[C:1](OC(=NC1CCCCC1)NC1CCCCC1)([CH3:4])([CH3:3])[CH3:2].[Cl:21][C:22]1[CH:27]=[C:26]([CH2:28][C:29]([OH:31])=[O:30])[CH:25]=[CH:24][N:23]=1>C(Cl)Cl>[Cl:21][C:22]1[CH:27]=[C:26]([CH2:28][C:29]([O:31][C:1]([CH3:4])([CH3:3])[CH3:2])=[O:30])[CH:25]=[CH:24][N:23]=1Compound 2-tert-butyl-1,3-dicyclohexylisourea (650 mg, 2.30 mmol) was added to a solution of 2-(2-chloropyridin-4-yl)acetic acid (200 mg, 1.16 mmol) in DCM (5 ml) at room temperature. The reaction mixture was stirred for 24 h, filtered, washed with DCM (5 ml) and saturated sodium bicarbonate solution (10 ml). The solvent was evaporated in vacuum to afford 200 mg (77%) of tert-butyl 2-(2-chloropyridin-4-yl)acetate as a colorless liquid.
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