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A solution of 1 g of the compound 5 dissolved in 90 mL of ethanol is introduced into a flask, and then a solution of sodium sulfite (1.1 equivalents, 617 mg) in 22 mL of water is added. The mixture is refluxed. After 20 hours of heating, the mixture is cooled to 0° C. The solution is filtered on a Büchner funnel, the obtained beige residue is washed with ethanol, as for the filtrate, it is evaporated under reduced pressure in order to obtain a yellow solid. This solid is washed with ethanol and diethyl ether. Both obtained solids are collected in order to obtain 1 g (80%) of the crude compound 6.

1. additionis introduced into a flask
2. temperatureThe mixture is refluxed
3. temperatureAfter 20 hours of heating
4. filtrationThe solution is filtered on a Büchner funnel
5. washthe obtained beige residue is washed with ethanol, as for the filtrate, it
6. customis evaporated under reduced pressure in order
7. customto obtain a yellow solid
8. washThis solid is washed with ethanol and diethyl ether
9. customBoth obtained solids are collected in order