CC(C)([O-])C.[K+].[C:7]([CH2:9]P(=O)(OCC)OCC)#[N:8].[C:18]([CH2:20][C:21]1([C:26]#[N:27])[CH2:24][C:23](=O)[CH2:22]1)#[N:19]>O1CCCC1>[C:18]([CH2:20][C:21]1([C:26]#[N:27])[CH2:24][C:23](=[CH:9][C:7]#[N:8])[CH2:22]1)#[N:19]To a solution of 1.0 M of potassium tert-butoxide in tetrahydrofuran (2.15 mL) at 0° C. was added dropwise a solution of diethyl cyanomethylphosphonate (0.364 mL, 0.00225 mol) in tetrahydrofuran (4 mL, 0.04 mol). The reaction was warmed to rt and then cooled to 0° C. again. To the reaction mixture was added a solution of 1-(cyanomethyl)-3-oxocyclobutanecarbonitrile (0.274 g, 0.00204 mol) in tetrahydrofuran (2 mL, 0.02 mol). The reaction was allowed to warm up to rt and stirred at rt overnight. After quenching with water, the mixture was extracted with ether. The combined organic layers were washed with water and brine, then dried and evaporated to dryness. The crude mixture was used directly in next step.
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