Diisopropylethylamine → 2-methoxy-2-methyl-N-(5-phenylethynyl-pyridin-2-yl)-propionamide

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Reaction Steps

(100 mg, 0.515 mmol) 5-Phenylethynyl-pyridin-2-ylamine (Example 1, step 1) was dissolved in dichloromethane (5 ml) and 2-methoxy-2-methylpropionic acid (91 mg, 0.77 mmol, 1.5 equiv.), 2-bromo-1-ethyl pyridinium tetrafluoroborate (CAS 878-23-9) (211 mg, 0.77 mmol, 1.5 equiv.) and Hunig's Base (0.26 ml, 1.54 mmol, 3 equiv.) were added. The mixture was stirred for 14 hours at room temperature. The reaction mixture was extracted with saturated Na2CO3 solution and dichloromethane. The organic layer was dried over sodium sulfate and evaporated to dryness. The crude product was purified by prep HPLC to afford the desired 2-methoxy-2-methyl-N-(5-phenylethynyl-pyridin-2-yl)-propionamide (70 mg, 46% yield) was obtained as a yellow oil, MS: m/e=295.2 (M+H+).

Provenance & Evidence