[N+:1]([C:4]1[CH:5]=[N:6][NH:7][CH:8]=1)([O-:3])=[O:2].Br[CH2:10][CH2:11][O:12][C:13]1[CH:18]=[CH:17][CH:16]=[C:15]([O:19][CH3:20])[CH:14]=1.C([O-])([O-])=O.[Cs+].[Cs+]>CC#N.C(Cl)Cl>[CH3:20][O:19][C:15]1[CH:14]=[C:13]([CH:18]=[CH:17][CH:16]=1)[O:12][CH2:11][CH2:10][N:6]1[CH:5]=[C:4]([N+:1]([O-:3])=[O:2])[CH:8]=[N:7]1To a solution of 4-nitro-1H-pyrazole (220 mg, 1.90 mmol) in MeCN (9.5 mL), 1-(2-bromoethoxy)-3-methoxybenzene (495 mg, 2.14 mmol) dissolved in MeCN (1.5 mL) and Cs2CO3 (697 mg, 2.14 mmol) was added. The resulting mixture was refluxed (80° C.) for 1.5 h, then the reaction mixture was allowed to reach rt. The mixture was diluted with DCM, filtered, the filter cake was washed with DCM and the filtrate was concentrated in vacuo to obtain 1-(2-(3-methoxyphenoxy)ethyl)-4-nitro-1H-pyrazole which was used in the next step without further purification. LC-MS conditions A: tR=0.85 min, [M+H]+=no ionization.
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