m-Chloroperbenzoic acid → HCID 53697930, compound

Participants

Reaction Steps

A solution of sodium periodate, 4.28 g (20 mol) in 40 ml of water is added dropwise to 6-fluoro-5-methoxy-2-methyl-1-(p-methylthiobenzylidene)-3-indenylacetic acid, 3.70 g (10 mmol) in 300 ml methanol and enough acetone to cause solution. This solution is stirred overnight at room temperature and filtered. The filtrate is evaporated at 30° to a small volume which causes the product to precipitate. The suspension is diluted with several volumes of water, and is cooled. Collected crystals are washed with water and methanol-water (1:1). The product is dried in vacuo over potassium hydroxide pellets and then in a vacuum oven at 70° C. The crude product is recrystallized from methylene chloride-petroleum ether to give 6-fluoro-5-methoxy-2-methyl-1-(p-methylsulfinyl-benzylidene)-3-indenylacetic acid (m.p. 190°-193°). 6-fluoro-5-methoxy-2-methyl-1-(p-methylsulfonylbenzylidene)-3-indenylacetic acid is prepared according to the procedure of Example 1, part G by the addition of 1.0 mol of m-chloroperbenzoic acid per mol of 6-fluoro-5-methoxy-2-methyl-1-(p-methylsulfinylbenzylidene)-3-indenyl acetic acid in an acetone solution.

Provenance & Evidence