The objective of the present invention is to provide a method for efficiently producing a long-chain peptide which method is suitable even for an industrial large scale production. The method for producing a long-chain peptide according to the present invention is characterized in comprising a step to deprotect an N-terminal site protected with BOC of a raw material peptide fragment with using a sulfonic acid compound, a step to selectively deprotect a C-terminal site protected with ONBn of a raw material peptide, and a step to condensate the obtained peptide fragment having the deprotected N-terminal site and the obtained peptide fragment having the deprotected C-terminal site in a liquid phase condition.
本发明的目的是提供一种高效生产长链肽的方法,该方法甚至适用于工业化大规模生产。根据本发明生产长链肽的方法,其特征在于包括一个步骤,用
磺酸化合物对原料肽片段中受 BOC 保护的 N 端位点进行脱保护、选择性地脱除原料肽中受 ONBn 保护的 C 端位点的步骤,以及在液相条件下冷凝所获得的具有脱除保护的 N 端位点的肽片段和具有脱除保护的 C 端位点的肽片段的步骤。