DCC and DMAP esterization reactions

I have to cry for help, and always generate an intermediate and not react down

I also reacted to this step of esterization, and I was preparing to use DCC/DMAP. Now it is a phenolic hydroxyl group that protects the alcohol, and it is difficult to protect the group.EssenceEssenceEssence

I can only look at it, I did not make similar reactions

You are the product reaction of dilate and diol hydroxyl groups, and you will definitely get a chaotic system.
It is recommended that you first use the gyro chlorine or acid anhydride to turn the di -sulfurite cycar carboxylic acid to the acid anhydride, and then react.
A lot of reactions with colusement and sulfur bonds are done.