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Quantities of 6.23 gm (0.033 mol) of 4-bromothiophenol and 8.28 gm (0.06 mol) of potassium carbonate are stirred into 100 ml of dimethylsulfoxide, dried over a molecular sieve in a nitrogen atmosphere at ambient temperature for 15 minutes, and then mixed with 8.51 gm (0.03 mol) of 6-(4-chlorobutoxy)-4,4-dimethyl-4H-3,1-benzoxazin-2-one. After stirring for one hour at ambient temperature, water is added in batches until a thick crystal slurry is produced. This is subjected to suction filtration, dried, and recrystallized from ethyl acetate/diisopropyl ether.

1. customdried over a molecular sieve in a nitrogen atmosphere at ambient temperature for 15 minutes
2. customis produced
3. filtrationThis is subjected to suction filtration
4. customdried
5. customrecrystallized from ethyl acetate/diisopropyl ether