Cesium carbonate → 4-Bromo-2-chloro-1-[(3-methylbut-3-en-1-yl)sulfanyl]benzene

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To a mixture of 4-bromo-2-chlorobenzenethiol (1.68 g, 7.54 mmol) and Cs2CO3 (4.09 g, 12.6 mmol) in DMF (8.98 mL) at room temperature was added 3-methylbut-3-en-1-yl diphenyl phosphate (2.00 g, 6.28 mmol, synthesized according to a procedure in U.S. Pat. No. 5,006,550, 9 Apr. 1991) dropwise via a syringe. The reaction mixture was heated to 85° C. for 1 hour. It was then allowed to cool to room temperature and diluted with water (20.0 mL). The resulting mixture was extracted with EtOAc:hexanes mixture (1:1, 75.0 mL, 2×) and the combined organic layers were dried over Na2SO4, filtered and concentrated under vacuum. The crude mixture was purified by silica gel chromatography eluting with 0-10% EtOAc/hexanes to give the desired product as a colorless oil.

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