Cl[CH2:2][C:3]1[CH:8]=[CH:7][CH:6]=[C:5]([O:9][CH2:10][C:11]([F:14])([F:13])[F:12])[N:4]=1.[N-:15]=[N+:16]=[N-:17].[Na+].O>CN(C)C(=O)C>[N:15]([CH2:2][C:3]1[CH:8]=[CH:7][CH:6]=[C:5]([O:9][CH2:10][C:11]([F:14])([F:13])[F:12])[N:4]=1)=[N+:16]=[N-:17]A mixture of 2-(chloromethyl)-6-(2,2,2-trifluoroethoxy)pyridine (0.35 g, 1.55 mmol, Step-4) and sodium azide (0.20 g, 3.10 mmol) in N,N-dimethylacetamide (8 mL) is stirred 90° C. for 1 hour. The reaction mixture is poured into water (50 mL), and extracted with n-hexane/ethyl acetate (1:10, 50 mL). The organic layer is washed with water (50 mL) and dried over sodium sulfate. The organic fraction is concentrated in vacuo to give 0.44 g (>99% yield) of the title compound as colorless oil. This material is used for the next reaction (Step-6) without further purification.
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