Water → (3RS,4RS)-4-[3-(4-chlorobutyloxy)phenyl]-7-methoxymethyloxy-3-[4-(methoxymethyloxy)phenyl]-3-methyl-2,3-dihydro-4H-benzopyran

HRID 1859320Notes

Reaction equation

HRID 1859320 reaction equation
[OH:1][C:2]1[CH:3]=[C:4]([CH:8]2[C:13]3[CH:14]=[CH:15][C:16]([O:18][CH2:19][O:20][CH3:21])=[CH:17][C:12]=3[O:11][CH2:10][C:9]2([C:23]2[CH:28]=[CH:27][C:26]([O:29][CH2:30][O:31][CH3:32])=[CH:25][CH:24]=2)[CH3:22])[CH:5]=[CH:6][CH:7]=1.Br[CH2:34][CH2:35][CH2:36][CH2:37][Cl:38].[OH-].[Na+].O>CC(C)=O>[Cl:38][CH2:37][CH2:36][CH2:35][CH2:34][O:1][C:2]1[CH:3]=[C:4]([CH:8]2[C:13]3[CH:14]=[CH:15][C:16]([O:18][CH2:19][O:20][CH3:21])=[CH:17][C:12]=3[O:11][CH2:10][C:9]2([C:23]2[CH:24]=[CH:25][C:26]([O:29][CH2:30][O:31][CH3:32])=[CH:27][CH:28]=2)[CH3:22])[CH:5]=[CH:6][CH:7]=1

Participants

6

Reactant 4

HCID 962WaterHCID 14798Sodium HydroxideHCID 813641-Bromo-4-chlorobutaneHCID 22123578(3RS,4RS)-4-(3-hydroxyphenyl)-7-methoxymethyloxy-3-[4-(methoxymethyloxy)phenyl]-3-methyl-2,3-dihydro-4H-benzopyran

Product 1

HCID 22123573(3RS,4RS)-4-[3-(4-chlorobutyloxy)phenyl]-7-methoxymethyloxy-3-[4-(methoxymethyloxy)phenyl]-3-methyl-2,3-dihydro-4H-benzopyranYield 96.5%

Reagents, catalysts & solvents 1

HCID 180AcetoneSolvent

Conditions

Temperature
50 °C

Procedure

(3RS,4RS)-4-(3-Hydroxyphenyl)-7-methoxymethyloxy-3-[4-(methoxymethyloxy)phenyl]-3-methyl-2,3-dihydro-4H-benzopyran (260 mg, 0.59 mmol), 1-bromo-4-chlorobutane (0.8 ml, 2.98 mmol) and aqueous 2N-NaOH solution (0.8 ml) were dissolved in acetone (10 ml) and then stirred for 4 hours at 50° C. The reaction mixture was cooled to room temperature and then water was added thereto. The reaction solution was extracted with ethyl acetate and the organic layer was dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure to remove the organic solvent. The concentrate was separated by column chromatography (n-hexane:ethyl acetate=4:1) to obtain 300 mg (yield: 96%) of the title compound as a colorless oil.

Workup

  1. temperatureThe reaction mixture was cooled to room temperature
  2. extractionThe reaction solution was extracted with ethyl acetate
  3. dry with materialthe organic layer was dried over anhydrous magnesium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated under reduced pressure
  6. customto remove the organic solvent
  7. customThe concentrate was separated by column chromatography (n-hexane:ethyl acetate=4:1)

Sources & evidence

ORD record
ord-586d4e1246954f71ab13da87f0b9c5b0
Source dataset
uspto-grants-2000_11
Patent number
US06153768

Reaction notes

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