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0 °C

To a solution of 2.42 g (9.2 mmol) of triphenylphosphine in 5 ml of dichloromethane is added dropwise, at 0° C. under a nitrogen atmosphere, 0.70 ml (8.8 mmol) of sulphuryl chloride. The reaction medium is left stirring for 10 minutes at 0° C., followed by addition over 5 minutes of a solution containing 1.06 g (4.4 mmol) of 2-amino-3-cyclopentylbenzenesulphonic acid and 1.04 ml of tributylamine in 3 ml of dichloromethane. The mixture is brought to room temperature and is left at this temperature for 2 hours, then it is purified by chromatography on a column of silica gel, eluting with a dichloromethane/pentane mixture (1:1).

1. waitThe reaction medium is left
2. additionfollowed by addition over 5 minutes of a solution
3. customis brought to room temperature
4. waitis left at this temperature for 2 hours
5. customit is purified by chromatography on a column of silica gel
6. washeluting with a dichloromethane/pentane mixture (1:1)