Dabco → O-(2,6-Dichloro-4-nitrophenyl) dimethylcarbamothioate

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A solution of 2,6-dichloro-4-nitro-phenol (3.0 g, 14.4 mmol) in N,N-dimethylformamide (70 mL) at 25° C. was treated with 1,4-diazabicyclo[2.2.2]octane (3.16 mL, 28.8 mmol) and dimethylthiocarbamoyl chloride (2.85 g, 23.04 mmol). The reaction was stirred at 25° C. for 18 h. At this time, the reaction was diluted with ethyl acetate (250 mL) and was then washed with a 1N aqueous hydrochloric acid solution (1×125 mL), water (1×125 mL), and a saturated aqueous sodium chloride solution (1×125 mL), dried with magnesium sulfate, filtered and concentrated under vacuum. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80:20 petroleum ether/ethyl acetate) afforded dimethyl-thiocarbamic acid O-(2,6-dichloro-4-nitro-phenyl) ester (79) (3.2 g, 75%) as a white solid; EI-LRMS for C9H8Cl2N2O3S (M−Cl)+ at m/z=259. Exact Mass=293.9633; Molecular weight=295.15

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