Sodium borohydride → 4-Methyl-3-methylbenzofuran-2-carboxylic acid ethyl ester

反応式

[CH2:1]([O:3][C:4]([C:6]1[O:7][C:8]2[CH:15]=[CH:14][CH:13]=[C:12]([CH2:16]Br)[C:9]=2[C:10]=1[CH3:11])=[O:5])[CH3:2].[BH4-].[Na+]>CS(C)=O.O>[CH2:1]([O:3][C:4]([C:6]1[O:7][C:8]2[CH:15]=[CH:14][CH:13]=[C:12]([CH3:16])[C:9]=2[C:10]=1[CH3:11])=[O:5])[CH3:2]

参加物

実験手順

To a solution of 0.291 g (0.98 mmol) of 4-bromomethyl-3-methylbenzofuran-2-carboxylic acid ethyl ester in 5 mL of DMSO was added 0.074 g (1.96 mmol) of sodium borohydride and the reaction was stirred at room temperature for 2 h. The reaction was diluted with water and extracted with ether. The organics were washed with water and brine, filtered and concentrated in vacuo. The residue was chromatographed on silica gel eluting with ethyl acetate/hexanes (1:10) to provide 0.209 g of 4-methyl-3-methylbenzofuran-2-carboxylic acid ethyl ester.