Exploration of N-phosphonoalkyl-, N-phosphonoalkenyl-, and N-(phosphonoalkyl)phenyl-spaced .alpha.-amino acids as competitive N-methyl-D-aspartic acid antagonists
摘要:
A series of N-substituted alpha-amino acids containing terminal phosphonic acid groups has been synthesized as potential N-methyl-D-aspartate (NMDA) receptor antagonists. NMDA receptor affinity was determined by displacement of a known ligand ([H-3]CPP) from crude rat brain synaptic membranes; an antagonist action was demonstrated by the inhibition of glutamate-induced accumulation of [Ca-45(2+)] in cultured rat cortical neurons. Receptor affinity was significantly correlated with antagonist activity (Figure 1). Moderate affinity (IC50 = 1-2-mu-M) was retained for analogues (31 and 32, Table 1; and 59 and 66, Table II) with reduced flexibility in their phosphonate side chains and is consistent with entropy playing a role in determining receptor affinity. Modeling studies suggest a folded conformation that brings the distal phosphonic acid group into close proximity with the alpha-carboxylate is required for binding. Each of the active analogues possess entropy-limiting features (double bonds, phenyl rings) in their side chains that allows the superposition of their key NH2, alpha-COOH, and distal PO3H2 groups with those of known competitive antagonists. Affinity decreased for analogues with alpha-carbon substitution, presumably because the alpha-substituent inhibits the folding of these structures into a bioactive conformation and occupies receptor-excluded volume. A complete description of the NMDA antagonist pharmacophore model is provided in a companion paper. 1
N-substituted .alpha.-amino acids and derivatives thereof having
申请人:Warner-Lambert Company
公开号:US05179085A1
公开(公告)日:1993-01-12
N-substituted .alpha.-amino acids and derivatives thereof are described, as well as methods for the preparation and pharmaceutical composition of same, which are useful in selectively blocking the N-methyl-D-aspartate (NMDA) excitatory amino acid receptors in mammals and also are useful in treating cerebrovascular disorders such as cerebral ischemia or cerebral infarction resulting from thromboembolic or hemorrhagic stroke, cerebral vasospasm, hypoglycemia, cardiac arrest, status epilepticus and cerebral trauma as well as for treating schizophrenia, epilepsy, neurodegenerative disorders, Alzheimer's disease or Huntington's disease and also additionally useful as anesthetics in surgical procedures where a finite risk of cerebrovascular damage exists.
Copper-Catalyzed Oxidative [4 + 2]-Cyclization Reaction of Glycine Esters with Anthranils: Access to 3,4-Dihydroquinazolines
作者:Jie Ren、Chao Pi、Yangjie Wu、Xiuling Cui
DOI:10.1021/acs.orglett.9b01246
日期:2019.6.7
synthesis of 3,4-dihydroquinazolines has been developed via copper-catalyzed oxidative cross-dehydrogenative [4 + 2]-cyclization of glycine derivatives with anthranils. This strategy features high efficiency and wide substrate tolerance under simple reaction conditions. Various 3,4-dihydroquinazoline derivatives could be easily obtained starting from titled products through chemical transformations, which
Enantioselective synthesis of arylglycine derivatives by direct C–H oxidative cross-coupling
作者:Xiao-Hong Wei、Gang-Wei Wang、Shang-Dong Yang
DOI:10.1039/c4cc07361d
日期:——
A new method for the synthesis of chiral alpha-amino acid derivatives by enantioselective C-H arylation of N-aryl glycineesters with aryl boric acids in the presence of a chiral Pd(II)-catalyst has been developed. This work successfully integrates the direct C-H oxidation with asymmetric arylation and exhibits excellent enantioselectivity.
Visible‐Light‐Induced Oxidative α‐Alkylation of Glycine Derivatives with Ethers under Metal‐Free Conditions
作者:Yang Song、Hao Zhang、Jiabao Guo、Yifei Shao、Yuzhou Ding、Li Zhu、Xiaoquan Yao
DOI:10.1002/ejoc.202101242
日期:2021.11.25
A novel visible-light-induced couplingreaction of glycine derivatives with ethers is reported. Its scope was expanded to α-amino esters,α-amino ketones and α-amino amides. Not only various α-amino esters but also cyclic and acyclic ethers were well tolerated in this strategy. Metal-free catalysis and efficient synthesis under mild conditions are notable features of this method.