Dimethyl Sulfate → HCID 12557677, compound

Participants

Reaction Steps

A mixture of 2-hydroxy-3-[N-[(4-methylphenyl)sulfonyl]-amino]-2,4,6-cycloheptatrien-1-one (14.5 g), potassium carbonate (12.5 g), dimethyl sulfate (12.5 g) and 2-butanone (145 ml) is heated at reflux for one hour. The mixture is filtered and the precipitate is washed with water and suspended in ethyl acetate. Hydrochloric acid (10%) is added until the solution is acidic. The organic phase is collected and dried over sodium sulfate. Evaporation of the solvent and crystallization of the residue from ethyl acetate-hexane gives 2-methoxy-7-[N-[(4-methylphenyl)-sulfonyl]amino]-2,4,6-cycloheptatrien-1-one, mp 163°-164° C. The above filtrate is evaporated and the residue is subjected to chromatography on silica gel using ethyl acetate-hexane (3:1). Evaporation of the eluates are crystallization of the residue from ethyl acetate gives 2-methoxy-3-[N-[(4-methylphenyl)sulfonyl]-N-methylamino]-2,4,6-cycloheptatrien-1-one, mp 101°-102° C and 2-methoxy-7-[N-[(4-methylphenyl)-sulfonyl]-N-methylmino]-2,4,6-cycloheptatrien-1-one, mp 94.5° C.

Provenance & Evidence