Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Nitrogen containing other than solely as a nitrogen in an...
Reexamination Certificate
1995-06-06
2001-06-26
O'Sullivan, Peter (Department: 1621)
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Nitrogen containing other than solely as a nitrogen in an...
C514S183000, C514S353000, C514S457000, C514S472000, C546S306000, C549S288000, C549S480000, C552S008000, C564S230000, C564S237000, C564S238000, C564S239000, C564S240000
Reexamination Certificate
active
06251948
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to tri- and tetra-substituted guanidines, and to pharmaceutical compositions comprising the same, which possess neuroprotective capability. This invention further relates to methods involving the use of these compounds as excitatory amino acid antagonists, e.g., for treating diseases of the nervous system in which the pathophysiology of the disease involves excessive excitation of nerve cells by agonists of the glutamate/N-methyl-d-aspartate (NMDA) receptor. Such excessive excitation can lead to dysfunction of the nervous system in the case of epilepsy and to nerve cell degeneration in cases of hypoxia, hypoglycemia, brain or spinal chord ischemia, brain or spinal chord trauma and in neurodegenerative diseases such as Parkinson's disease, Huntington's disease, Amyotrophic Lateral Sclerosis (ALS), Alzheimer's disease, Down's Syndrome and Korsakoff's disease.
BACKGROUND OF THE INVENTION
A wide variety of substituted guanidines are disclosed in the patent literature. For example,
U.S. Pat. Nos. 1,411,731 and 1,422,506 disclose diphenylguanidine as a rubber accelerator;
U.S. Pat. No. 1,597,233 discloses N-o-tolyl-N′-phenyl-guanidine as a rubber accelerator;
U.S. Pat. No. 1,672,431 discloses N,N′-di-o-methoxyphenyl-guanidine as being useful for therapeutic purposes, especially in the form of water-soluble salts;
U.S. Pat. No. 1,730,338 discloses N-p-dimethyl-amino-phenyl-N′-phenyl-guanidine as a rubber accelerator;
U.S. Pat. No. 1,795,738 discloses a process for the production of N,N′-dialkyl-di-substituted guanidines, including N-di-ethyl-N′-phenyl-guanidine, N-diethyl-N′-isoamylguanidine, N-dimethyl-N′-isoamylguanidine and N-dimethyl-N′-ethylguanidine;
U.S. Pat. No. 1,850,682 discloses a process for the preparation of disubstituted guanidine rubber accelerators bearing an additional substituent on the imine nitrogen atom;
U.S. Pat. No. 2,145,214 discloses the use of disubstituted guanidines, e.g., diarylguanidines especially dixylylguanidine, as parasiticides;
U.S. Pat. No. 2,254,009 discloses sym-di-2-octyl-guanidine and U.S. Pat. Nos. 2,274,476 and 2,289,542 disclose sym-dicyclohexylguanidine as insecticides and moth larvae repellents;
U.S. Pat. No. 2,633,474 discloses 1,3-bis(o-ethylphenyl)guanidine and 1,3-bis(p-ethylphenyl)guanidine as rubber accelerators;
U.S. Pat. No. 3,117,994 discloses N,N′,N″-trisubstituted guanidines and their salts as bacteriostatic compounds;
U.S. Pat. No. 3,140,231 discloses N-methyl- and N-ethyl-N′-octylguanidines and their salts as antihypertensive agents;
U.S. Pat. No. 3,248,246 describes (Example 5) a 1,3-disubstituted guanidine whose substituents are hydrophobic hydrocarbon groups, one of which is naphthylmethyl and the other is n-butyl;
U.S. Pat. No. 3,252,816 discloses various N-substituted and unsubstituted cinnamyl-guanidines and generically the corresponding N′- and N″-alkyl substituted compounds and their salts as antihypertensive agents;
U.S. Pat. No. 3,270,054 discloses N-2-adamant-1-yl- and N-2-homoadamant-1-yl-oxy-ethyl-thioethyl- and aminoethyl-guanidine derivatives bearing at most two lower alkyl groups on the N′- and/or N″-nitrogen atom as sympathicolytic and anti-viral agents;
U.S. Pat. No. 3,301,755 discloses N-ethylenically unsubstituted-alkyl-guanidines and the corresponding N′- and/or N″-lower alkyl compounds as hypoglycemic and antihypertensive agents;
U.S. Pat. No. 3,409,669 discloses N-cyclohexylamino-(3,3-dialkyl-substituted-propyl)guanidines and the corresponding N′-alkyl- and/or N″-alkyl-substituted compounds as hypotensive agents;
U.S. Pat. No. 3,547,951 discloses 1,3-dioxolan-4-yl-alkyl-substituted guanidines which have anti-hypertensive activity and discloses lower alkyl, including n-butyl, as a possible substituent on the other amino group;
