Studies directed toward the design of orally active renin inhibitors. 1. Some factors influencing the absorption of small peptides
摘要:
A systematic evaluation of structure-absorption relationships using a high throughput intraduodenal rat screening model has led to the delineation of a set of structural parameters that appear to govern bioavailability in a series of peptide-based renin inhibitors. Optimum structures, exemplified by 25 and 41, incorporated a single, solubilizing substituent at the C- or N-terminus combined with a lipophilic P2-site residue. Both inhibitors gave unprecedented plasma drug levels upon intraduodenal administration to monkeys, and the calculated bioavailability for 41 (14 +/- 4%) is the highest reported for any peptidic renin inhibitor.
conformation. In this work, we have expanded the study of the Miller tetrapeptide by examining a set of analogues and shorter sequences (dipeptideamides), characterized by chiral Cα-tetrasubstituted α-aminoacids of diverging bulkiness and optical configuration. Peptide synthesis in solution, conformational analysis by FT-IR absorption and 1H NMR techniques, and screening of catalytic activity as well have
在最近的一系列论文中,Miller和他的同事们能够证明基于His(π-Me)的末端保护肽是不对称酰基转移反应的有效催化剂,可用于醇的动力学拆分。在一种支持结构的溶剂中,活性最高的化合物之一,即一个含Aib的四肽,被折叠成一个分子内双氢键结合的β-发夹基序,并带有II'型β-转角构象。在这项工作中,我们已经通过检查一组类似物和较短序列(二肽酰胺)的扩大了米勒四肽的研究,其特征在于,通过手性Ç α -tetrasubstitutedα氨基发散膨松性和光学配置的酸。溶液中的肽合成,通过FT-IR吸收和1进行构象分析还进行了1 H NMR技术和催化活性的筛选。我们的结果证实了β-发夹3D结构与肽的催化活性之间的密切关系。已经发现选择性比米勒化合物略高的四肽类似物。但是,末端保护的,工业上更具吸引力的二肽酰胺效果差。
Substituted hydantoins
申请人:Goodnow, Alan Robert
公开号:US20060063814A1
公开(公告)日:2006-03-23
The present invention relates to compounds of the formula
which are useful in treating diseases characterized by the hyperactivity of MEK. Accordingly the compounds are useful in the treatment of diseases, such as, cancer, cognative and CNS disorders and inflammatory/autoimmune diseases.
Formamides derived from N-methyl amino acids serve as new chiral organocatalysts in the enantioselective reduction of aromatic ketimines with trichlorosilane
作者:Andrei V. Malkov、Sigitas Stončius、Kenneth N. MacDougall、Andrea Mariani、Grant D. McGeoch、Pavel Kočovský
DOI:10.1016/j.tet.2005.08.117
日期:2006.1
Asymmetric reduction of N-aryl ketimines 1a–k, 43, and 45 with trichlorosilane can be catalyzed by new N-methyl l-amino acid-derived Lewis-basic organocatalysts, such as the valine-derived bisamide 3d (10 mol%), in toluene at room temperature with high enantioselectivity (≤92% ee). The structure–reactivity investigation shows that the product configuration is controlled by the nature of the side chain
N-芳基酮亚胺1a - k,43和45用三氯硅烷的不对称还原可以由新的N-甲基l-氨基酸衍生的Lewis碱性有机催化剂催化,例如缬氨酸衍生的双酰胺3d(10 mol%),在室温下在甲苯中具有高对映选择性(≤92%ee)。结构反应研究表明,产物构型受催化剂支架侧链性质的控制(例如,在3d和6e中,i -Pr vs Me)),因此相同绝对构型的催化剂可能会诱导产物相反的对映异构体的形成。催化剂与传入的亚胺之间的芳烃-芳烃相互作用似乎是不对称诱导的前提。这种无金属的有机催化方案与传统的金属催化方法相比具有竞争优势。
Discovery of a low affinity thyrotropin-releasing hormone (TRH)-like peptide that exhibits potent inhibition of scopolamine-induced memory impairment in mice
作者:Chhuttan L. Meena、Shubdha Ingole、Satyendra Rajpoot、Avinash Thakur、Prajwal P. Nandekar、Abhay T. Sangamwar、Shyam S. Sharma、Rahul Jain
DOI:10.1039/c5ra06935a
日期:——
TRH-like peptides were synthesized in which the critical N-terminus residuel-pGlu was replaced with various heteroaromatic rings, and the central residue histidine with 1-alkyl-l-histidines.
The present invention is to provide a novel compound which is useful as a pharmaceutical agent such as an analgesic. The present invention is to provide the novel histidine derivative having an excellent analgesic action and the like. The compound of the present invention has a very high intermigration into the blood upon oral administration and is very useful as a pharmaceutical agent, especially an analgesic for the treatment of acute or chronic pain diseases and of neuropathic pain diseases.