Cleavage of aspartyl beta-phenacyl esters by selenophenol under neutral conditions.

Neutral selenophenol in DMF accomplished the removal of the beta-phenacyl protecting group of aspartic acid in solution, on the peptide Boc-Asp (beta-OPac)- Phe amide and on the resin peptide Boc-Trp(Nin-For)-Met-Asp (beta-OPac)-P (CCK 30-33) without alpha, beta-rearrangement.