p-Toluenesulfonic acid → HCID 178493404, compound

Participants

Reaction Conditions

Reaction Steps

IBX (0.437 g, 1.562 mmol) was dissolved in anhydrous DMSO (5 mL) and [4-(1H-tetrazol-5-ylmethyl)-phenyl]-methanol (0.270 g, 1.562 mmol) was added. The reaction mixture was stirred at room temperature under nitrogen for 4 hours. Water (20 mL) was added. The white precipitate was filtered off, washed with water, and dried under vacuum. The crude compound was mixed with methanol (20 mL) and stirred for 30 minutes, before being filtered. The filtrate was concentrated to give 4-(1H-tetrazol-5-ylmethyl)-benzaldehyde as a white solid. Yield: 0.267 g (99%). To a solution of 2-amino-4,6-dimethoxybenzamide (0.157 g, 0.8 mmol) in N,N-dimethyl acetamide (5 mL) were added 4-(1H-tetrazol-5-ylmethyl)-benzaldehyde (0.260 g, 1.4 mmol), sodium hydrogen sulfite (58.5%, 0.159 g, 0.88 mmol) and p-toluenesulfonic acid (19 mg, 0.08 mmol). The reaction mixture was stirred at 150° C. for 3 h, then cooled to room temperature. Water (40 mL) was then added. A yellow precipitate was formed and filtered off, washed with water, and small amount of methanol. It was triturated with 10% methanol in ether to give 0.107 g of solid, which was further purified by preparative HPLC, to give the title compound (0.082 g, 28%) as a white solid. MS (ES) m/z: 365.1 (M+1). MP 295-296° C.

Provenance & Evidence