[C:1](#[N:5])[CH2:2][C:3]#[N:4].CC(C)([O-])C.[K+].Br[C:13]([CH3:19])([CH3:18])[C:14]([O:16][CH3:17])=[O:15]>C1COCC1>[C:3]([CH:2]([C:1]#[N:5])[C:13]([CH3:19])([CH3:18])[C:14]([O:16][CH3:17])=[O:15])#[N:4]A 12 liter 3 neck round bottom flask equipped with a mechanical stirrer, thermometer, condenser and nitrogen bubbler, was charged with malononitrile (251 g, 3.802 moles) and THF (2 liters). Potassium t-butoxide (1M THF, 3.802 L, 3.802 moles) was then added. The mixture was stirred at 50° C. for 30 min. Methyl 2-bromoisobutyrate (688 g, 3.80 moles) was added and the reaction mixture was stirred overnight at 50° C. The reaction was partitioned between aqueous 1N HCl and EtOAc. The organic phase was washed with brine, dried over MgSO4, filtered and concentrated to give the indicated product. 1H NMR (400 MHz, CD3CN): δ 4.35 (s, 1H); 3.73 (s, 3H); 1.43 (s, 6H).
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