Trimethylsilylacetylene → 3-ethynyl-4-methyl-N-(3-((4-methylpiperazin-1-yl)methyl)-5-(trifluoromethyl)phenyl)benzamide

Participants

Reaction Steps

To a mixture of 3-iodo-4-methyl-N-(3-((4-methylpiperazin-1-yl)methyl)-5-(trifluoromethyl)phenyl)benzamide (951 mg, 1.84 mmol), PdCl2(PPh3)2 (65 mg, 0.092 mmol) in MeCN (75 mL) and Et3N (20 mL) at room temperature was added trimethylsilylacetylene (0.8 mL, 5.52 mmol) followed by CuI (18 mg, 0.092 mmol). The resulting mixture was allowed to stir at room temperature for 2 h at which time the reaction mixture was concentrated under reduced pressure followed by reconstitution in MeOH (100 mL). To this mixture was added enough K2CO3 to saturate the mixture and the mixture was allowed to stir for about 1.5 h. The mixture was filtered through a pad of Celite. To the filtrate was added silica gel (˜20 mL) and the mixture was concentrated under reduced pressure, and purified via automated flash chromatography (silica gel, 0% to 15% MeOH in CH2Cl2, gradient elution) to afford 3-ethynyl-4-methyl-N-(3-((4-methylpiperazin-1-yl)methyl)-5-(trifluoromethyl)phenyl)benzamide.

Provenance & Evidence