Hydrochloric Acid → Methyl 3-carbamoyl-5-iodobenzoate

Participants

Reaction Steps

20 ml of 1 M hydrochloric acid were added to a solution of 3.88 g (11.8 mmol) of sodium 3-iodo-5-(methoxycarbonyl)benzoate [J. H. Ackermann et al., J. Med. Chem. 1966, 9 (1), 165-168] in 100 ml of water. After 10 min, the mixture was extracted three times with in each case about 100 ml of ethyl acetate. The combined organic extracts were washed with saturated sodium chloride solution and dried over anhydrous magnesium sulphate. After filtration, the solvent was removed on a rotary evaporator. The residue that remained was dissolved in 75 ml of dichloromethane, and 5.2 ml (59.1 mmol) of oxalyl chloride and a small drop of DMF were added at RT. After 1 h of stirring at RT, all volatile components were removed on a rotary evaporator. The residue was then dissolved in 50 ml of dioxane and, at a temperature of about 0° C., slowly added dropwise to 44 ml of a 25% strength aqueous ammonia solution. After the dropwise addition had ended, the cooling bath was removed and stirring was continued at RT for 30 min. The precipitated product was then filtered off with suction, washed with cold water and dried under high vacuum. This gave 3.02 g (81% of theory, 97% pure) of the title compound.

Provenance & Evidence