Acetyl chloride → 1-(5-Acetylthiophen-2-yl)propan-2-yl 4-methylbenzene-1-sulfonate

Participants

Reaction Steps

2-(p-Toluenesulphonyloxy)-propylthiophene was reacted with acetyl chloride and aluminium trichloride in methylene chloride to give 5-acetyl-2-(p-toluenesulphonyloxy)-propylthiophene. With sodium azide in DMSO there was obtained therefrom 5-(3-azidopropyl)-2-thienyl methyl ketone. Oxidation with sodium hydrobromite gave 5-(3-azidopropyl)-2-thiophenecarboxylic acid, m.p. 71°-72°. Reaction of this acid with thionyl chloride and subsequent treatment with conc. ammonia yielded 5-(3-azidopropyl)-2-thiophenecarboxamide, m.p. 85°-87°. There was obtained therefrom after treatment with triphenylphosphine and hydrolysis 5-(3-aminopropyl)-2-thiophenecarboxamide, m.p. 143.5°-144° (from water).

Provenance & Evidence