Ethanol → Ethyl 5-{4-[(4-hydroxymethyl-2-methoxyphenoxy)methyl]-5-methyl-1,3-oxazol-2-yl}thiophene-2-carboxylate

HRID 2221644Notes

Reaction equation

HRID 2221644 reaction equation
[CH:1]([C:3]1[CH:26]=[CH:25][C:6]([O:7][CH2:8][C:9]2[N:10]=[C:11]([C:15]3[S:19][C:18]([C:20]([O:22][CH2:23][CH3:24])=[O:21])=[CH:17][CH:16]=3)[O:12][C:13]=2[CH3:14])=[C:5]([O:27][CH3:28])[CH:4]=1)=[O:2].C(O)C.[BH4-].[Na+].O>O1CCCC1>[OH:2][CH2:1][C:3]1[CH:26]=[CH:25][C:6]([O:7][CH2:8][C:9]2[N:10]=[C:11]([C:15]3[S:19][C:18]([C:20]([O:22][CH2:23][CH3:24])=[O:21])=[CH:17][CH:16]=3)[O:12][C:13]=2[CH3:14])=[C:5]([O:27][CH3:28])[CH:4]=1

Participants

6

Reactant 4

HCID 702EthanolHCID 962WaterHCID 4311764Sodium borohydrideHCID 86605741Ethyl 5-{4-[(4-formyl-2-methoxyphenoxy)methyl]-5-methyl-1,3-oxazol-2-yl}thiophene-2-carboxylate

Product 1

HCID 69217614Ethyl 5-{4-[(4-hydroxymethyl-2-methoxyphenoxy)methyl]-5-methyl-1,3-oxazol-2-yl}thiophene-2-carboxylateYield 92.7%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of ethyl 5-{4-[(4-formyl-2-methoxyphenoxy)methyl]-5-methyl-1,3-oxazol-2-yl}thiophene-2-carboxylate (5.60 g) in tetrahydrofuran (100 mL)-ethanol (10 mL) was gradually added sodium borohydride (0.26 g) at 0° C. After stirring at room temperature for 1 hr, water was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate and concentrated to give ethyl 5-{4-[(4-hydroxymethyl-2-methoxyphenoxy)methyl]-5-methyl-1,3-oxazol-2-yl}thiophene-2-carboxylate as colorless crystals (5.22 g, yield 92%). Recrystallization from ethyl acetate-hexane gave colorless prism crystals. melting point: 108-109° C.

Workup

  1. customat 0° C
  2. extractionthe mixture was extracted with ethyl acetate
  3. washThe organic layer was washed with saturated brine
  4. dry with materialdried over anhydrous magnesium sulfate
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-bf4be7c7a9834fb8b484ab3b37e25fbd
Source dataset
uspto-grants-2008_05
Patent number
US07368578B2

Reaction notes

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