Hydrochloric Acid → 3-(3,4-Dichlorophenyl)-4-(imidazol-1-yl)butan-1-ol

HRID 844557Notes

Reaction equation

[BH4-].[Na+].[Cl:3][C:4]1[CH:5]=[C:6]([CH:11]([CH2:15][N:16]2[CH:20]=[CH:19][N:18]=[CH:17]2)[CH2:12][CH:13]=[O:14])[CH:7]=[CH:8][C:9]=1[Cl:10].Cl.C(=O)([O-])[O-].[Na+].[Na+]>C(O)C.O>[Cl:3][C:4]1[CH:5]=[C:6]([CH:11]([CH2:15][N:16]2[CH:20]=[CH:19][N:18]=[CH:17]2)[CH2:12][CH2:13][OH:14])[CH:7]=[CH:8][C:9]=1[Cl:10]

Participants

Conditions

Temperature: 0 °C

Procedure

Sodium borohydride (0.52 g) was added in three portions, over 5 minutes, to an ice-cooled solution of 3-(3,4-dichlorophenyl)-4-(imidazol-1-yl)butan-1-al (3.3 g) (see Preparation 18) in ethanol (25 ml). The mixture was stirred for a further hour before removing the solvent under reduced pressure to give a residue. The residue was then suspended in water (50 ml), cooled to 0° C. and the mixture first acidified to pH1 with 2N aqueous hydrochloric acid solution and then basified to pH14 by addition of solid sodium carbonate before being extracted with ethyl acetate (3×200 ml). The organic phases were combined, dried over anhydrous sodium sulphate and the solvent removed under reduced pressure to yield 3-(3,4-dichlorophenyl)-4-(imidazol-1-yl)butan-1-ol (2.84 g) as a cream solid.

Workup

custombefore removing the solvent under reduced pressure
customto give a residue
extractionbefore being extracted with ethyl acetate (3×200 ml)
dry with materialdried over anhydrous sodium sulphate
customthe solvent removed under reduced pressure

Sources & evidence

ORD record: ord-c07ef107c544415682a02fa84242a7c6
Source dataset: uspto-grants-2002_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06380396B1

Reaction notes

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