I want to modify my peptide. I have HOOC-RGD-peptide-NH2 and I want to react it with R-SH by dehydration method to get R-S-OC-RGD-peptide-NH2. I have tried to do so using MsOH and TEA in solvents toluene and DMF respectively, but couldn't get my desire product. Please suggest me any suitable detailed method to produce my required product (with reliable references).

Thanks in Advance!

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