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p-Toluenesulfonic acid → Benzyl 2.6-di-O-benzoyl-4-O-(4-O-acetyl-2,6-di-O-benzoyl-beta-D-galactopyranosyl)-3-O-(2,3,4-tri-O-benzyl-alpha-L-fucopyranosyl)-beta-D-glucopyranoside

HRID 233379
Notizen
Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 233379
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KomponentenVersuchsvorschriftAufarbeitungQuellen und NachweiseNotizen zur Reaktion

Komponenten

6

Edukt 3

HCID 6101p-Toluenesulfonic acidHCID 8471TriethylamineHCID 22868658Benzyl 2,6-di-O-benzoyl-3-O-(2,3,4-tri-O-benzyl-alpha-L-fucopyranosyl)-4-O-(2,6-di-O-benzoyl-beta-D-galactopyranosyl)-beta-D-glucopyranoside

Produkt 1

HCID 86750150Benzyl 2.6-di-O-benzoyl-4-O-(4-O-acetyl-2,6-di-O-benzoyl-beta-D-galactopyranosyl)-3-O-(2,3,4-tri-O-benzyl-alpha-L-fucopyranosyl)-beta-D-glucopyranoside
Ausbeute 96,6 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 241BenzeneLösungsmittelHCID 21875354TriethylorthoaceateLösungsmittel

Versuchsvorschrift

Compound 10b (0.56 g) was dissolved in a mixture of benzene (30 mL) and triethylorthoacetate (30 mL), containing 4-toluenesulfonic acid (0.15 g), and the mixture stirred for 1 h at room temperature. The acid was neutralized with a little triethylamine, and the mixture evaporated to dryness. It was then taken in 80% aqueous acetic acid (50 mL) and stirred for 40 min at room temperature. T.l.c. (4:1 toluene-ethyl acetate) showed the presence of a major product,faster-migrating than diol 10b. The acetic acid was removed under diminished pressure, and several portion of toluene were added to, and evaporated from the residue to furnish 11b (0.56 g, 96.6%) as an amorphous solid, [α]D -14.3° (c,1.1, chloroform). 1H NMR (CDCl3): δ8.20-7.00 (m, 40 H, arom.), 5.51 (t, 1 H, J 8.0 Hz, H-2'), 5.38 (d, 1 H, J 3.8 Hz, H-1 fuc), 5.30 (d, 1 H, J 3.8 Hz, H-4'), 5.20 (dd, 1 H, J 8.1 and 10.0 Hz, H-2), 4.62 (d, 1 H, J 8.2 Hz, H-1), 4.44 (d, 1 H, J 7.9 Hz, H-1'), 1.82 (s, 3 H, CH3CO), and 1.34 (d, 3 H, J 6.4 Hz, H-6 fuc). 13C NMR (CDCl3): δ170.38 (CH3CO), 166.15, 165.72, 165.57, 164.56 (4×PhCO), 100.45, 99.23 (C-1, C-1'), 97.54 C-1 fuc), 79.48 (C-3), 77.57 (C-4), 74.08, 72.94, 72.70, 70.15 (4×PhCH2), 62.54, 60.78 (C-6, C-6'), 20.59 (CH3CO), and 16.88 (C-6 fuc); positive ion LSIMS: 1307.1 (M+H)+), 1200.8 (M-OBn)+, negative ion LSIMS: 1460.9 (M+mNBA)-, 1353.6 (M+NO2)-, 1306.8 (M-H)-.

Aufarbeitung

  1. customthe mixture evaporated to dryness
  2. stirringstirred for 40 min at room temperature
  3. customThe acetic acid was removed under diminished pressure, and several portion of toluene
  4. additionwere added to, and
  5. customevaporated from the residue

Quellen und Nachweise

ORD-Eintrag
ord-00491fa86f9d4e2f925b372ccd963a83
Quelldatensatz
uspto-grants-1997_01
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US05591835

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