2-(Bromomethyl)-6-methylpyridine → 3-(4-Methoxy-3-methyl-benzoyl)-1-(6-methyl-pyridin-2-ylmethyl)-1H-[1,5]naphthyridin-4-one

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Reaction Steps

Experimental conditions analogous to those described for Step 3 of Example 1 using 75 mg (0.255 mmol) of 3-(4-Methoxy-3-methyl-benzoyl)-1H-[1,5]naphthyridin-4-one, 56.9 mg (0.306 mmol) of 2-bromomethyl-6-methyl-pyridine, 0.61 mL (0.306 mmol, 0.5 M in toluene) of potassium hexamethyldisilazane, and 2.5 mL of THF. The crude product was purified by flash column chromatography using a gradient of 20-100% ethyl acetate in hexane and further purified on the reverse phase HPLC with a C18 column, gradient of 20-70% acetonitrile—0.1% TFA to yield 38.6 mg of 3-(4-Methoxy-3-methyl-benzoyl)-1-(6-methyl-pyridin-2-ylmethyl)-1H-[1,5]naphthyridin-4-one. LC-MSD, m/z for C24H21N3O3 [M+H]: 400.16 LC retention time on HPLC, C18 column gradient 20-95% acetonitrile with 0.1% TFA in 4 minutes: 1.8 min.

Provenance & Evidence