Triphenylphosphine → 6-[(2,3,4-tri-O-acetyl-5-thio-beta-D-xylopyranosyl)oxy]-1H-indole-1-carboxylic Acid, 1,1-dimethylethyl Ester

HRID 1993732Notes

Reaction equation

HRID 1993732 reaction equation
[C:1]([O:5][C:6]([N:8]1[C:16]2[C:11](=[CH:12][CH:13]=[C:14]([OH:17])[CH:15]=2)[CH:10]=[CH:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].CC(OC(/N=N/C(OC(C)C)=O)=O)C.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[C:51]([O:54][C@@H:55]1[C@@H:61]([O:62][C:63](=[O:65])[CH3:64])[C@H:60]([O:66][C:67](=[O:69])[CH3:68])[CH2:59][S:58][CH:56]1O)(=[O:53])[CH3:52]>C1COCC1>[C:51]([O:54][C@@H:55]1[C@@H:61]([O:62][C:63](=[O:65])[CH3:64])[C@H:60]([O:66][C:67](=[O:69])[CH3:68])[CH2:59][S:58][C@H:56]1[O:17][C:14]1[CH:15]=[C:16]2[C:11]([CH:10]=[CH:9][N:8]2[C:6]([O:5][C:1]([CH3:4])([CH3:2])[CH3:3])=[O:7])=[CH:12][CH:13]=1)(=[O:53])[CH3:52]

Participants

6

Reactant 4

HCID 11776TriphenylphosphineHCID 5363146Diisopropyl azodicarboxylateHCID 150678682,3,4-tri-O-acetyl-5-thio-D-xylopyranoseHCID 24728908tert-Butyl 6-hydroxy-1H-indole-1-carboxylate

Product 1

HCID 866301236-[(2,3,4-tri-O-acetyl-5-thio-beta-D-xylopyranosyl)oxy]-1H-indole-1-carboxylic Acid, 1,1-dimethylethyl EsterYield 3%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Conditions

Temperature
50 °C

Procedure

A solution of 2.66 g (11.41 mM) of 6-hydroxy-1H-indole-1-carboxylic acid tert-butyl ester in 50 ml of THF, 4.16 g (20.6 mM) of diisopropylazodicarboxylate and 5.39 g (20.6 mM) of triphenylphosphine are added to a solution of 4.34 g (14.84 mM) of 2,3,4-tri-O-acetyl-5-thio-D-xylopyranose in 150 ml of THF. The reaction mixture is stirred at 50° C. for 4 hours and then concentrated under reduced pressure. The evaporation residue is solubilized in ethyl acetate and the organic phase is washed with a 1N solution of sodium hydroxide and then with a concentrated aqueous solution of ammonium chloride. The organic phase is subsequently dried over magnesium sulfate and concentrated under reduced pressure. The evaporation residue is purified by silica gel chromatography, elution being carried out with a methylcyclohexane/ethyl acetate mixture (gradient of 9/1 to 7/3; v/v). The residue obtained is subsequently purified by C18-grafted silica chromatography, elution being carried out with an acetonitrile/water mixture (6/4; v/v). The desired product is obtained in the form of a white solid with a yield of 3%.

Workup

  1. concentrationconcentrated under reduced pressure
  2. washthe organic phase is washed with a 1N solution of sodium hydroxide
  3. dry with materialThe organic phase is subsequently dried over magnesium sulfate
  4. concentrationconcentrated under reduced pressure
  5. customThe evaporation residue is purified by silica gel chromatography, elution
  6. customThe residue obtained
  7. customis subsequently purified by C18-grafted silica chromatography, elution

Sources & evidence

ORD record
ord-cbbbead4d6da43a09b0fdfcb11960157
Source dataset
uspto-grants-2010_01
Patent number
US07652032B2

Reaction notes

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