How do you selectively protect cyclic phosphoric acid in presence of carboxylic acid?

24 October 2018 0 3K Report

I have cyclic phosphoric acid in the six remembered ring as a part of a more complex compound in the presence of the carboxylic acid functional group in the structure of the same compound which I want to convert it to diazo ketone how can I protect the phosphoric acid without touching the carboxylic acid?

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