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Efficient Synthesis of β-D-Mannosides and β-D-Talosides by Double Parallel or Double Serial Inversion
KTH, Skolan för kemivetenskap (CHE), Kemi.
KTH, Skolan för kemivetenskap (CHE), Kemi.
KTH, Skolan för kemivetenskap (CHE), Kemi.
KTH, Skolan för kemivetenskap (CHE), Kemi.
Vise andre og tillknytning
2007 (engelsk)Inngår i: Journal of Organic Chemistry, ISSN 0022-3263, E-ISSN 1520-6904, Vol. 72, nr 10, s. 3694-3701Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A neighboring equatorial ester group plays a highly important role in the Lattrell-Dax (nitrite-mediated) carbohydrate epimerization reaction, inducing the formation of inversion compounds in good yields. On the basis of this effect, efficient synthetic routes to beta-D-mannosides and beta-D-talosides, from the corresponding beta-D-galactosides and beta-D-glucosides, have been designed. The present routes are based on multiple regioselective acylation via the respective stannylene intermediates, followed by inversions to the corresponding manno- and talopyranoside structures by nitrite or acetate substitution. It was found that the ester group was able to induce the inversion of its two neighboring groups in high yields following either a double parallel or a double serial inversion process. By combination of direct inversion, and neighboring- as well as remote-group participation, several beta-D-mannoside and beta-D-taloside derivatives were very conveniently obtained in good yields.

sted, utgiver, år, opplag, sider
2007. Vol. 72, nr 10, s. 3694-3701
Emneord [en]
INTRAMOLECULAR AGLYCON DELIVERY; STEREOSELECTIVE-SYNTHESIS; CORE PENTASACCHARIDE; D-MANNOPYRANOSIDES; N-GLYCANS; CHEMOENZYMATIC SYNTHESIS; LINKED GLYCOPROTEINS; PRACTICAL SYNTHESIS; CHEMICAL-SYNTHESIS; NITRITE ANIONS
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-9886DOI: 10.1021/jo062643oISI: 000246206700013PubMedID: 17439283Scopus ID: 2-s2.0-34248573311OAI: oai:DiVA.org:kth-9886DiVA, id: diva2:139846
Merknad

QC 20100709

Tilgjengelig fra: 2009-01-27 Laget: 2009-01-27 Sist oppdatert: 2020-03-09bibliografisk kontrollert
Inngår i avhandling
1. Efficient Carbohydrate Synthesis By Intra- and Supramolecular Control
Åpne denne publikasjonen i ny fane eller vindu >>Efficient Carbohydrate Synthesis By Intra- and Supramolecular Control
2009 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The Lattrell-Dax method of nitrite-mediated substitution of carbohydrate triflates is an efficient method to generate structures of inverse configuration. In this study, the effects of the neighboring group on the Lattrell-Dax inversion were explored. A new carbohydrate/anion host-guest system was discovered and the ambident reactivity of the nitrite anion was found to cause a complicated behavior of the reaction. It has been demonstrated that a neighboring equatorial ester group plays a highly important role in this carbohydrate epimerization reaction, restricting the nitrite N-attack, thus resulting in O-attack only and inducing the formation of inversion compounds in good yields. Based on this effect, efficient synthetic routes to a range of carbohydrate structures, notably β-D-mannosides and β-D-talosides, were designed by use of double parallel and double serial inversion. A supramolecularly activated, triggered cascade reaction was also developed. This cascade reaction is triggered by a deprotonation process that is activated by anions. It was found that the anions can activate this reaction following their hydrogen bonding tendencies to the hydroxyl group in aprotic solvents.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2009. s. 59
Serie
Trita-CHE-Report, ISSN 1654-1081 ; 2009:2
Emneord
Carbohydrate Chemistry, Supramolecular Control, Ambident Reactivity
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-9882 (URN)978-91-7415-207-4 (ISBN)
Disputas
2009-02-05, F3, KTH, Lindstedtsvägen 26, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad
QC 20100709Tilgjengelig fra: 2009-01-27 Laget: 2009-01-26 Sist oppdatert: 2019-12-20bibliografisk kontrollert
2. Efficient carbohydrate synthesis by controlled inversion strategies
Åpne denne publikasjonen i ny fane eller vindu >>Efficient carbohydrate synthesis by controlled inversion strategies
2006 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The Lattrell-Dax method of nitrite-mediated substitution of carbohydrate triflates is an efficient method to generate structures of inverse configuration. In this study it has been demonstrated that a neighboring equatorial ester group plays a highly important role in this carbohydrate epimerization reaction, inducing the formation of inversion compounds in good yields. Based on this effect, efficient synthetic routes to a range of carbohydrate structures, notably β-D-mannosides and β-D-talosides, were designed. By use of the ester activation effect for neighboring groups, a double parallel as well as a double serial inversion strategy was developed.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2006. s. 40
Serie
Trita-IOK, ISSN 1100-7974 ; 107
Emneord
Carbohydrate Chemistry, Carbohydrate Protection, Epimerization, Inversion, Dynamic, Regioselective Control, Neighboring Group Participation
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-4179 (URN)91-7178-502-7 (ISBN)
Presentation
2006-11-30, E2, KTH, Lindstedtsvägen 3, Stockholm, 10:00
Veileder
Merknad
QC 20101111Tilgjengelig fra: 2006-11-22 Laget: 2006-11-22 Sist oppdatert: 2010-11-11bibliografisk kontrollert

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