Sodium borohydride → 2-(4-Fluoro-3-methyl-phenyl)-4,6-dimethylbenzyl alcohol
Reaktionsgleichung
[F:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:15]=[C:14]([CH3:16])[CH:13]=[C:12]([CH3:17])[C:9]=2[CH:10]=[O:11])=[CH:4][C:3]=1[CH3:18].[BH4-].[Na+]>C(O)C>[F:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:15]=[C:14]([CH3:16])[CH:13]=[C:12]([CH3:17])[C:9]=2[CH2:10][OH:11])=[CH:4][C:3]=1[CH3:18]Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
2.90 grams (12 mmol) of 2-(4-fluoro-3-methyl-phenyl)-4,6-dimethylbenzaldehyde (prepared according to Stokker, Jour. Med. Chem. Vol. 29 p.170, 1986) was reduced with 0.454 grams (12 mmol) of sodium borohydride in ethanol (20 mL) at 0° C. The reaction was stirred 1 hr, quenched with aqueous ammonium chloride and the mixture extracted with ether. The organic portion was dried (MgSO4) and concentrated to give 2.90 grams of 2-(4-fluoro-3-methyl-phenyl)-4,6-dimethylbenzyl alcohol as an oil which solidified on standing. The crude solid was treated with 1.31 mL of thionyl chloride and heated on a steam bath for 1 hour. After cooling to room temperature, the crude mixture was taken up in water and extracted with ether. The ether was washed with water and dried(MgSO4), and concentrated to give an oily residue which was purified by silica gel chromatography (25% methylene chloride/75% hexane) to give 2-(4-fluoro-3-methyl-phenyl)-4,6-dimethylbenzyl chloride as a solid.