1-(2-Hydroxyethyl)-5,6-dimethylbenzimidazole → 2-(5,6-Dimethylbenzimidazolyl)ethylphosphoric acid

Participants

Reaction Steps

A 0.19 g amount of the crude 1-(2-hydroxyethyl)-5,6-dimethylbenzimidazole and 2 ml of 2-cyanoethylphosphoric acid pyridinium salt solution (1 mmol/ml) were dissolved in 20 ml of dry pyridine, and the solution was concentrated to dryness under a reduced pressure. This process was repeated twice more, and further, the dried material was thoroughly dried by a vacuum pump, dissolved in 20 ml of dry pyridine, 1.67 g of dicyclohexylcarbodiimide was added thereto, and the mixture was stored at room temperature for 2 days. After an addition of water to the product, the mixture was concentrated to dryness under a reduced pressure, followed by an addition of 40 ml of an aqueous LiOH solution (0.5 N) to carry out the reaction at 100° C. for 45 minutes. The reaction mixture was filtered to give a filtrate, which was diluted with water, adjusted to a pH of 2.5 to 3, and then the mixture was applied to an ion exchange column (Dowex 50 (hydrogen ion form)). Elution was effected successively with water and 2 N pyridine, and the fractions eluted with the latter were concentrated to dryness under a reduced pressure to give 0.27 g of crude 2-(5,6-dimethylbenzimidazolyl)ethylphosphoric acid.

Provenance & Evidence