Hydrochloric Acid → 3-Formyl-5-(pentafluoro-lambda6-sulphanyl)benzoic acid

Participants

Reaction Steps

With ice bath cooling, 11.5 ml (23 mmol) of a 2 M solution of 2-propylmagnesium chloride in diethyl ether were added dropwise to a solution of 3.0 g (9.17 mmol) of the compound of Example 15A in 1.6 ml of abs. THF. After the addition had ended, stirring was continued without cooling for another 30 min 1.76 ml (22.9 mmol) of DMF were added with ice bath cooling, and the mixture was stirred without cooling for a further 30 min. 20 ml of 1 M hydrochloric acid were then added, and the mixture was extracted with 100 ml of ethyl acetate. The organic phase was washed with 1 M hydrochloric acid and saturated sodium chloride solution, dried over sodium sulphate, filtered and concentrated to dryness on a rotary evaporator. The residue was suspended in 50 ml of dichloromethane/pentane (1:1) and the solid was filtered off and dried. Any contaminations present were removed by preparative HPLC (Method 22). This gave 780 mg (31% of theory) of the title compound.

Provenance & Evidence