[Cl:1][CH2:2][C:3]([N:5]1[C@@H:9]([CH3:10])[CH2:8][CH2:7][C@H:6]1[C:11]([NH2:13])=O)=[O:4].N1C=CN=C1.O=P(Cl)(Cl)Cl.[NH4+].[Cl-]>N1C=CC=CC=1>[Cl:1][CH2:2][C:3]([N:5]1[C@@H:9]([CH3:10])[CH2:8][CH2:7][C@H:6]1[C:11]#[N:13])=[O:4](2S,5S)-1-(2-Chloro-acetyl)-5-methyl-pyrrolidine-2-carboxylic acid amide (0.25 g, 1.2 mmol) and imidazole (85 mg, 1.25 mmol) ware mixed in pyridine (5 mL). The mixture was cooled to −35° C. and POCl3 (0.18 mL, 1.8 mmol) was added slowly. The mixture was stirred at −35° C. for 1 h. Saturated NH4Cl (20 mL) was added, and the mixture was extracted with EtOAc (3×). The combined organic layers were dried (Na2SO4), filtered and concentrated under reduced pressure. The oil was purified by flash chromatography (hexane:EtOAC, 2:1) to yield the title compound. MS (DCI) m/z 187 (M+H)+.
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