Triethylamine → HCID 67280520, compound

Participants

Reaction Steps

A mixture composed of di-tert-butyl {8-[(2,4-dimethoxybenzyl)amino]-2-[(4-methoxy-3,5-dimethylpyridin-2-yl)methyl]-2,7,8,9-tetrahydro-6-thia-1,2,3,5-tetraazabenzo[cd]azulen-4-yl}imidodicarbonate of Example 42 (47 mg), triethylamine (36 μl), dichloromethane (1 ml) and 4-chlorobutyryl chloride (14 μl) was stirred at room temperature for 12 hours. A 0.1 N sodium hydroxide solution was added to the reaction mixture, followed by extraction with ethyl acetate. The organic layer was dried over sodium sulfate and filtered. Then, the filtrate was concentrated under reduced pressure. The resulting residue was dissolved in dehydrated dichloromethane (1.5 ml). 1,3-Dimethoxybenzene (16 μl) and trifluoroacetic acid (1.5 ml) was added and the mixture was stirred at room temperature overnight. The reaction mixture was concentrated under reduced pressure, and a 0.1 N sodium hydroxide solution was added to the resulting residue, followed by extraction with ethyl acetate. The organic layer was dried over sodium sulfate and filtered. Then, the filtrate was concentrated under reduced pressure. Dimethylformamide (1 ml) and potassium tert-butoxide (15 mg) were added to the resulting residue, and the mixture was stirred at room temperature for two hours. The reaction mixture was separated with water and chloroform. Then, the organic layer was dried over sodium sulfate and filtered, and then the filtrate was concentrated under reduced pressure. The resulting residue was purified by silica gel thin-layer chromatography (chloroform-methanol) to obtain the title compound (13 mg, 46%) as a solid.

Provenance & Evidence