Water → 4-[9-(t-Butyldimethylsilyloxy)-1-nonynyl]-7-methoxymethoxy-3-(4-methoxymethoxyphenyl)-3-methylchroman

HRID 1792337Notes

Reaction equation

HRID 1792337 reaction equation
[Si:1]([O:8][CH2:9][CH2:10][CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][C:16]#[C:17][C:18]1(O)[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:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].C([BH3-])#N.[Na+].O.CCCCCC>ClCCCl.C(OCC)(=O)C>[Si:1]([O:8][CH2:9][CH2:10][CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][C:16]#[C: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:4]([CH3:7])([CH3:6])[CH3:5])([CH3:2])[CH3:3]

Participants

7

Reactant 4

HCID 962WaterHCID 8058HexaneHCID 5003444Sodium cyanoborohydrideHCID 220330974-[9-(t-Butyldimethylsilyloxy)-1-nonynyl]4-hydroxy-7-methoxymethoxy-3-(4-methoxymethoxyphenyl)-3-methylchroman

Product 1

HCID 220331314-[9-(t-Butyldimethylsilyloxy)-1-nonynyl]-7-methoxymethoxy-3-(4-methoxymethoxyphenyl)-3-methylchromanYield 52%

Reagents, catalysts & solvents 2

HCID 111,2-DichloroethaneSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a solution of 4-[9-(t-butyldimethylsilyloxy)-1-nonynyl]4-hydroxy-7-methoxymethoxy-3-(4-methoxymethoxyphenyl)-3-methylchroman (116 g, 1.9 mmol) in 1,2-dichloroethane (50 ml) were added zinc iodide(II) (0.7 g) and sodium cyanoborohydride (0.6 g), which was then stirred at room temperature for 4 hours. 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 silica gel column chromatography (n-hexane:ethyl acetate=5:1) to give 4-[9-(t-butyldimethylsilyloxy)-1-nonynyl]-7-methoxymethoxy-3-(4-methoxymethoxyphenyl)-3-methylchroman (a mixture of (3RS,4RS) and (3RS,4SR), (3RS,4RS)/(3RS,4SR)=about 6/1) (590 mg, yield 52%). Then, this compound thus obtained was dissolved in methanol (50 ml) and tetrahydrofuran (10 ml), 10% palladium on carbon (0.23%) was added thereto, and the resulting mixture was stirred at room temperature under hydrogen for 20 hours. The reaction solution was filtered through cellite and concentrated under reduced pressure to give 4-(9-(t-butyldimethylsilyloxy)-nonyl)-7-methoxymethoxy-3-(4-methoxymethoxyphenyl)-3-methylchroman (crude product, 640 mg, stoichiometric yield, a mixture of (3RS,4RS) and (3RS,4SR), (3RS,4RS)/(3RS,4SR)=about 6/1).

Workup

  1. extractionextracted with chloroform
  2. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
  3. concentrationconcentrated under reduced pressure
  4. customto give a crude product
  5. customThis crude product thus obtained

Sources & evidence

ORD record
ord-a6cfff8ca16e485880122d3911b38ed1
Source dataset
uspto-grants-2006_07
Patent number
US07074819B2

Reaction notes

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