2-Thiopheneacetic acid → HCID 14041205, compound

Participants

Reaction Steps

Under a nitrogen atmosphere, 0.27 mL (280 mg, 3.7 mmol) of thiolacetic acid was added to 210 mg (0.93 mmol) of (2S,4S)-4-azido-1-t-butoxycarbonyl-2-methylpyrrolidine. The reaction mixture was stirred at room temperature for approximately four hours and concentrated with a rotary evaporator. The resulting oil was subjected to flash column chromatography using 1:1 ethyl acetate/hexane followed by ethyl acetate as eluant to obtain 190 mg of (2S,4S)-4-acetamido-1-t-butoxycarbonyl-2-methylpyrrolidine (84% yield) as a yellow oil which solidified on standing. Recrystallization of a small sample from hexanes provided a white solid, mp 108-110 degrees C. The material thus obtained was found to be identical to the material obtained by a two-step procedure that provides for the hydrogenation of (2S,4S)-4-azido-1-t-butoxycarbonyl-2-methylpyrrolidine with hydrogen and Pd/C followed by a separate acetylation step utilizing acetic anhydride.

Provenance & Evidence