Formic Acid → 2-[6-(4-Methyl-piperazin-1-ylmethyl)-benzoimidazol-1-yl]-4-(3-trifluoromethyl-phenyl)thiazole-5-carboxylic acid amide trifluoroacetic acid salt

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Reaction Steps

A mixture of 0.1244 g (0.239 mmole) of 2-[5-(4-methyl-piperazin-1-ylmethyl)-2-nitro-phenylamino]-4-(3-trifluoromethylphenyl)-thiazole-5-carboxylic acid amide (VI.48c), 0.1186 g of 10% palladium on carbon catalyst and 10.4 mL of 96% formic acid was stirred under one atmosphere of hydrogen for 16 hours. The mixture was filtered through diatomaceous earth and the filter pad was washed with tetrahydrofuran. The filtrate was concentrated under reduced pressure. The residue was purified by reverse phase silica gel chromatography, eluting with acetonitrile-water-trifluoroacetic acid (gradient 10:90:0.1-60:40:0.1) to give 0.0693 g of 2-[6-(4-methyl-piperazin-1-ylmethyl)-benzoimidazol-1-yl]-4-(3-trifluoromethyl-phenyl)thiazole-5-carboxylic acid amide trifluoroacetic acid salt (I.48a). This salt was partitioned between 10 mL of saturated sodium carbonate solution and 150 mL of ethyl acetate. The organic layer was washed with 15 mL of water, then 15 mL of brine, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to give 0.0693 g of 2-[6-(4-methyl-piperazin-1-ylmethyl)-benzoimidazol-1-yl]-4-(3-trifluoromethyl-phenyl)thiazole-5-carboxylic acid amide (I.48) as a white solid. MH+/Z=501.

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