Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2002-10-21
2004-08-31
Bernhardt, Emily (Department: 1624)
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Heterocyclic carbon compounds containing a hetero ring...
C544S363000
Reexamination Certificate
active
06784181
ABSTRACT:
FIELD OF THE INVENTION
The present invention is directed to novel compounds, to a process for their preparation, their use and pharmaceutical compositions comprising the novel compounds. The novel compounds are useful in therapy, and in particular for the treatment of pain.
BACKGROUND AND PRIOR ART
The &dgr; receptor has been identified as having a role in many bodily functions such as circulatory and pain systems. Ligands for the &dgr; receptor may therefore find potential use as analgesics, and/or as antihypertensive agents. Ligands for the &dgr; receptor have also been shown to possess immunomodulatory activities.
The identification of at least three different populations of opioid receptors (&mgr;, &dgr; and &kgr;) is now well established and all three are apparent in both central and peripheral nervous systems of many species including man. Analgesia has been observed in various animal models when one or more of these receptors has been activated.
With few exceptions, currently available selective opioid &dgr; ligands are peptidic in nature and are unsuitable for administration by systemic routes. One example of a non-peptidic &dgr;-agonist is SNC80 (Bilsky E. J. et al.,
Journal of Pharmacology and Experimental Therapeutics,
273(1), pp. 359-366 (1995)). There is however still a need for selective &dgr;-agonists having not only improved selectivity, but also an improved side-effect profile.
Thus, the problem underlying the present invention was to find new analgesics having improved analgesic effects, but also with an improved side-effect profile over current &mgr; agonists, as well as having improved systemic efficacy.
Analgesics that have been identified and are existing in the prior art have many disadvantages in that they suffer from poor pharmacokinetics and are not analgesic when administered by systemic routes. Also, it has been documented that preferred &dgr; agonist compounds, described within the prior art, show significant convulsive effects when administered systemically.
We have now found that certain compounds not specifically disclosed by, but included within the scope of WO 98/28270, exhibit surprisingly improved &dgr;-agonist properties and in vivo potency relative to compounds disclosed in WO98/28270, when administered systemically. The compounds of the present invention exhibit significant and unexpected increased levels of delta receptor agonism and metabolic stability.
Outline of the Invention
The novel compounds according to the present invention are defined by the formula I
wherein
R
1
is selected from
(i) phenyl;
(ii) pyridinyl
(iii) thiophenyl
(iv) furanyl
(v) imidazolyl
(vi) triazolyl
where each R
1
phenyl ring and R
1
heteroaromatic ring may optionally and independently be further substituted by 1, 2 or 3 substituents selected from straight and branched C
1
-C
6
alkyl, NO
2
, CF
3
, C
1
-C
6
alkoxy, chloro, fluoro, bromo, and iodo. The substitutions on the phenyl ring and on the heteroaromatic ring may take place in any position on said ring systems.
Within the scope of the invention are also pharmaceutically acceptable salts of the compounds of the formula I, as well as isomers thereof.
In a preferred embodiment of the invention, the compounds of formula I are present as the (+)-enantiomer, or as the (−)-enantiomer.
By “isomers” we mean compounds of the formula I, which differ by the position of their functional group and/or orientation. By “orientation” we mean stereoisomers, diastereoisomers, regioisomers and enantiomers.
The novel compounds of the present invention are useful in therapy, especially for the treatment of various pain conditions such as chronic pain, neuropathic pain, acute pain, cancer pain, pain caused by rheumatoid arthritis, migraine, visceral pain etc. This list should however not be interpreted as exhaustive.
Compounds of the invention are useful as immunomodulators, especially for autoimmune diseases, such as arthritis, for skin grafts, organ transplants and similar surgical needs, for collagen diseases, various allergies, for use as anti-tumour agents and anti viral agents.
Compounds of the invention are useful in disease states where degeneration or dysfunction of opioid receptors is present or implicated in that paradigm. This may involve the use of isotopically labelled versions of the compounds of the invention in diagnostic techniques and imaging applications such as positron emission tomography (PET).
