An indole group in an amino acid or a peptide can be protected with a group shown by the formula: ##STR1## wherein R.sub.1 and R.sub.5 each is hydrogen, methyl or methoxy; R.sub.2 and R.sub.4 each is hydrogen or methyl; and R.sub.3 is methyl or methoxy, and said group may easily be removed without affecting the amino acid or the peptide to be derived from the protected amino acid or peptide. Thus, the present invention is useful in the synthesis of a peptide containing an indole group.
氨基酸或
多肽中的
吲哚基团可以用以下公式所示的保护基进行保护:##STR1## 其中R.sub.1和R.sub.5分别为氢、甲基或甲氧基;R.sub.2和R.sub.4分别为氢或甲基;R.sub.3为甲基或甲氧基,该基团可以轻松地去除而不影响从所保护的
氨基酸或
多肽中得到的
氨基酸或
多肽。因此,本发明在含有
吲哚基团的
多肽的合成中是有用的。