[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([CH:8](O)[CH3:9])=[CH:4][C:3]=1[S:11]([CH3:14])(=[O:13])=[O:12].C1(P([N:29]=[N+:30]=[N-:31])(C2C=CC=CC=2)=O)C=CC=CC=1.N12CCCN=C1CCCCC2>C1(C)C=CC=CC=1>[N:29]([CH:8]([C:5]1[CH:6]=[CH:7][C:2]([Cl:1])=[C:3]([S:11]([CH3:14])(=[O:13])=[O:12])[CH:4]=1)[CH3:9])=[N+:30]=[N-:31]A round bottom flask was charged with 1-(4-chloro-3-(methylsulfonyl)phenyl)ethanol (8.5 g, 32.44 mmol) and toluene (100 mL). Diphenyl phosphoryl azide (8.4 mL, 38.93 mmol) and 1,8-diazabicyclo[5.4.0]undec-7-ene (5.8 mL, 38.93 mmol) were added at 0° C. and the mixture was stirred over night at room temperature. The volatiles were removed under reduced pressure and the residue was diluted with water and extracted with EtOAc. The combined organic layers were concentrated under reduced pressure and the residue was purified by column chromatography to get the product (2.4 g, 28% yield).
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