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Segment condensations were performed to construct peptide fragments related to Sulfolobus solifataricus Ribonuclease. At each condensation step, the new protecting groups were stable. The protected peptide fragments were treated with a low-high HF procedure to give the desired peptide fragments. These peptide fragments were also prepared by the solid-phase method, and the obtained peptides were compared with those obtained by the solution method. The peptide fragments obtained by the solution method were identical with those obtained by the solid-phase method on analytical HPLC, indicating that the new protecting groups could be easily removed by HF, and no racemization occurred during the synthesis of the protected peptides.

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

Amino Acids and Peptides. LV. Application of 2-Adamantyl Derivatives as Protecting Groups to the Synthesis of Peptide Fragments Related to Sulfolobus sollfataricus Ribnuclease. II.