Reversible-hydrogen-transfer-mediated anomerization of azaheterocyclyl 2-deoxy-C-glycosides and mechanistic studies
Mutarotation of O-glycans and O-glycosides has long been well-established and exploited in the stereocontrolled chemical synthesis of O-glycosides, while few examples of C-glycoside anomerization are known to date. During the development of a simple iridium catalyst-promoted α-stereoselective C-glyc...
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sg-ntu-dr.10356-1702642023-09-05T05:19:16Z Reversible-hydrogen-transfer-mediated anomerization of azaheterocyclyl 2-deoxy-C-glycosides and mechanistic studies Mu, Qiu-Qi Guo, Aoxin Cai, Xin Qin, Yang-Yang Fang, Xin-Yu Peng, Li-Cong Feng, Chao Xu, Li-Wen Xiao, Xiong Liu, Xue-Wei School of Chemistry, Chemical Engineering and Biotechnology Science::Chemistry Reversible-Hydrogen-Transfer C-Glycoside Anomerization Mutarotation of O-glycans and O-glycosides has long been well-established and exploited in the stereocontrolled chemical synthesis of O-glycosides, while few examples of C-glycoside anomerization are known to date. During the development of a simple iridium catalyst-promoted α-stereoselective C-glycosylation of 2-indoly-pyridine with glycal donors, we serendipitously discovered the occurrence of 2-deoxy-C-glycoside anomerization, enabling α-to-β configuration conversion. Control experiments and density functional theory calculations were performed to explore the mechanistic details of the anomerization of the C-glycosylation products, which could tolerate C-aryl and C-alkyl-glycosides. The anomerization reaction plausibly proceeds through the pathway involving the activation of the C(sp3)-H bond mediated by the iridium catalyst and reversible hydrogen transfer, rather than the classical anomerization mechanisms involving the endocyclic cleavage of the C1-O5 bond or exocyclic cleavage of the glycosidic bond. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) Nanyang Technological University Q.-Q.M. thanks Northwestern Polytechnical University (grant numbers G2021KY05111 and 21GH0201186) and X.-W.L. acknowledges Nanyang Technological University (MOE Tier 1, RG9/20), Ministry of Education (MOE-T2EP30120-0007), and A*STAR (A20E5c0087), Singapore for the generous financial support. 2023-09-05T05:19:16Z 2023-09-05T05:19:16Z 2023 Journal Article Mu, Q., Guo, A., Cai, X., Qin, Y., Fang, X., Peng, L., Feng, C., Xu, L., Xiao, X. & Liu, X. (2023). Reversible-hydrogen-transfer-mediated anomerization of azaheterocyclyl 2-deoxy-C-glycosides and mechanistic studies. ACS Catalysis, 13(8), 5656-5664. https://dx.doi.org/10.1021/acscatal.2c06308 2155-5435 https://hdl.handle.net/10356/170264 10.1021/acscatal.2c06308 2-s2.0-85152652934 8 13 5656 5664 en RG9/20 MOE-T2EP30120-0007 A20E5c0087 ACS Catalysis © 2023 American Chemical Society. All rights reserved. |
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Science::Chemistry Reversible-Hydrogen-Transfer C-Glycoside Anomerization Mu, Qiu-Qi Guo, Aoxin Cai, Xin Qin, Yang-Yang Fang, Xin-Yu Peng, Li-Cong Feng, Chao Xu, Li-Wen Xiao, Xiong Liu, Xue-Wei Reversible-hydrogen-transfer-mediated anomerization of azaheterocyclyl 2-deoxy-C-glycosides and mechanistic studies |
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Mutarotation of O-glycans and O-glycosides has long been well-established and exploited in the stereocontrolled chemical synthesis of O-glycosides, while few examples of C-glycoside anomerization are known to date. During the development of a simple iridium catalyst-promoted α-stereoselective C-glycosylation of 2-indoly-pyridine with glycal donors, we serendipitously discovered the occurrence of 2-deoxy-C-glycoside anomerization, enabling α-to-β configuration conversion. Control experiments and density functional theory calculations were performed to explore the mechanistic details of the anomerization of the C-glycosylation products, which could tolerate C-aryl and C-alkyl-glycosides. The anomerization reaction plausibly proceeds through the pathway involving the activation of the C(sp3)-H bond mediated by the iridium catalyst and reversible hydrogen transfer, rather than the classical anomerization mechanisms involving the endocyclic cleavage of the C1-O5 bond or exocyclic cleavage of the glycosidic bond. |
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School of Chemistry, Chemical Engineering and Biotechnology |
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School of Chemistry, Chemical Engineering and Biotechnology Mu, Qiu-Qi Guo, Aoxin Cai, Xin Qin, Yang-Yang Fang, Xin-Yu Peng, Li-Cong Feng, Chao Xu, Li-Wen Xiao, Xiong Liu, Xue-Wei |
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Article |
author |
Mu, Qiu-Qi Guo, Aoxin Cai, Xin Qin, Yang-Yang Fang, Xin-Yu Peng, Li-Cong Feng, Chao Xu, Li-Wen Xiao, Xiong Liu, Xue-Wei |
author_sort |
Mu, Qiu-Qi |
title |
Reversible-hydrogen-transfer-mediated anomerization of azaheterocyclyl 2-deoxy-C-glycosides and mechanistic studies |
title_short |
Reversible-hydrogen-transfer-mediated anomerization of azaheterocyclyl 2-deoxy-C-glycosides and mechanistic studies |
title_full |
Reversible-hydrogen-transfer-mediated anomerization of azaheterocyclyl 2-deoxy-C-glycosides and mechanistic studies |
title_fullStr |
Reversible-hydrogen-transfer-mediated anomerization of azaheterocyclyl 2-deoxy-C-glycosides and mechanistic studies |
title_full_unstemmed |
Reversible-hydrogen-transfer-mediated anomerization of azaheterocyclyl 2-deoxy-C-glycosides and mechanistic studies |
title_sort |
reversible-hydrogen-transfer-mediated anomerization of azaheterocyclyl 2-deoxy-c-glycosides and mechanistic studies |
publishDate |
2023 |
url |
https://hdl.handle.net/10356/170264 |
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1779156770248196096 |