[N+:1]([C:4]1[CH:11]=[CH:10][CH:9]=[CH:8][C:5]=1[CH2:6]Br)([O-:3])=[O:2].CN(C=O)C.[CH2:17]([S-:19])[CH3:18].[Na+]>O>[CH2:17]([S:19][CH2:6][C:5]1[CH:8]=[CH:9][CH:10]=[CH:11][C:4]=1[N+:1]([O-:3])=[O:2])[CH3:18]10.0 g (46.3 mmol) of 2-nitrobenzyl bromide were introduced into 100 ml of DMF at 0° C., 3.89 g (46.3 mmol) of sodium ethanethiolate were added in portions, and the mixture was stirred at RT for 4 h. It was diluted with water and extracted with ethyl acetate, and the organic phase was dried over magnesium sulfate, filtered and concentrated. The residue was purified by flash chromatography (mobile phase: cyclohexane/ethyl acetate 9/1) to result in 7.40 g (81% of theory) of the title compound.
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