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Ogasahara R, Abdullayev S, Sarpe VA, Mandhapati AR, Crich D. Influence of protecting groups on O- and C-glycosylation with neuraminyl and ulosonyl dibutylphosphates. Carbohydr Res 2020; 496:108100. [PMID: 32755675 DOI: 10.1016/j.carres.2020.108100] [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: 06/05/2020] [Revised: 07/07/2020] [Accepted: 07/09/2020] [Indexed: 12/15/2022]
Abstract
The adamantanyl thioglycosides of 5-isothiocyano and 5-azido 5-desamino-4,7,8,9-tetra-O-acetylneuraminic acid methyl ester were converted into the corresponding dibutyl phosphates, which proved to be excellent α-selective donors for O-sialidation with a range of typical acceptors, and good donors for reaction with allyltributylstannane, albeit without significant anomeric selectivity. In the KDN series the dibuylphosphate derived from a donor carrying a 4,5-cyclic carbonate protecting group afforded the corresponding C-glycoside with excellent α-selectivity on activation in the presence of allyltributylstannane, whereas the corresponding donor carrying acetate esters at the 4- and 5-positions was unselective. Overall, it is revealed that while the strongly electron-withdrawing isothiocyanato and azido groups are sufficient to promote highly α-selective O-sialidation, they are inadequate when faced with less reactive nucleophiles when mixtures of anomers are obtained.
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Affiliation(s)
- Riku Ogasahara
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI, 48202, USA; Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa, 223-8522, Japan
| | - Shuay Abdullayev
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI, 48202, USA; Department of Chemistry, Université Claude Bernard Lyon 1, Domaine Scientifique de la Doua, boulevard du 11 Novembre 1918, 69622, Villeurbanne Cedex, France
| | - Vikram A Sarpe
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, 250 West Green Street, Athens, GA, 30602, United States; Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, GA, 30602, United States
| | - Appi Reddy Mandhapati
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI, 48202, USA
| | - David Crich
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI, 48202, USA; Department of Pharmaceutical and Biomedical Sciences, University of Georgia, 250 West Green Street, Athens, GA, 30602, United States; Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, GA, 30602, United States; Department of Chemistry, University of Georgia, 140 Cedar Street, Athens, GA, 30602, United States.
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2
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A stereoselective approach in preparation of γ-lactam precursors for oxazolomycin’s synthesis. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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3
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Amarasekara H, Crich D. Synthesis and intramolecular glycosylation of sialyl mono-esters of o-xylylene glycol. The importance of donor configuration and nitrogen protecting groups on cyclization yield and selectivity; isolation and characterization of a N-sialyl acetamide indicative of participation by acetonitrile. Carbohydr Res 2016; 435:113-120. [PMID: 27744142 PMCID: PMC5110385 DOI: 10.1016/j.carres.2016.09.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 09/21/2016] [Accepted: 09/23/2016] [Indexed: 10/20/2022]
Abstract
The synthesis and cyclization reactions, leading to spirocyclic medium ring-sized diolides, of o-(hydroxymethyl)xylylene monoesters of sialyl thioglycosides is described. Cyclization yields and stereoselectivities are found to vary as a function of the anomeric stereochemistry of the thioglycoside and of the N5 protecting group, and these effects are discussed in terms of the reaction mechanism. Cyclization in the presence of acetonitrile results in the isolation and characterization of a Ritter-type N-sialyl acetamide, which affords strong evidence for the participation of acetonitrile in the form of sialyl nitrilium ions.
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Affiliation(s)
| | - David Crich
- Department of Chemistry, Wayne State University, Detroit, MI 48202, USA.
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Szcześniak P, Pieczykolan M, Stecko S. The Synthesis of α,α-Disubstituted α-Amino Acids via Ichikawa Rearrangement. J Org Chem 2016; 81:1057-74. [PMID: 26726732 DOI: 10.1021/acs.joc.5b02628] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
An approach to α,α-disubstituted α-amino acids is reported. The key step is allyl cyanate-to-isocyanate rearrangement. As demonstrated, the resultant allyl isocyanates can be directly trapped with various nucleophiles, for instance, alcohols, amines, and organometallic reagents, to provide a broad range of N-functionalized allylamines. The developed method has been successfully applied in the synthesis of two bioactive peptides: 2-aminoadamantane-2-carboxylic acid derived P2X7-evoked glutamate release inhibitor and 4-amino-tetrahydropyranyl-4-carboxylic acid derived dipeptide GSK-2793660, which is currently in clinical trials as cathepsin C inhibitor for the treatment of cystic fibrosis, noncystic fibrosis bronchiectasis, ANCA-associated vasculitis and bronchiectasis.
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Affiliation(s)
- Piotr Szcześniak
- Institute of Organic Chemistry , Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Michał Pieczykolan
- Institute of Organic Chemistry , Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Sebastian Stecko
- Institute of Organic Chemistry , Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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5
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Bera S, Chatterjee B, Mondal D. Construction of quaternary stereocentres on carbohydrate scaffolds. RSC Adv 2016. [DOI: 10.1039/c6ra13898e] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
This review describes a glimpse of the various strategies for constructing stereo-defined quaternary centres in densely functionalised carbohydrates moiety of structurally intriguing and biologically potent natural products and building blocks.
