[CH2:1]([S:8][C:9]1[C:10]([CH2:17][OH:18])=[CH:11][S:12][C:13]=1[N+:14]([O-:16])=[O:15])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(N(C(C)C)CC)(C)C.[CH3:28][O:29][CH2:30]Cl>ClCCl>[CH2:1]([S:8][C:9]1[C:10]([CH2:17][O:18][CH2:28][O:29][CH3:30])=[CH:11][S:12][C:13]=1[N+:14]([O-:16])=[O:15])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1[4-(benzylthio)-5-nitrothien-3-yl]methanol (3.9g, 13.9 mmol) in dichloromethane (8 mL) was reacted with diisopropylethylamine (7.42 mL, 3 equivalents) and methoxymethyl chloride (2.38 mL, 2.25 equivalents) at 25° C. 16 hours. The reaction was concentrated under reduced pressure and the residue purified by flash chromatography on silica gel using a Biotage-40m column eluting with dichloromethane to give 3-(benzylthio)-4-[(methoxymethoxy)methyl]-2-nitrothiophene as a yellowish oil, (4.32 g, 94%). 1H NMR (300 MHz, CDCl3) δ ppm 3.36 (s, 3H), 4.20 (s, 2H), 4.34 (s, 2H), 4.62 (s, 2H), 7.13 (m, 3H), 7.21 (m,2H), 7.40 (s, 1H)
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