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0 °C

To a solution of 4-methoxy-2-methylaniline (2.51 mL, 19.7 mmol) and saturated aqueous sodium hydrogen carbonate (13.5 ml) in tetrahydrofuran (13.5 mL) was added thiophosgene (1.50 mL, 19.7 mmol), and the mixture was stirred at 0° C. for 30 min. The reaction mixture was extracted with ethyl acetate. The combined organic layer was washed with brine, dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluting with a 0-10% ethyl acetate/n-hexane gradient mixture. The desired fractions were concentrated in vacuo to give the title compound as a colorless oil (2.80 g, 15.6 mmol, 79%).

1. extractionThe reaction mixture was extracted with ethyl acetate
2. washThe combined organic layer was washed with brine
3. dry with materialdried over anhydrous magnesium sulfate
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customThe residue was purified by flash column chromatography on silica gel eluting with a 0-10% ethyl acetate/n-hexane gradient mixture
7. concentrationThe desired fractions were concentrated in vacuo