4-Methylmorpholine → Ethyl (+/-)-4-(4-hydroxymethyl-1,3-oxazol-2-yl)-3-phenylbutanoate

HRID 989899Notes

Reaction equation

HRID 989899 reaction equation
[C:1]([C:4]1[N:5]=[C:6]([CH2:9][CH:10]([C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)[CH2:11][C:12]([O:14][CH2:15][CH3:16])=[O:13])[O:7][CH:8]=1)(O)=[O:2].CN1CCOCC1.ClC(OCC)=O.[BH4-].[Na+]>C1COCC1.CO>[OH:2][CH2:1][C:4]1[N:5]=[C:6]([CH2:9][CH:10]([C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)[CH2:11][C:12]([O:14][CH2:15][CH3:16])=[O:13])[O:7][CH:8]=1

Participants

7

Reactant 4

HCID 79724-MethylmorpholineHCID 10928Ethyl chloroformateHCID 4311764Sodium borohydrideHCID 11220404HCID 11220404, compound

Product 1

HCID 23389065Ethyl (+/-)-4-(4-hydroxymethyl-1,3-oxazol-2-yl)-3-phenylbutanoateYield 78%

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 8028TetrahydrofuranSolvent

Procedure

To a solution of ethyl (±)-4-(4-carboxy-1,3-oxazol-2-yl)-3-phenylbutanoate (500 mg, 1.65 mmole) in dry THF (8 mL) was added 4-methylmorpholine (0.22 mL, 1.99 mmole) then ethyl chloroformate (0.19 mL, 1.99 mmole) at 0° C. After 10 min, NaBH4 (249 mg, 6.59 mmole) was added all at once, then MeOH (8 mL) was added dropwise. After 30 min, the mixture was quenched with H2O (20 mL) and extracted with EtOAc (3×20 mL). The combined organic extracts were dried over MgSO4, filtered, and concentrated under reduced pressure. The residue was chromatographed on silica gel (80% EtOAc/hexanes) to give the title compound (371 mg, 78%) as a yellow oil: MS (ES) m/e 290 (M+H)+.

Workup

  1. customat 0° C
  2. additionwas added dropwise
  3. waitAfter 30 min
  4. customthe mixture was quenched with H2O (20 mL)
  5. extractionextracted with EtOAc (3×20 mL)
  6. dry with materialThe combined organic extracts were dried over MgSO4
  7. filtrationfiltered
  8. concentrationconcentrated under reduced pressure
  9. customThe residue was chromatographed on silica gel (80% EtOAc/hexanes)

Sources & evidence

ORD record
ord-a10f23b0051d445689eb613a346e7c68
Source dataset
uspto-grants-2002_10
Patent number
US06458814B1

Reaction notes

Loading…