I like to do SPPS by Fmoc/tBu chemistry to make a peptide (Z-Leu-Lys-Glu-Ala-OH) with an N-terminal-CBZ/Z group at Leu. I like to use Z- Leu-OH for the last coupling, but after the synthesis, I want to keep the Cbz/Z protection group at the N-terminus.

How to preserve the benzyloxycarbonyl (Cbz/Z) group at the N-terminus of the peptide during the removal of side-chain protecting groups with anhydrous TFA?

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