Oxalyl chloride → 3-(3-Fluoro-4-methoxy-phenysulfanyl)-3-methyl-butyroyl chloride

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Reaction Steps

To a solution of 3-(3-fluoro-4-methoxy-phenylsulfanyl)-3-methyl-butyric acid (Compound 201, 3.00 g, 11.6 mmol) in 40 mL of benzene at room temperature was added a solution of oxalyl chloride (2.21 g, 17.4 mmol) in 5 mL of benzene over 30 minutes. After 3 hours, the solution was washed with ice cold 5% aqueous NaOH (CAUTION: a large volume of gas is released during this procedure), followed by ice cold H2O, and finally saturated aqueous NaCl. The solution was dried (Na2SO4) and concentrated under reduced pressure to give 2.83 g of a clear yellow oil. This material was used without further purification in the next step. 1H NMR (300 MHz, CDCl3)δ: 7.27 (2H, m), 6.96 (1H, t, J=8.4 Hz), 3.93 (3H, s), 3.13 (2H, s), 1.42 (6H, s).

Provenance & Evidence