2, 4-disubstituted-pyridine N-oxides useful as HIV reverse...

Details 2, 4-disubstituted-pyridine N-oxides useful as HIV reverse... 2, 4-disubstituted-pyridine N-oxides useful as HIV reverse...

2003-06-25

2004-10-26

Davis, Zinna Northington (Department: 1625)

Drug, bio-affecting and body treating compositions

Designated organic active ingredient containing

Having -c-, wherein x is chalcogen, bonded directly to...

C514S272000, C514S335000, C514S336000, C514S352000, C546S297000, C546S264000, C546S269700, C546S286000, C546S288000, C546S289000, C546S307000, C544S333000, C544S334000, C544S335000

Reexamination Certificate

active

06809109

ABSTRACT:

FIELD OF THE INVENTION
This invention relates generally to pyridine N-oxide compounds and also pyridine N-oxide compounds which are useful as inhibitors of HIV reverse transcriptase, pharmaceutical compositions and diagnostic kits comprising the same, methods of using the same for treating viral infection or as assay standards or reagents, and intermediates and processes for making such pyridine N-oxide compounds.
BACKGROUND OF THE INVENTION
Two distinct retroviruses, human immunodeficiency virus (HIV) type-1 (HIV-1) or type-2 (HIV-2), have been etiologically linked to the immunosuppressive disease, acquired immunodeficiency syndrome (AIDS). HIV seropositive individuals are initially asymptomatic but typically develop AIDS related complex (ARC) followed by AIDS. Affected individuals exhibit severe immunosuppression which predisposes them to debilitating and ultimately fatal opportunistic infections.
The disease AIDS is the consequence of HIV-1 or HIV-2 virus following its complex viral life cycle. The virion life cycle involves the virion attaching itself to the host human T-4 lymphocyte immune cell through the binding of a glycoprotein on the surface of the virion's protective coat with the CD4 glycoprotein on the lymphocyte cell. Once attached, the virion sheds its glycoprotein coat, penetrates into the membrane of the host cell, and uncoats its RNA. The virion enzyme, reverse transcriptase, directs the process of transcribing the RNA into single-stranded DNA. The viral RNA is degraded and a second DNA strand is created. The now double-stranded DNA is integrated into the human cell's genes and those genes are used for virus reproduction.
RNA polymerase transcribes the integrated viral DNA into viral mRNA. The viral RNA is translated into the precursor gag-pol fusion polyprotein. The polyprotein is then cleaved by the HIV protease enzyme to yield the mature viral proteins. Thus, HIV protease is responsible for regulating a cascade of cleavage events that lead to the virus particle's maturing into a virus that is capable of full infectivity.
The typical human immune system response, killing the invading virion, is taxed because the virus infects and kills the immune system's T cells. In addition, viral reverse transcriptase, the enzyme used in making a new virion particle, is not very specific, and causes transcription mistakes that result in continually changed glycoproteins on the surface of the viral protective coat. This lack of specificity decreases the immune system's effectiveness because antibodies specifically produced against one glycoprotein may be useless against another, hence reducing the number of antibodies available to fight the virus. The virus continues to reproduce while the immune response system continues to weaken. In most cases, without therapeutic intervention, HIV causes the host's immune system to be debilitated, allowing opportunistic infections to set in. Without the administration of antiviral agents, immunomodulators, or both, death may result.
There are at least three critical points in the HIV life cycle which have been identified as possible targets for antiviral drugs: (1) the initial attachment of the virion to the T-4 lymphocyte or macrophage site, (2) the transcription of viral RNA to viral DNA (reverse transcriptase, RT), and (3) the processing of gag-pol protein by HIV protease.
Inhibition of the virus at the second critical point, the viral RNA to viral DNA transcription process, has provided a number of the current therapies used in treating AIDS. This transcription must occur for the virion to reproduce because the virion's genes are encoded in RNA and the host cell transcribes only DNA. By introducing drugs that block the reverse transcriptase from completing the formation of viral DNA, HIV-1 replication can be stopped.
