Hydrochloric Acid → HCID 68512089, compound

Participants

Reaction Conditions

Reaction Steps

To a mixture of 4-{4-[chloro(cyclohexyl)methyl]-5-ethylthiophen-2-yl}-3,6-dihydro-2H-thiopyran (1.37 g) synthesized above, methyl 4-aminobenzoate (1.15 g), sodium iodide (1.15 g) and N,N-dimethylacetamide (20 mL) was added sodium carbonate (810 mg), and the mixture was stirred overnight at 100° C. under an argon atmosphere. To the reaction mixture was added 1N hydrochloric acid to quench the reaction, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:hexane=3:17, volume ratio) to give a pale-brown solid. To a mixture of the obtained solid, tetrahydrofuran (10 mL) and ethanol (10 mL) was added 1N aqueous sodium hydroxide solution (10 mL), and the mixture was stirred overnight at 50° C. To the reaction mixture was added 1N hydrochloric acid (10 mL), and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:hexane=1:3, volume ratio) to give the title compound (554 mg, 31%) as a brown solid.

Provenance & Evidence