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Affiliation(s)
- Smritilekha Bera
- School of Chemical Sciences
- Central University of Gujarat
- Gandhinagar-382030
- India
| | | | - Dhananjoy Mondal
- School of Chemical Sciences
- Central University of Gujarat
- Gandhinagar-382030
- India
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6
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Mandhapati AR, Rajender S, Shaw J, Crich D. The isothiocyanato moiety: an ideal protecting group for the stereoselective synthesis of sialic acid glycosides and subsequent diversification. Angew Chem Int Ed Engl 2015; 54:1275-8. [PMID: 25446629 PMCID: PMC4300277 DOI: 10.1002/anie.201409797] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Indexed: 01/14/2023]
Abstract
The preparation of a crystalline, peracetyl adamantanyl thiosialoside donor protected by an isothiocyanate group is described. On activation at -78 °C in the presence of typical carbohydrate acceptors, this donor gives high yields of the corresponding sialosides with exquisite α-selectivity. The high selectivity extends to the 4-O-benzyl-protected 3-OH acceptors, which are typically less reactive and selective than galactose 3,4-diols. Treatment of the α-sialosides with tris(trimethylsilyl)silane or allyltris(trimethylsilyl)silane results in replacement of the C5-N5 bond by a C-H or a C-C bond. The reaction of the isothiocyanate-protected sialosides with thioacids generates amides, while reaction with an amine gives a thiourea, which can be converted into a guanidine. The very high α-selectivities observed with the new donor and the rich chemistry of the isothiocyante function considerably extend the scope for optimization at the sialoside 5-position.
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Affiliation(s)
- Appi Reddy Mandhapati
- Department of Chemistry, Wayne State University, Detroit, MI 48202, USA, Fax: (+) 313 577 8822, Homepage: chem.wayne.edu/crichgroup
| | - Salla Rajender
- Department of Chemistry, Wayne State University, Detroit, MI 48202, USA, Fax: (+) 313 577 8822, Homepage: chem.wayne.edu/crichgroup
| | - Jonathan Shaw
- Department of Chemistry, Wayne State University, Detroit, MI 48202, USA, Fax: (+) 313 577 8822, Homepage: chem.wayne.edu/crichgroup
| | - David Crich
- Department of Chemistry, Wayne State University, Detroit, MI 48202, USA, Fax: (+) 313 577 8822, Homepage: chem.wayne.edu/crichgroup
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Mandhapati AR, Rajender S, Shaw J, Crich D. The Isothiocyanato Moiety: An Ideal Protecting Group for the Stereoselective Synthesis of Sialic Acid Glycosides and Subsequent Diversification. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201409797] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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8
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Matsumoto N, Tsujimoto T, Nakazaki A, Isobe M, Nishikawa T. Synthetic studies on pactamycin, a potent antitumor antibiotic. RSC Adv 2012. [DOI: 10.1039/c2ra21060f] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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9
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Clayden J, Donnard M, Lefranc J, Tetlow DJ. Quaternary centres bearing nitrogen (α-tertiary amines) as products of molecular rearrangements. Chem Commun (Camb) 2011; 47:4624-39. [DOI: 10.1039/c1cc00049g] [Citation(s) in RCA: 149] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Gonda J, Martinková M, Baur A. A short stereoselective synthesis of the protected uracil 3′-epi-polyoxin C. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.tetasy.2011.02.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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11
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Total synthesis of a protected form of sphingofungin E using the [3,3]-sigmatropic rearrangement of an allylic thiocyanate as the key reaction. Carbohydr Res 2010; 345:2427-37. [PMID: 20943213 DOI: 10.1016/j.carres.2010.09.016] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2010] [Revised: 09/08/2010] [Accepted: 09/13/2010] [Indexed: 11/22/2022]
Abstract
An approach to the stereocontrolled synthesis of the protected form of sphingofungin E (32) starting from the known protected d-glucose derivative 3 is described herein. For the construction of a tetrasubstituted carbon atom that is substituted with nitrogen, the [3,3]-sigmatropic rearrangement of thiocyanate 8 was employed. Subsequent functional group interconversions afforded the highly functionalized fragment, allylic bromide 26. Its coupling reaction with the known C(12) hydrophobic segment 2, followed by further manipulation, completed the total synthesis.
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12
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Crich D, Sasaki K. Reaction of thioacids with isocyanates and isothiocyanates: a convenient amide ligation process. Org Lett 2009; 11:3514-7. [PMID: 19719195 DOI: 10.1021/ol901370y] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Thiocarboxylates, prepared conveniently by cleavage of 9-fluorenylmethyl or trimethoxybenzyl thioesters, react at room temperature with isocyanates and isothiocyanates to give amide bonds in good to excellent yield. A carboxylate salt is also shown to react with an electron-deficient isocyanate to give the corresponding amide in excellent yield at room temperature.
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Affiliation(s)
- David Crich
- Centre Scientifique de Gif, Institut de Chimie des Substances Naturelles, 1 Avenue de la Terrasse, 91198 Gif-sur-Yvette, France.
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Gonda J, Martinková M, Raschmanová J, Balentová E. Creation of quarternary stereocentres via [3,3]-sigmatropic rearrangement of allylic thiocyanates. A synthetic approach to (+)-myriocin. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.tetasy.2006.06.032] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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14
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Gonda J, Martinková M, Walko M, Zavacká E, Buděšı́nský M, Cı́sařová I. Stereoselective synthesis of the 5′-aminofuranoside part of polyoxins via (3,3)-sigmatropic rearrangement of allylic thiocyanates. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)00735-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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