Hexane → 4-(9-Hydroxynonyl)-7-methoxymethoxy-3-(4-methoxymethoxyphenyl)-3-methylchroman

HRID 1792338Notes

Reaction equation

HRID 1792338 reaction equation
[Si]([O:8][CH2:9][CH2:10][CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH:18]1[C:27]2[C:22](=[CH:23][C:24]([O:28][CH2:29][O:30][CH3:31])=[CH:25][CH:26]=2)[O:21][CH2:20][C:19]1([C:33]1[CH:38]=[CH:37][C:36]([O:39][CH2:40][O:41][CH3:42])=[CH:35][CH:34]=1)[CH3:32])(C(C)(C)C)(C)C.CC1C=CC(S([O-])(=O)=O)=CC=1.C1C=C[NH+]=CC=1.CCCCCC.C(OCC)(=O)C>CO>[OH:8][CH2:9][CH2:10][CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH:18]1[C:27]2[C:22](=[CH:23][C:24]([O:28][CH2:29][O:30][CH3:31])=[CH:25][CH:26]=2)[O:21][CH2:20][C:19]1([C:33]1[CH:34]=[CH:35][C:36]([O:39][CH2:40][O:41][CH3:42])=[CH:37][CH:38]=1)[CH3:32]

Participants

6

Reactant 4

HCID 8058HexaneHCID 8857Ethyl AcetateHCID 466102Benzenesulfonic acid, 4-methyl-, compd. with pyridine (1:1)HCID 220330064-[9-(t-Butyldimethylsilyloxy)nonyl]-7-methoxymethoxy-3-(4-methoxymethoxyphenyl)-3-methylchroman

Product 1

HCID 154817594-(9-Hydroxynonyl)-7-methoxymethoxy-3-(4-methoxymethoxyphenyl)-3-methylchromanYield 77%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

4-[9-(t-Butyldimethylsilyloxy)-nonyl]-7-methoxymethoxy-3-(4-methoxymethoxyphenyl)-3-methylchroman (0.62 g, 11.0 mmol) was dissolved in methanol (30 ml), PPTS (0.70 g) was added thereto, and the mixture was stirred at room temperature for 4 hours. After the reaction was completed, the reaction mixture was concentrated under reduced pressure. The residue was poured into water and extracted with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate, and concentrated under reduced pressure to give a crude product. This crude product thus obtained was subjected to silica gel column chromatography (n-hexane:ethyl acetate=2:1) to give 4-(9-hydroxynonyl)-7-methoxymethoxy-3-(4-methoxymethoxyphenyl)-3-methylchroman (a mixture of (3RS,4RS) and (3RS,4SR), (3RS,4RS)/(3RS,4SR)=about 6/1, 370 mg, yield 77%). This compound thus obtained was dissolved in dichloromethane (20 ml), methanesulfonylchloride (0.40 g) and triethylamine (0.38 g) were added thereto, and the mixture was stirred at room temperature for 1 hour. After the reaction was completed, the reaction mixture was poured into water and extracted with chloroform. The organic layer was dried over anhydrous magnesium sulfate, and concentrated under reduced pressure to give a crude product. This crude product thus obtained was subjected to preparative TLC using n-hexane/ethyl acetate (5/1 for 6 times) to produce (3RS,4RS)-4-(9-methanesulfonyloxynonyl)-7-methoxymethoxy-3-(4-methoxymethoxyphenyl)-3-methylchroman (241 mg, yield 56%).

Workup

  1. concentrationthe reaction mixture was concentrated under reduced pressure
  2. additionThe residue was poured into water
  3. extractionextracted with ethyl acetate
  4. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
  5. concentrationconcentrated under reduced pressure
  6. customto give a crude product
  7. customThis crude product thus obtained

Sources & evidence

ORD record
ord-a09ed64c63b94387ac2d265da04ec011
Source dataset
uspto-grants-2006_07
Patent number
US07074819B2

Reaction notes

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