Formic Acid → HCID 20213668, compound

Participants

Reaction Steps

A sodium methyl mercaptide solution was prepared by adding 5 ml of methylmercaptan to 1.75 g of Na in 60 ml of absolute ethanol. While stirring and cooling this solution to below 10° C. it was added to a solution of 17.6 g of 2-bromo-3-nitro-5-formylthiophene in 200 ml of ethanol. After stirring at room temperature for another 2 hours, 200 ml of water were added, after which the formed precipitate was sucked off, washed with water-ethanol mixture (1:1 v/v), and recrystallized from isopropanol. 6.5 g of 2-methylthio-3-nitro-5-formylthiophene of melting point 129°-131° C. were obtained. Then 2.35 g of NaHCO3, 3.1 g of 2-methylthio-3-nitro-5-formylthiophene, and 1.2 g of NH2OH.HCl were added successively to 50 ml of formic acid. The reaction mixture was refluxed for 1 hour, after which, water was added and the formed precipitate was sucked off. After recrystallization from isopropanol the desired 2-methylthio-3-nitro-5-cyanthiophene was obtained in a yield of 2.3 g; melting point 150° C.

Provenance & Evidence