko Yoshioka
- Biomedical Research Institute
- National Institute of Advanced Industrial Science and Technology (AIST)
- Tsukuba, Japan
| | - Mutsuo Tanaka
- Biomedical Research Institute
- National Institute of Advanced Industrial Science and Technology (AIST)
- Tsukuba, Japan
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12
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Budruev AV, Sinjagina DY. Photochemical modification of polyethylene surface with aryl azides. HIGH ENERGY CHEMISTRY 2013. [DOI: 10.1134/s0018143913050020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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HSAB-driven regioselectivity difference in the Lewis-acid catalyzed reactions of 2-C-substituted glycals with sulfur and oxygen nucleophiles: direct versus allylic substitution. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.09.122] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Marín I, Castilla J, Matheu MI, Díaz Y, Castillón S. Sequential Directed Epoxydation-Acidolysis from Glycals with MCPBA. A Flexible Approach to Protected Glycosyl Donors. J Org Chem 2011; 76:9622-9. [DOI: 10.1021/jo201165v] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Irene Marín
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007 Tarragona, Spain
| | - Javier Castilla
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007 Tarragona, Spain
| | - M. Isabel Matheu
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007 Tarragona, Spain
| | - Yolanda Díaz
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007 Tarragona, Spain
| | - Sergio Castillón
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007 Tarragona, Spain
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15
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Total Synthesis of Sialic Acid by a Sequential Rhodium-Catalyzed Aziridination and Barbier Allylation of D-Glycal. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201104516] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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16
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Lorpitthaya R, Suryawanshi SB, Wang S, Pasunooti KK, Cai S, Ma J, Liu XW. Total Synthesis of Sialic Acid by a Sequential Rhodium-Catalyzed Aziridination and Barbier Allylation of D-Glycal. Angew Chem Int Ed Engl 2011; 50:12054-7. [DOI: 10.1002/anie.201104516] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2011] [Revised: 09/09/2011] [Indexed: 12/15/2022]
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17
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Gautier FM, Djedaïni-Pilard F, Grandjean C. The iodosulfonamidation of peracetylated glycals revisited: access to 1,2-di-nitrogenated sugars. Carbohydr Res 2011; 346:577-87. [DOI: 10.1016/j.carres.2011.01.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2010] [Revised: 01/17/2011] [Accepted: 01/20/2011] [Indexed: 01/21/2023]
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18
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Hurlocker B, Abascal NC, Repka LM, Santizo-Deleon E, Smenton AL, Baranov V, Gupta R, Bernard SE, Chowdhury S, Rojas CM. Dihydropyranone formation by ipso C-H activation in a glucal 3-carbamate-derived rhodium acyl nitrenoid. J Org Chem 2011; 76:2240-4. [PMID: 21381715 DOI: 10.1021/jo101599q] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
By using (N-tosyloxy)-3-O-carbamoyl-D-glucal 10, which removes the need for a hypervalent iodine(III) oxidant, we provide evidence for rhodium nitrenoid-mediated ipso C-H activation as the origin of a C3-oxidized dihydropyranone product 3. This system may be especially susceptible to such a pathway because of the ease of forming a cation upon hydride transfer to the rhodium-complexed acyl nitrene.
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Affiliation(s)
- Brisa Hurlocker
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027, USA
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19
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Gupta R, Sogi KM, Bernard SE, Decatur JD, Rojas CM. Protecting group and solvent control of stereo- and chemoselectivity in glucal 3-carbamate amidoglycosylation. Org Lett 2009; 11:1527-30. [PMID: 19254041 PMCID: PMC2684990 DOI: 10.1021/ol900126q] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In the Rh(2)(OAc)(4)-catalyzed amidoglycosylation of glucal 3-carbamates, anomeric stereoselectivity and the extent of competing C3-H oxidation depend on the 4O and 6O protecting groups. Acyclic protection permits high alpha-anomer selectivity with further improvement in less polar solvents, while electron-withdrawing protecting groups limit C3-oxidized byproducts. Stereocontrol and bifurcation between alkene insertion and C3-H oxidation reflect an interplay of conformational, stereoelectronic, and inductive factors.
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Affiliation(s)
- Ritu Gupta
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027 and Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027
| | - Kimberly M. Sogi
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027 and Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027
| | - Sarah E. Bernard
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027 and Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027
| | | | - Christian M. Rojas
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027 and Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027
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20
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Lorpitthaya R, Sophy KB, Kuo JL, Liu XW. Highly stereoselective synthesis of aminoglycosides via rhodium-catalyzed and substrate-controlled aziridination of glycals. Org Biomol Chem 2009; 7:1284-7. [DOI: 10.1039/b823099b] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Affiliation(s)
- Takehiko Yoshimitsu
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Tatsunori Ino
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Tetsuaki Tanaka
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
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22
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Abstract
Therapeutic vaccines derived from carbohydrate antigen-adjuvant combinations are a promising approach for cancer immunotherapy. One of the critical limitations in this area is access to sufficient quantities of tumour-associated carbohydrate antigens and glycoconjugate adjuvants. At present, availability of the complex oligosaccharide constructs that are needed for the systematic design and evaluation of novel vaccine formulations relies on de novo chemical synthesis. The use of both state-of-the-art and emerging glycosylation technologies has led to significant advances in this field, allowing the clinical exploration of carbohydrate-based antigens in the treatment of cancer.
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Affiliation(s)
- Danica P Galonić
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, USA.
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Colombo L, di Giacomo M, Ciceri P. Practical stereoselective synthesis of α-d-C-mannosyl-(R)-alanine. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)01225-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Amidochlorination of 4-O-Azidoformyl-D-pseudoglycals with Iron (Ⅱ) Chloride and Chlorotrimethylsilane. B KOREAN CHEM SOC 2002. [DOI: 10.5012/bkcs.2002.23.9.1325] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Churchill DG, Rojas CM. Iron(II)-promoted amidoglycosylation and amidochlorination of an allal C3–azidoformate. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)01658-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Levites-Agababa E, Menhaji E, Perlson LN, Rojas CM. Amidoglycosylation via metal-catalyzed internal nitrogen atom delivery. Org Lett 2002; 4:863-5. [PMID: 11869147 DOI: 10.1021/ol025634k] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] Rhodium and copper acyl nitrenoids are likely intermediates in amidoglycosylation reactions of allal 3-carbamates. Iodine(III)-mediated nitrenoid formation, interaction of this species with the glycal enol ether pi-system, and highly beta-stereoselective glycosylation occur in a one-pot process that requires no additional Lewis acid activation.
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Affiliation(s)
- Elana Levites-Agababa
- Department of Chemistry, Barnard College, 3009 Broadway, New York, New York 10027, USA
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