N-Hydroxyphthalimide → 5'-O-(t-Butyldimethylsilyl)-3'-O-Phthalimidothymidine

HRID 482121

Reaktionsgleichung

Reaktionsgleichung von HRID 482121
[Si:1]([O:8][CH2:9][C@H:10]1[O:14][C@@H:13]([N:15]2[CH:23]=[C:21]([CH3:22])[C:19](=[O:20])[NH:18][C:16]2=[O:17])[CH2:12][C@@H:11]1[OH:24])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.O[N:45]1[C:49](=[O:50])[C:48]2=[CH:51][CH:52]=[CH:53][CH:54]=[C:47]2[C:46]1=[O:55].CC(OC(/N=N/C(OC(C)C)=O)=O)C>C1COCC1.CCOCC>[Si:1]([O:8][CH2:9][C@H:10]1[O:14][C@@H:13]([N:15]2[CH:23]=[C:21]([CH3:22])[C:19](=[O:20])[NH:18][C:16]2=[O:17])[CH2:12][C@@H:11]1[O:24][N:45]1[C:46](=[O:55])[C:47]2=[CH:54][CH:53]=[CH:52][CH:51]=[C:48]2[C:49]1=[O:50])([C:4]([CH3:7])([CH3:5])[CH3:6])([CH3:2])[CH3:3]

Komponenten

7

Edukt 4

HCID 10665N-HydroxyphthalimideHCID 11776TriphenylphosphineHCID 5363146Diisopropyl azodicarboxylateHCID 102512595'-O-tert-Butyldimethylsilylthymidine

Produkt 1

HCID 186587155'-O-(t-Butyldimethylsilyl)-3'-O-PhthalimidothymidineAusbeute 62 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 3283Diethyl EtherLösungsmittel2×HCID 8028TetrahydrofuranLösungsmittel

Reaktionsbedingungen

Temperatur
0 °C

Versuchsvorschrift

To a solution of 5'-O-t-butyldimethylsilylthymidine [1, 21.36 g, 60 mmol, prepared according to the procedure of Nair, et al., Org. Prep. Procedures Int. 1990, 22, 57 in dry THF (750 ml)], triphenylphosphine (17.28 g, 66 mmol) and N-hydroxyphthalimide (10.74 g, 66 mmol) were added. The solution was cooled to 0° C. and diisopropylazodicarboxylate (15.15 g, 75 mmol) was added dropwise over a period of 3 hr while stirring under nitrogen. The reaction mixture was then stirred at room temperature for 12 hr. The solution was evaporated and the residue was dissolved in CH2 Cl2 (750 ml), extracted with sat. NaHCO3 (200 ml), and water (200 ml), dried (MgSO4), filtered and concentrated to furnish yellow oily residue. Silica gel column chromatography (100% hexanes, and then hexanes:Et2O gradient to 90% Et2O) of the residue gave compound 2 as a colorless glass (18.68 g, 62%); 1H NMR (CDCl3) δ 0.05 [2s, 6, (CH3)2 ], 0.91 [s, 9, (CH3)3 ], 2.0 (s, 3, CH3), 2.5-2.65 (m, 2, 2'CH2), 4.05-4.2 (m, 2, 5'CH2), 4.25-4.35 (m, 1, 4'H), 5.0 (m, 1, 3'H), 6.15 (m, 1'H), 8.6 (br s, 1, NH), and aromatic protons. Anal. Calcd. for C24H3 N3O7Si: C, 57.46;H, 6.23; N, 8.37. found : C, 57.20; H, 6.26; N, 8.27.

Aufarbeitung

  1. stirringThe reaction mixture was then stirred at room temperature for 12 hr
  2. customThe solution was evaporated
  3. dissolutionthe residue was dissolved in CH2 Cl2 (750 ml)
  4. extractionextracted with sat. NaHCO3 (200 ml), and water (200 ml)
  5. dry with materialdried (MgSO4)
  6. filtrationfiltered
  7. concentrationconcentrated
  8. customto furnish yellow oily residue

Quellen und Nachweise

ORD-Eintrag
ord-2fd7300385de4d3a977b00ad76428de4
Quelldatensatz
uspto-grants-1998_08
Patentnummer
US05792844

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