You can try to convert the sulfonic acid into chloride ( R-SO2Cl) which is more reactive.

Hi Bumjun, I agree with Mikolaj, if you can make a sulfonyl chloride, it will be very reactive with primary amines.

Thanks for the response Mikotaj and Steingrimur.

Could you give me more details? Specific chemistry or literature that I could refer to?

Thanks

The conditions of reaction depend on the structure of your compound containing -SO3H group. I think that you should check methods using SOCl2 or PCl5. The disadvantage is that these reagents can also react with hydroxyl and carboxyl groups.

okay, I will check it out.

Thank you so much for your advice Mikotaj!