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León EI, Martín Á, Montes AS, Pérez-Martín I, Del Sol Rodríguez M, Suárez E. 1,5-Hydrogen Atom Transfer/Surzur-Tanner Rearrangement: A Radical Cascade Approach for the Synthesis of 1,6-Dioxaspiro[4.5]decane and 6,8-Dioxabicyclo[3.2.1]octane Scaffolds in Carbohydrate Systems. J Org Chem 2021; 86:14508-14552. [PMID: 34554734 PMCID: PMC8576821 DOI: 10.1021/acs.joc.1c01376] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
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The 1,5-HAT–1,2-(ester)alkyl
radical migration (Surzur–Tanner
rearrangement) radical/polar sequence triggered by alkoxyl radicals
has been studied on a series of C-glycosyl substrates
with 3-C-(α,β-d,l-glycopyranosyl)1-propanol
and C-(α-d,l-glycopyranosyl)methanol
structures prepared from chiral pool d- and l-sugar.
The use of acetoxy and diphenoxyphosphatoxy as leaving groups provides
an efficient construction of 10-deoxy-1,6-dioxaspiro[4.5]decane and
4-deoxy-6,8-dioxabicyclo[3.2.1]octane frameworks. The alkoxyl radicals
were generated by the reaction of the corresponding N-alkoxyphthalimides with group 14 hydrides [n-Bu3SnH(D) and (TMS)3SiH], and in comparative terms,
the reaction was also initiated by visible light photocatalysis using
the Hantzsch ester/fac-Ir(ppy)3 procedure.
Special attention was devoted to the influence of the relative stereochemistry
of the centers involved in the radical sequence on the reaction outcome.
The addition of BF3•Et2O as a catalyst
to the radical sequence resulted in a significant increase in the
yields of the desired bicyclic ketals.
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Affiliation(s)
- Elisa I León
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC, Avda. Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - Ángeles Martín
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC, Avda. Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - Adrián S Montes
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC, Avda. Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain.,Doctoral and Postgraduate School, Universidad de La Laguna, Avda. Astrofísico Francisco Sánchez s/n, 38200 La Laguna, Tenerife, Spain
| | - Inés Pérez-Martín
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC, Avda. Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - María Del Sol Rodríguez
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC, Avda. Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - Ernesto Suárez
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC, Avda. Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
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Suh CE, Carder HM, Wendlandt AE. Selective Transformations of Carbohydrates Inspired by Radical-Based Enzymatic Mechanisms. ACS Chem Biol 2021; 16:1814-1828. [PMID: 33988380 DOI: 10.1021/acschembio.1c00190] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Enzymes are a longstanding source of inspiration for synthetic reaction development. However, enzymatic reactivity and selectivity are frequently untenable in a synthetic context, as the principles that govern control in an enzymatic setting often do not translate to small molecule catalysis. Recent synthetic methods have revealed the viability of using small molecule catalysts to promote highly selective radical-mediated transformations of minimally protected sugar substrates. These transformations share conceptual similarities with radical SAM enzymes found in microbial carbohydrate biosynthesis and present opportunities for synthetic chemists to access microbial and unnatural carbohydrate building blocks without the need for protecting groups or lengthy synthetic sequences. Here, we highlight strategies through which radical reaction pathways can enable the site-, regio-, and diastereoselective transformation of minimally protected carbohydrates in both synthetic and enzymatic systems.
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Affiliation(s)
- Carolyn E. Suh
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Hayden M. Carder
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Alison E. Wendlandt
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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Zard SZ. Some intriguing mechanistic aspects of the radical chemistry of xanthates. J PHYS ORG CHEM 2012. [DOI: 10.1002/poc.2976] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Samir Z. Zard
- Ecole Polytechnique; Laboratoire de Synthèse Organique, UMR 7652; 91128; Palaiseau; France
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Zipse H. Computational Insight into the Chemistry of β-(Phosphatoxy)alkyl Radicals: [3,2]- and [1,2]-Phosphatoxy Rearrangements and a New Pathway for syn-Elimination of Phosphate. J Am Chem Soc 1997. [DOI: 10.1021/ja9618762] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hendrik Zipse
- Contribution from the Institut für Organische Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, D-10623 Berlin, Germany
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Quiclet-Sire B, Zard SZ. An Unusual Route to Deoxysugars by Hydrogen Atom Transfer from Cyclohexane. Possible Manifestation of Polar Effects in a Radical Process. J Am Chem Soc 1996. [DOI: 10.1021/ja9619622] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Béatrice Quiclet-Sire
- Institut de Chimie des Substances Naturelles CNRS, 91198 Gif-sur-Yvette, France Laboratoire de Synthèse Organique associé au CNRS Ecole Polytechnique, 91128 Palaiseau, France
| | - Samir Z. Zard
- Institut de Chimie des Substances Naturelles CNRS, 91198 Gif-sur-Yvette, France Laboratoire de Synthèse Organique associé au CNRS Ecole Polytechnique, 91128 Palaiseau, France
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Crich D, Beckwith ALJ, Filzen GF, Longmore RW. Free Radical Chemistry of Lactones: Ring Contractions and Expansions. J Am Chem Soc 1996. [DOI: 10.1021/ja960471e] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- David Crich
- Department of Chemistry (M/C 111) University of Illinois at Chicago 845 W. Taylor Street, Chicago, Illinois 60607-7061 Research School of Chemistry The Australian National University Canberra, ACT 0200, Australia
| | - Athelstan L. J. Beckwith
- Department of Chemistry (M/C 111) University of Illinois at Chicago 845 W. Taylor Street, Chicago, Illinois 60607-7061 Research School of Chemistry The Australian National University Canberra, ACT 0200, Australia
| | - G. Fredrick Filzen
- Department of Chemistry (M/C 111) University of Illinois at Chicago 845 W. Taylor Street, Chicago, Illinois 60607-7061 Research School of Chemistry The Australian National University Canberra, ACT 0200, Australia
| | - Robert W. Longmore
- Department of Chemistry (M/C 111) University of Illinois at Chicago 845 W. Taylor Street, Chicago, Illinois 60607-7061 Research School of Chemistry The Australian National University Canberra, ACT 0200, Australia
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Cettour P, Descotes G, Praly JP. N-Bromosuccinimide-Mediated Transformation of Acetylated 1,5-Anhydro-1-C-phenyl-d-hexitols. J Carbohydr Chem 1995. [DOI: 10.1080/07328309508002084] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Müller T, Schneider R, Schmidt RR. Utility of glycosyl phosphites as glycosyl donors-fructofuranosyl and 2-deoxyhexopyranosyl phosphites in glycoside bond formation. Tetrahedron Lett 1994. [DOI: 10.1016/s0040-4039(00)76961-9] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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