Water → 4-bromo-3-chloro-N-trimethylsilanylmethyl-thiobenzimidic acid methyl ester

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To a solution of 4-bromo-3-chloro-N-trimethylsilanylmethyl-thiobenzamide (10.40 g, 30.88 mmol) in THF (200 mL) was added methyl iodide (5.77 mL, 13.15 g, 92.7 mmol) and Cs2CO3 (30.19 g, 92.7 mmol) at −5° C. After 1 h at this temperature, the mixture was heated at 40° C. and stirred over night. Water was added and the mixture was extracted three times with MTBE. The combined organic phases were dried over Na2SO4, filtered and concentrated in vacuum. The residue was purified by filtration over a short plug of silica gel to give the title compound (8.25 g), which was used in the next step without further purification.

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