Ammonium Chloride → (R)-4-benzyl-3-((R)-2-(4-methoxy-3-(3-methoxypropoxy)benzyl)-3-methylbutanoyl)oxazolidin-2-one

HRID 744836Notes

Reaction equation

HRID 744836 reaction equation
C[Si](C)(C)[N-][Si](C)(C)C.[Li+].[CH2:11]([C@@H:18]1[CH2:22][O:21][C:20](=[O:23])[N:19]1[C:24](=[O:29])[CH2:25][CH:26]([CH3:28])[CH3:27])[C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1.[CH3:30][O:31][C:32]1[CH:39]=[CH:38][C:35]([CH2:36]Br)=[CH:34][C:33]=1[O:40][CH2:41][CH2:42][CH2:43][O:44][CH3:45].[Cl-].[NH4+]>O1CCCC1>[CH2:11]([C@@H:18]1[CH2:22][O:21][C:20](=[O:23])[N:19]1[C:24](=[O:29])[C@@H:25]([CH:26]([CH3:27])[CH3:28])[CH2:36][C:35]1[CH:38]=[CH:39][C:32]([O:31][CH3:30])=[C:33]([O:40][CH2:41][CH2:42][CH2:43][O:44][CH3:45])[CH:34]=1)[C:12]1[CH:13]=[CH:14][CH:15]=[CH:16][CH:17]=1

Participants

6

Reactant 4

HCID 25517Ammonium ChlorideHCID 2733832Lithium HexamethyldisilazideHCID 11391340(4R)-4-Benzyl-3-(3-methylbutanoyl)-1,3-oxazolidin-2-oneHCID 115583294-(Bromomethyl)-1-methoxy-2-(3-methoxypropoxy)benzene

Product 1

HCID 22865790(R)-4-benzyl-3-((R)-2-(4-methoxy-3-(3-methoxypropoxy)benzyl)-3-methylbutanoyl)oxazolidin-2-one

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent3×

Conditions

Temperature
-70 °C

Procedure

600 ml of tetrahydrofuran are added to a solution of 600 ml of 1M lithium hexamethyl-disilazide and the mixture is stirred at -70° C. Then a solution of 156.6 g of 4(R)-benzyl-3-isovaleroyl-oxazolidin-2-one in 500 ml of tetrahydrofuran is added dropwise and the reaction mixture is stirred for a further 75 minutes at -70° C. Then a solution of 145 g of 4-methoxy-3-(3-methoxypropyloxy)-benzyl bromide in 500 ml of tetrahydrofuran is added dropwise. The temperature of the reaction mixture is allowed to rise from -70° to 0° C. over a period of 2 hours. The reaction mixture is left to stand for a further 18 hours at 4° C. and then, with stirring, 250 ml of saturated ammonium chloride solution are added. The tetrahydrofuran is evaporated off and the residue is extracted with ethyl acetate. The title compound is obtained from the residue of the extracts by purification by means of FC (2.4 kg of silica gel, ethyl acetate/hexane=1:1): Rf (ethyl acetate/hexane=1:2)=0.30; m.p. 55°-56° C.

Workup

  1. stirringthe reaction mixture is stirred for a further 75 minutes at -70° C
  2. waitThe reaction mixture is left
  3. waitto stand for a further 18 hours at 4° C.
  4. stirringwith stirring
  5. customThe tetrahydrofuran is evaporated off
  6. extractionthe residue is extracted with ethyl acetate

Sources & evidence

ORD record
ord-75851fa59aa04aa2be1ca20697a5227c
Source dataset
uspto-grants-1996_09
Patent number
US05559111

Reaction notes

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