A guanidino group in an amino acid or a peptide can be protected with a specific group, i.e. pentamethylbenzensulfonyl, 2,4,6-trimethoxybenzenesulfonyl, 4-methoxy-2,3,5,6-tetramethylbenzenesulfonyl, 4-methoxy-2,6-dimethylbenzenesulfonyl or 4-methoxy-2,3,6-trimethylbenzenesulfonyl, 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 peptides containing the guanidino group.
氨基酸或肽中的
胍基团可以用特定的基团进行保护,即
五甲基苯磺酰基,2,4,6-三
甲氧基苯磺酰基,4-甲氧基-2,3,5,6-四甲基苯磺酰基,4-甲氧基-2,6-二甲基苯磺酰基或4-甲氧基-2,3,6-三甲基苯磺酰基,并且该基团可以在不影响从受保护的
氨基酸或肽衍生的
氨基酸或肽的情况下轻松去除。因此,本发明在合成含有
胍基团的肽方面是有用的。