A peptide having the formula X--A--B--Y-- wherein A and B are the same or different and each represents an amino acid residue or a peptide residue, X represents an amino protective group, Y represents a carboxyl protective group selected from the group consisting of tertiary alkoxy, and benzyloxy, benzylamino and benzhydrylamino which can be substituted with an inert substituent, is prepared by a process which comprises reacting an amino acid or peptide having an N-terminal protective group, or a salt thereof of the formula: X--A--OH with an amino acid or peptide having a C-terminal protective group or a salt thereof of the formula: H--B--Y in the presence of a thiol proteinase or serine proteinase enzyme in an aqueous solution having a pH sufficient to maintain the enzyme activity of said thiol proteinase or serine proteinase.
一种
多肽具有公式X--A--B--Y--,其中A和B相同或不同,每个代表
氨基酸残基或
多肽残基,X代表
氨基保护基,Y代表从三级烷氧基、苄氧基、
苄胺基和苄基氢
氨基中选择的羧基保护基,可以用惰性取代基取代,通过一种方法制备,该方法包括在
水溶液中,在足以维持所述巯基
蛋白酶或
丝氨酸蛋白酶的酶活性的pH下,反应具有N-末端保护基的
氨基酸或
多肽或其盐的公式:X--A--OH与具有C-末端保护基的
氨基酸或
多肽或其盐的公式:H--B--Y在巯基
蛋白酶或
丝氨酸蛋白酶酶的存在下。