Sulfuric Acid → 2-(1-Benzyl-5-methyl-4-imidazolyl)-1,3-dithian-5-one

Participants

Reaction Conditions

Reaction Steps

A mixture of 2-(1-benzyl-5-methyl-4-imidazolyl)-4-carbethoxy-1,3-dithian-5-one (15.5 g., 0.041 mole) in water (40 ml.) containing concentrated sulfuric acid (3.0 ml.) is heated at 100° C. for 4-5 hours. The mixture is cooled, diluted with 10% hydrochloric acid, washed with diethyl ether and filtered through a charcoal pad. The filtrate is made basic with sodium carbonate solution and extracted into methylene chloride. The solvent is dried and evaporated to give a dark brown oil (11.2 g.), 2-(1-benzyl-5-methyl-4-imidazolyl)-1,3-dithian-5-one, which is used as is in subsequent steps.

Provenance & Evidence