Compounds of the invention are useful for the treatment of diarrhoea, depression, anxiety, urinary incontinence, various mental illnesses, cough, lung oedema, various gastro-intestinal disorders, spinal injury and drug addiction, including the treatment of alcohol, nicotine, opioid and other drug abuse and for disorders of the sympathetic nervous system for example hypertension. Compounds of the invention are useful as an analgesic agent for use during general anaesthesia and monitored anaesthesia care. Combinations of agents with different properties are often used to achieve a balance of effects needed to maintain the anaesthetic state (eg. amnesia, analgesia, muscle relaxation and sedation). Included in this combination are inhaled anaesthetics, hypnotica, anxiolytics, neuromuscular blockers and opioids.
Also within the scope of the invention is the use of any of the compounds according to the formula I above, for the manufacture of a medicament for the treatment of any of the conditions discussed above.
A further aspect of the invention is a method for the treatment of a subject suffering from any of the conditions discussed above, whereby an effective amount of a compound according to the formula I above, is administered to a patient in need of such treatment. Also included within the scope of the present invention, is any novel intermediate as described in Scheme I hereinafter useful in the synthesis of compounds of formula I above.
Methods of Preparation
The compounds according to the present invention may be prepared by following any one of the procedures described in Schemes I, II, III, and IV. These known procedures are described in
J. March, Advanced Organic Chemistry,
4
th
Edition, John Wiley and sons (1992); Katritsky, A. R., Lan, X.
Chem. Soc. Rev
., pp. 363-373 (1994), which are hereby incorporated by reference.
P=a protecting group such as Bn, Boc, CBz
M=Li, Mg, Zn
X=Br, I
L=Cl, Br, OMs, OTs, I
R
1
=as defined in formula (I) above
P=a protecting group such as Bn, Boc, CBz
M=Li, Mg, Zn
X=Br, I
L=Cl, Br, OMs, OTs, I
R
1
=as defined in formula (I) above
P=a protecting group such as Bn, Boc, CBz
M=Li, Mg, Zn
X=Br, I
L=Cl, Br, OMs, OTs, I
R
1
=as defined in formula (I) above
P=a protecting group such as Bn, Boc, CBz
M=Li, Mg, Zn
X=Br, I
L=Cl, Br, OMs, OTs, I
R
1
=as defined in formula (I) above
REFERENCES:
patent: 3940386 (1976-02-01), Szabo et al.
patent: 5574159 (1996-11-01), Chang et al.
patent: 5681830 (1997-10-01), Chang et al.
patent: 5807858 (1998-09-01), Chang et al.
patent: 6130222 (2000-10-01), Roberts et al.
patent: 24 31 178 (1975-01-01), None
patent: 29 00 810 (1980-07-01), None
patent: 0 133 323 (1985-02-01), None
patent: 0 166 302 (1986-01-01), None
patent: 0 283 310 (1988-09-01), None
patent: 0 289 227 (1988-11-01), None
patent: 2 696 744 (1999-04-01), None
patent: 2 076 403 (1981-12-01), None
patent: 2 210 366 (1989-06-01), None
patent: 7-138230 (1995-05-01), None
patent: WO 86/04584 (1986-08-01), None
patent: WO 91/07967 (1991-06-01), None
patent: WO 93/15062 (1993-08-01), None
patent: WO 95/04051 (1995-02-01), None
patent: WO/97/23466 (1997-07-01), None
patent: WO 98/28270 (1998-07-01), None
patent: WO 98/28275 (1998-07-01), None
patent: WO 99/33806 (1999-07-01), None
Burkey et al., Medline Abstract for Life Sci., vol. 62,p1531-1536 (1998).*
Nagase et al. Medline Abstract for Life Sci., vol. 68,p. 2227-2231 (2001).*
Abstract for HU 217619. A corresponding English language PCT application is cited above as Reference AF
Brown William
Plobeck Niklas
Walpole Christopher
AstraZeneca AB
Bernhardt Emily
Fitch Even Tabin & Flannery
Sanzo Michael A.
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