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0 °C

To a solution of 3-aminoisonicotinic acid 1-1 (3.89 g, 28.16 mmol) in DMF at 0° C. was added isovaleryl chloride (3.73 g, 30.97 mmol) and the reaction was stirred at 0° C. After 2.5 h, water was added to the reaction mixture and a precipitate formed which was collected by filtration and washed with ether to afford the title compound as a bone colored powder. 1H NMR (500 MHz, CDCl3) δ 0.95 (d, J=7 Hz, 6H), 2.06-2.13 (m, 1H), 2.27 (d, J=7 Hz, 2H), 7.73 (d, J=4.5 Hz, 1H), 8.41 (d, J=5 Hz, 1H), 9.37 (s, 1H). MS [M+H] C11H14N2O3=223.1.

1. customa precipitate formed which
2. filtrationwas collected by filtration
3. washwashed with ether