1.  Fmoc- is not a first-choice protecting group for solution phase peptide synthesins, in comparison to Boc- or Cbz-

2.  I think the best way after removal of the Fmoc- is to separate your dipeptide (a zwitterion) to aqueous phase and wash away the Fmoc-piperidine adduct and piperidine.

3.  Then saturate your aqueous layer with NaCl and push your didpeptide to organic layer before further purification，

用20%哌啶/DMF溶液脱保护，脱除后蒸去DMF洗涤就好

去保护基的混合物用乙腈/5%氨水就可以将产物和Fmoc分开
你的极性大约40/1吧

20％ piperidine/DMF, 然后用乙醚沉淀。