U.S. Pat. No. 3,639,477 discloses propoxylguanidine compounds as having anorectic properties;
U.S. Pat. Nos. 3,681,459; 3,769,427; 3,803,324; 3,908,013; 3,976,787; and 4,014,934 disclose aromatic substituted guanidine derivatives wherein the phenyl ring can contain hydroxy and/or halogen substituents for use in vasoconstrictive therapy;
U.S. Pat. No. 3,804,898 discloses N-benzylcyclobutenyl and N-benzylcyclobutenyl-alkyl-guanidines and the corresponding N-alkyl and/or N″-alkyl-substituted compounds as hypotensive agents;
U.S. Pat. No. 3,968,243 discloses N-aralkyl substituted guanidines and the corresponding N′-alkyl-N″-alkyl and N′,N′-aralkyl compounds as being useful in the treatment of cardiac arrhythmias;
U.S. Pat. No. 3,795,533 discloses o-halo-benzylidene-amino-guanidines and their use as anti-depressants for overcoming psychic depression;
U.S. Pat. No. 4,007,181 discloses various N,N′-disubstituted guanidines substituted on the imine nitrogen atom by an adamantyl as possessing antiarrhythmic and diuretic activities;
U.S. Pat. No. 4,051,256 discloses N-phenyl- and N-pyridyl-N′-cycloalkyl-guanidines as antiviral agents;
U.S. Pat. Nos. 4,052,455 and 4,130,663 disclose styrylamidines, as analgesics agents or for the prevention of blood platelets aggregation;
U.S. Pat. No. 4,109,014 discloses N-hydroxysubstituted guanidines and the corresponding N-methyl disubstituted guanidines as vasoconstrictor agents;
U.S. Pat. No. 4,169,154 discloses the use of guanidines in the treatment of depression;
U.S. Pat. No. 4,393,007 discloses N-substituted and unsubstituted, N-substituted methyl-N′-unsubstituted, monosubstituted and disubstituted-N″-unsubstituted and substituted guanidines as ganglionic blocking agents;
U.S. Pat. No. 4,471,137 discloses N,N,N′N″-tetraalkyl guanidines as being sterically hindered bases useful in chemical synthesis.
U.S. Pat. No. 4,709,094 discloses 1,3-disubstituted-guanidines, e.g., 1,3-dibutyl-guanidine and 1,3 di-o-tolyl-guanidine, as sigma brain receptor ligands.
For examples of other substituted guanidines, see, e.g., U.S. Pat. Nos. 1,422,506; 1,642,180; 1,756,315; 3,159,676; 3,228,975; 3,248,426; 3,283,003; 3,320,229; 3,479,437; 3,547,951; 3,639,477; 3,784,643; 3,949,089; 3,975,533; 4,060,640 and 4,161,541.
Geluk, H. W., et al.,
J. Med. Chem.,
12,712 (1969) describe the synthesis of a variety of adamantyl disubstituted guanidines as possible antiviral agents, including N,N′-di-(adamantan-1-yl)guanidine hydrochloride, N-(adamantan-1-yl-N′-cyclohexyl-guanidine hydrochloride and N-(adamantan-1-yl)-N′-benzyl-guanidine hydrochloride.
The amino acid L-glutamate is widely thought to act as a chemical transmitter substance at excitatory synapses within the central nervous system. Neuronal responses to glutamate are complex and appear to be mediated by at least three different receptor types, i.e., KA, QA and NMDA subtypes, each being named for their relatively specific ligands, i.e., kainic acid, quisaqualic acid and N-methyl-D-aspartic acid, respectively. An amino acid which activates one or more of these receptor types is referred to as an excitatory amino acid (EAA).
The NMDA subtype of excitatory amino acid receptors is activated during normal excitatory synaptic transmission in the brain. Activation of NMDA receptors under normal conditions is responsible for the phenomena of long-term potentiation, a memory-like phenomenon, at excitatory synapses. Excessive excitation of neurons occurs in epileptic seizures and it has been shown that over-activation of NMDA receptors contributes to the pathophysiology of epilepsy.
NMDA receptors are also strongly involved in nerve cell death which occurs following brain or spinal chord ischemia. Upon the occurrence of ischemic brain insults such as stroke or heart attack, an excessive release of endogenous glutamate occurs, resulting in the over-stimulation of NMOA receptors. Associated with the NMDA receptors is an ion channel. The recognition site, i.e., the NMDA receptor, is external to the ion channel. When glutamate interacts with the NMDA receptor, it ca
Keana John F. W.
Weber Eckard
Conlin David G.
Corless Peter F.
Dike Bronstein, Roberts & Cushman LLP
O'Sullivan Peter
State of Oregon acting by and through the Oregon State Board of
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