Formaldehyde → HCID 178491173, compound

Participants

Reaction Steps

A solution of 1.61 g of 4-(3-nitrobenzylamino)-1H-pyrazole-3-carboxylic acid 2,4-dimethoxybenzylamide, 1.25 g of paraformaldehyde and 0.94 g of anhydrous magnesium sulfate in 70 ml of glacial acetic acid is stirred at room temperature for 4 hours. 1.23 g of sodium cyanoborohydride are then added portionwise to this solution. The reaction medium is stirred for 2 hours at room temperature, and then poured onto 300 ml of aqueous 5N sodium hydroxide solution and 120 g of crushed ice, the pH being adjusted to 11. 300 ml of saturated sodium chloride solution are then added. This solution is filtered and the solid is washed three times with 60 ml of distilled water. The solid thus collected is air-dried. 1.51 g of 4-[methyl(3-nitrobenzyl)amino]-1H-pyrazole-3-carboxylic acid 2,4-dimethoxybenzylamide are obtained in the form of a pale yellow solid. ([M+H]+): 426). RT: 3.87 min (Method A).

Provenance & Evidence