Triethylamine → 1-O-methyl 5-(t-butyldiphenylsilyl)-beta-D-ribofuranoside

HRID 965189

Reaction equation

HRID 965189 reaction equation
[CH3:1][O:2][CH:3]1[O:7][CH:6]([CH2:8][OH:9])[CH:5]([OH:10])[CH:4]1[OH:11].C(N(CC)CC)C.[C:19]([Si:23]([C:31]1[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=1)([C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1)Cl)([CH3:22])([CH3:21])[CH3:20]>CN(C1C=CN=CC=1)C.C(Cl)Cl>[Si:23]([CH:8]([OH:9])[C@H:6]1[O:7][C@@H:3]([O:2][CH3:1])[C@H:4]([OH:11])[C@@H:5]1[OH:10])([C:19]([CH3:22])([CH3:21])[CH3:20])([C:31]1[CH:32]=[CH:33][CH:34]=[CH:35][CH:36]=1)[C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1

Participants

6

Reactant 3

HCID 8471TriethylamineHCID 94078tert-ButyldiphenylchlorosilaneHCID 255320beta-D-Ribofuranoside, methyl

Product 1

HCID 186611941-O-methyl 5-(t-butyldiphenylsilyl)-beta-D-ribofuranosideYield 54.8%

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 6344DichloromethaneSolvent

Procedure

To a mixture of methyl-β-D-ribofuranoside (460 mg, 2.8 mmol, Sigma, St. Louis, Mo.) and anhydrous methylene chloride (20 ml) were added triethylamine (0.468 ml, 3.36 mmol), t-butyldiphenylchlorosilane (0.9 ml, 3.46 mmol), and DMAP (13.7 mg, 0.112 mmol) successively at room temperature. The reaction mixture was stirred at room temperature for 18 h under nitrogen. It was washed with water (20 ml), saturated ammonium chloride (20 ml), and brine (20 ml), dried over anhydrous MgSO4, filtered, and concentrated to dryness. The residue was separated by silica gel column chromatography (CHCl3 --MeOH, 50:1) to yield 1-O-methyl 5-(t-butyldiphenylsilyl)-β-D-ribofuranoside (618 mg, 54.8%) as a thick syrup. 1H NMR (DMSO-d6) δ0.96 (s, 9H, t-Bu), 3.22 (s, 3H, --OCH3), 3.61 (dd, J=11.0 and 5.3 Hz, 1H), 3.74 (d, J=4.4 Hz, 1H), 3.81 (dd, J=11.0 and 2.7 Hz, 1H), 3.90 (m, 1H), 4.00 (m, 1H), 4.68 (s, 1H, H-1'), 4.84 (br s, 1H, exchangeable with D2O, OH), 5.05 (br s, 1H, exchangeable with D2O, OH), 7.45 and 7.67 (m, 10H, Ph2).

Workup

  1. washIt was washed with water (20 ml), saturated ammonium chloride (20 ml), and brine (20 ml)
  2. dry with materialdried over anhydrous MgSO4
  3. filtrationfiltered
  4. concentrationconcentrated to dryness
  5. customThe residue was separated by silica gel column chromatography (CHCl3 --MeOH, 50:1)

Sources & evidence

ORD record
ord-cc6db687f40b491d97054a1245c8cf35
Source dataset
uspto-grants-1998_06
Patent number
US05773423

Linked notes

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