Potassium Carbonate → Ethyl [(2-(2,2-diphenylethyl)thio-4,5-dihydronaphtho[1,2-d]thiazol-6-yl)oxy]acetate

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To a solution of ethyl[(2-mercapto-4,5-dihydronaphtho[1,2-d]thiazol-6-yl)oxy]acetate (1.80 g, 5.60 mmol) in N,N-dimethylformamide (15 mL) was added 2,2-diphenylethyl methanesulfonate (1.80 g, 6.20 mmol) followed by addition of potassium carbonate (857 mg, 6.20 mmol) and the mixture was stirred at 60° C. for 2 hours. This reaction mixture was diluted with water and extracted with ethyl acetate. The organic layer was washed with water and saturated aqueous sodium chloride solution, dried over MgSO4, and filtered. The filtrate was concentrated under reduced pressure to provide 2.70 g of ethyl[[2-(2,2-diphenylethyl)thio-4,5-dihydronaphtho[1,2-d]thiazol-6-yl]oxy]acetate. To a solution of this compound (0.70 g, 1.44 mmol) in a mixture of tetrahydrofuran (8 mL) and methanol (2 ml) was added 1N-aqueous sodium hydroxide solution (1.5 mL) dropwise and the mixture was stirred at room temperature for 5 minutes. The solvent was then distilled off under reduced pressure. To the residue was added 1N-hydrochloric acid, and the mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated aqueous sodium chloride solution, dried over MgSO4, and filtered. The filtrate was concentrated under reduced pressure and the residue was recrystallized from ethyl acetate-hexane to provide 0.43 g of the title compound. Yield 61%.

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