Ammonium Chloride → (3R,7R,11R)-1-(2',5'-dimethoxy-3',4',6'-trimethylphenyl)-3,7,11,15-tetramethylhexadecan-3-ol

HRID 1252547Notes

Reaction equation

HRID 1252547 reaction equation
[CH3:1][C@H:2]([CH2:6][CH2:7][CH2:8][C@H:9]([CH3:16])[CH2:10][CH2:11][CH2:12][CH:13]([CH3:15])[CH3:14])[CH2:3][CH2:4]Br.[Mg].[CH3:18][O:19][C:20]1[C:25]([CH3:26])=[C:24]([CH3:27])[C:23]([O:28][CH3:29])=[C:22]([CH3:30])[C:21]=1[CH2:31][CH2:32][C@:33]1([CH3:36])[O:35][CH2:34]1.[Cl-].[NH4+]>C(OCC)(=O)C>[CH3:18][O:19][C:20]1[C:25]([CH3:26])=[C:24]([CH3:27])[C:23]([O:28][CH3:29])=[C:22]([CH3:30])[C:21]=1[CH2:31][CH2:32][C@:33]([CH3:36])([OH:35])[CH2:34][CH2:4][CH2:3][C@H:2]([CH3:1])[CH2:6][CH2:7][CH2:8][C@H:9]([CH3:16])[CH2:10][CH2:11][CH2:12][CH:13]([CH3:15])[CH3:14]

Participants

6

Reactant 4

HCID 25517Ammonium ChlorideHCID 5462224MagnesiumHCID 13191851(3R,7R)-1-bromo-3,7,11-trimethyldodecaneHCID 18602184(S)-4-(2',5'-dimethoxy-3',4',6'-trimethylphenyl)-2-methyl-1,2-epoxy-butane

Product 1

HCID 14631375(3R,7R,11R)-1-(2',5'-dimethoxy-3',4',6'-trimethylphenyl)-3,7,11,15-tetramethylhexadecan-3-ol

Reagents, catalysts & solvents 1

HCID 8857Ethyl AcetateSolvent

Procedure

5.8 mmol of (3R,7R)-3,7,11-trimethyldodecyl bromide are heated at reflux for 1/4 hour in 20 ml of ethyl acetate with activated magnesium. Then, there are added at 0° C. 1 g of (S)-4-(2',5'-dimethoxy-3',4',6'-trimethylphenyl)-2-methyl-1,2-epoxybutane and 0.9 g of copper(I)-2-propylacetylide [or 1.2 g of copper(I) bromide/dimethyl sulphide complex]. The temperature of the reaction mixture is subsequently left to rise to room temperature and the mixture is stirred overnight. 10 ml of ammonium chloride are than added and the mixture is extracted with ethyl ether. The extract is dried and concentrated, and the residue is distilled in a bulb-tube (b.p.0.01 =140° C.). There are obtained 1.28 g (72%) [or 1.41 g (79%)] of (3R,7R,11R)-1-(2',5'-dimethoxy-3',4',6'-trimethylphenyl)-3,7,11,15-tetramethylhexadecan-3-ol as a colourless oil.

Workup

  1. additionThen, there are added at 0° C
  2. waitThe temperature of the reaction mixture is subsequently left
  3. customto rise to room temperature
  4. additionthan added
  5. extractionthe mixture is extracted with ethyl ether
  6. customThe extract is dried
  7. concentrationconcentrated
  8. distillationthe residue is distilled in a bulb-tube (b.p.0.01 =140° C.)

Sources & evidence

ORD record
ord-5b52af42d11f46f18bacc237f0110e3b
Source dataset
uspto-grants-1988_05
Patent number
US04743696

Reaction notes

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