Methods of making unnatural amino acids are provided which unnatural amino acids can be incorporated into peptides which either inhibit or promote the secretion of gonadotropins by the pituitary gland and inhibit the release of steroids by the gonads. These unnatural amino acids are useful in the synthesis of peptides and have the formula (a): ##STR1## where W is (CH.sub.2) or ##STR2## n is an integer from 1 to 6; j=1, 2 or 3, and preferably, Y is N--CN, X is NH and R.sub.2 is alkyl, modified alkyl, alkenyl, alkynyl, aryl or methyl pyridyl. Disclosed are peptides that are analogs of the decapeptide GnRH wherein there is at least one residue of an unnatural amino acid in the 3-, 5-, 6- and/or 8-positions.
提供了制备非天然
氨基酸的方法,这些非天然
氨基酸可以被合并到肽中,这些肽可以抑制或促进垂体腺分泌
促性腺激素并抑制性腺激素的释放。这些非天然
氨基酸在肽的合成中是有用的,其
化学式为(a):##STR1## 其中W为(CH.sub.2)或##STR2## n为1到6的整数,j=1,2或3,优选Y为N--CN,X为NH,R.sub.2为烷基,修饰烷基,烯基,炔基,芳基或
甲基吡啶基。揭示了类似于十肽GnRH的肽,其中在3、5、6和/或8位至少有一个非天然
氨基酸残基。