A number of compounds that interfere with viral replication have been developed to treat AIDS. For example, nucleoside analogs, such as 3′-azido-3′-deoxythymidine (AZT), 2′,3′-dideoxycytidine (ddC), 2′,3′-dideoxythymidinene (d4T), 2′,3′-dideoxyinosine (ddI), and 2′,3′-dideoxy-3′-thia-cytidine (3TC) have been shown to be relatively effective in certain cases in halting HIV replication at the reverse transcriptase (RT) stage.
An active area of research is in the discovery of non-nucleoside HIV reverse transcriptase inhibitors (NNRTIs). As an example, it has been found that certain benzoxazinones and quinazolinones are active in the inhibition of HIV reverse transcriptase, the prevention or treatment of infection by HIV and the treatment of AIDS.
U.S. Pat. No. 5,874,430 describes benzoxazinone non-nucleoside reverse transcriptase inhibitors for the treatment of HIV. U.S. Pat. No. 5,519,021 describe non-nucleoside reverse transcriptase inhibitors which are benzoxazinones of the formula:
wherein X is a halogen, Z may be O.
EP 0,530,994 and WO 93/04047 describe HIV reverse transcriptase inhibitors which are quinazolinones of the formula (A):
wherein G is a variety of groups, R
3
and R
4
may be H, Z may be O, R
2
may be unsubstituted alkyl, unsubstituted alkenyl, unsubstituted alkynyl, unsubstituted cycloalkyl, unsubstituted heterocycle, and optionally substituted aryl, and R
1
may be a variety of groups including substituted alkyl.
WO 95/12583 also describes HIV reverse transcriptase inhibitors of formula A. In this publication, G is a variety of groups, R
3
and R
4
may be H, Z may be O, R
2
is substituted alkenyl or substituted alkynyl, and R
1
is cycloalkyl, alkynyl, alkenyl, or cyano. WO 95/13273 illustrates the asymmetric synthesis of one of the compounds of WO 95/12583, (S)-(−)-6-chloro-4-cyclopropyl-3,4-dihydro-4((2-pyridy)ethynyl)-2(1H)-quinazolinone.
Synthetic procedures for making quinazolinones like those described above are detailed in the following references: Houpis et al.,
Tetr. Lett
. 1994, 35(37), 6811-6814; Tucker et al.,
J. Med. Chem
. 1994, 37, 2437-2444; and, Huffman et al.,
J. Org. Chem
. 1995, 60, 1590-1594.
DE 4,320,347 illustrates quinazolinones of the formula:
wherein R is a phenyl, carbocyclic ring, or a heterocyclic ring. Compounds of this sort are not considered to be part of the present invention.
Even with the current success of reverse transcriptase inhibitors, it has been found that HIV patients can become resistant to a given inhibitor. Thus, there is an important need to develop additional inhibitors to further combat HIV infection.
SUMMARY OF THE INVENTION
Accordingly, the present invention provides novel reverse transcriptase inhibitors.
The present invention provides novel 2,4-disubstituted pyridine N-oxide compounds.
The present invention provides novel methods for treating HIV infection which comprises administering to a host in need of such treatment a therapeutically effective amount of the compound of the present invention, including a pharmaceutically acceptable salt form thereof.
The present invention provides novel methods for treating HIV infection which comprises administering to a host in need thereof a therapeutically effective combination of (a) at least one of the compounds of the present invention and (b) one or more compounds selected from the group consisting of HIV reverse transcriptase inhibitors and HIV protease inhibitors.
The present invention provides pharmaceutical compositions with reverse transcriptase inhibiting activity comprising a pharmaceutically acceptable carrier and a therapeutically effective amount of at least one of the compounds of the present invention or a pharmaceutically acceptable salt form thereof.
The present invention provides novel 2,4-disubstituted pyridine N-oxide compounds for use in therapy.
The present invention provides the use of novel 2,4-disubstituted pyridine N-oxide compounds for the manufacture of a medicament for the treatment of HIV infection.
These and other aspects, which will become apparent during the following detailed description, have been achieved by the inventors' discovery that compounds of fo

Affiliated with

Also associated with

Rating

2, 4-disubstituted-pyridine N-oxides useful as HIV reverse... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with 2, 4-disubstituted-pyridine N-oxides useful as HIV reverse..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 2, 4-disubstituted-pyridine N-oxides useful as HIV reverse... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3304016