Triethylamine → 7-acetyl-3-methyl-4-(2-methyl-3-(4-oxoquinazolin-3(4H)-yl)phenyl)-9H-pyrido[3,4-b]indole-1-carboxamide

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Reaction Steps

To a well degassed mixture of 7-bromo-3-methyl-4-(2-methyl-3-(4-oxoquinazolin-3(4H)-yl)phenyl)-9H-pyrido[3,4-b]indole-1-carboxamide (0.101 g, 0.188 mmol) and Bis(triphenylphosphine)palladium(II) chloride (0.018 g, 0.026 mmol) in 1,4-dioxane (2.0 mL) in a sealed tube was added tributyl(1-ethoxyvinyl)stannane (0.148 mL, 0.450 mmol) followed by triethylamine (0.052 mL, 0.375 mmol). The resulting mixture was evacuated and charged with nitrogen (2×), immersed in an oil bath at 100° C., and stirred overnight. The mixture was diluted with ethyl acetate, filtered through a pad of CELITE®, and concentrated under reduced pressure. The residue was dissolved in tetrahydrofuran (5 mL) and stirred with 1 N aqueous hydrochloric acid (2 mL) for 2 h. The solution was concentrated under reduced pressure, and the residue was suspended in water. The pH was adjusted to ˜6 with 1 N sodium bicarbonate, and the suspension was extracted with ethyl acetate (3×). The combined organic layers were washed with brine and dried over anhydrous sodium sulfate. Concentration under reduced pressure followed by purification by flash silica gel chromatography using a mixture of ethyl acetate and hexane (50%-62%-75%-88%) afforded 7-acetyl-3-methyl-4-(2-methyl-3-(4-oxoquinazolin-3(4H)-yl)phenyl)-9H-pyrido[3,4-b]indole-1-carboxamide (0.051 g, 0.102 mmol, 54% yield) as a pale yellow solid. LC/MS M+1=502.1.

Provenance & Evidence