Dopamine receptor modulation by conformationally constrained analogs of Pro-Leu-Gly-NH2
作者:Kuo Long Yu、G. Rajakumar、Lalit K. Srivastava、Ram K. Mishra、Rodney L. Johnson
DOI:10.1021/jm00402a031
日期:1988.7
Leu-Gly-NH2 dipeptide segment of PLG was replaced with the gamma-lactam residues 3(S)- and 3(R)-amino-2-oxopyrrolidineacetamide and the delta-lactam residue 3(S)-amino-2-oxopiperidineacetamide. The corresponding gamma-lactam analogues of less than Glu-Leu-Gly-NH2 were also synthesized. In a second series of analogues, the glycinamide residue of PLG was replaced with the 2-ketopiperazine, 3(S)-amino-2-pyrrolidone
已合成了两个系列的Pro-Leu-Gly-NH2(PLG)构象受限的类似物。在一系列类似物中,PLG的Leu-Gly-NH2二肽片段被γ-内酰胺残基3(S)-和3(R)-氨基-2-氧吡咯烷乙酰胺和δ-内酰胺残基3(S)取代-氨基-2-氧代哌啶乙酰胺。还合成了小于Glu-Leu-Gly-NH 2的相应的γ-内酰胺类似物。在第二系列类似物中,PLG的甘氨酰胺残基被2-酮戊哌嗪,3(S)-氨基-2-吡咯烷酮和3(S)-氨基-2-哌啶酮残基取代。测试上述类似物增强多巴胺受体激动剂2-氨基-6,7-二羟基-1,2,3,4-四氢萘(ADTN)与纹状体多巴胺受体结合的能力。在这项研究中合成的受PLG构象约束的类似物中,只有γ-内酰胺类似物3(R)-(NL-脯氨酰胺基)-2-氧代-1-吡咯烷乙酰胺(3)被发现具有显着活性。在预温育条件下,该类似物的活性是PLG的10,000倍。它在10(-9)和10(-10)M浓度下显着增强了ADTN的结合。