Patent Application
20120189579
The present invention concerns hepatitis C inhibitors.
Viral proteins constitute a group of biologically active proteins with high pharmacological value. Drugs to deal with viral infections are a field of medicine that has been traditionally weak. However since the 1980s, the full genetic sequences of viruses began to be available to researchers, and they began to learn how viruses worked in detail, and to envision what kind of molecules were needed to jam their machinery. The general idea behind modern antiviral drug design is to identify viral proteins, or parts of proteins, that can be disabled. The targets should also be common across many strains of a virus, or even among different species of virus in the same family, so a single drug will have broad effectiveness. Dozens of “antiviral” treatments are now available, and a lot are currently under development. Most of the antivirals now available are designed to help deal with HIV, herpes virus, hepatitis B and C viruses and influenza viruses.
Viral life cycles vary in their precise details depending on the species of virus, but they all share a general pattern:
One of the major antivirals development approach is to interfere with the ability of a virus to get into a target cell. The virus has to take a sequence of actions to do this, beginning with binding to a specific receptor molecule on the surface of the host cell and ending with the virus “un-coating” inside the cell and releasing its payload. Viruses that have a lipid envelope must also fuse their envelope with the target cell, or with a vesicle that transports them into the cell, before they can uncoated. All these steps involve the binding of viral proteins with one or more binding partners. Indeed, a number of “entry-inhibiting” or “entry-blocking” drugs are being developed to fight HIV. “Amantine” and “rimantadine” are two entry-blockers that have been developed to combat influenza virus. Amantine and rimantadine are thought to interfere with influenza A virus M2 protein, an ion channel protein, and to inhibit virus uncoating. However, Amantine and rimantadine do not work on influenza B viruses and the two drugs have been associated with gastro-intestinal and central nervous system adverse effects. Pleconaril, another entry-blocker, works against rhinoviruses, which cause most colds, by blocking a pocket on the surface of the virus that controls the un-coating process. This pocket is similar in most strains of rhinoviruses, and the drug also seems to work against “entero-virus”, which can cause diarrhea, meningitis, conjunctivitis, and encephalitis.
A second approach is to target the processes that synthesize virus components after a virus invades a cell. “Nucleotide or nucleoside analogues” are antivirals that will interfere and block the enzymes that synthesize the RNA or DNA once the analogue is incorporated. The first successful antiviral, “acyclovir”, is a nucleoside analogue, and is effective against herpes virus infections. Another nucleoside analogue named “zidovudine” or “AZT” has been approved for treating HIV. While, the newly synthesized RNA strands can be used immediately as template for translation and viral protein synthesis for some viruses as HCV, the HIV genome must first be integrated into the host cell genome before viral proteins could be produced. Integration in the host genome is performed with the help of the virally incoded integrase enzyme. As their name implies, integrase inhibitors, like raltegravir, work by blocking this process. Another class of antivirals that has been proven effective is the viral proteases inhibitors. Viral proteases act through binding to a target protein. However, protease inhibitors may have odd side-effects, for example causing fat to build up in unusual places. Then there is a need for improved protease inhibitors. The final stage in the life cycle of a virus is the release of completed viruses from the host cell, and of course this step has also been targeted by antiviral drug developers. Two drugs, named “zanamivir” and “oseltamivir” that have been recently introduced to treat influenza, prevent the release of viral particles by blocking a molecule named “neuraminidase” that is found on the surface of flu viruses, and also seems to be constant across a wide range of flu strains. Those two drugs block the active site of the influenza viral enzyme neuraminidase. However Oseltamivir has been associated with adverse effects such as nausea and vomiting. Zanamivir showed adverse respiratory events in persons with chronic pulmonary disease.
Therefore there is a great need to extend the activity, the specificity and the efficacy of current antivirals, but also to extend the range of antivirals to other families of pathogens.
Hepatitis C is a global health problem with 170 million carriers' worldwide, 3 to 4 million new cases each year and a worldwide mortality estimated to 500,000 persons a year. 30% of liver grafts are currently prescribed to patients infected with HCV. HCV is spread primarily by direct contact with human blood. Transmission through blood transfusions that are not screened for HCV infection, through the re-use of inadequately sterilized needles and syringes or other medical equipment or through needle-sharing among drug users, is well documented. Sexual and perinatal transmission may also occur, although less frequently.
The incubation period of HCV infection before the onset of clinical symptoms ranges from 15 to 150 days. About 80% of infected patients progress to develop chronic infection which can also be asymptomatic. Cirrhosis develops in about 10% to 20% of persons with chronic infection and liver cancer develops in 1% to 5% of persons with chronic infection over a period of 20 to 30 years.
The virus responsible for this post transfusion non A non B Hepatitis was identified in 1989. Hepatitis C virus is an enveloped virus from the Flaviviridae family and is the only member of hepacivirus genus. HCV comprises 6 genotypes, more than 45 subtypes and quasi-species patient-specific. Its positive single strand linear RNA has about 9,600 nucleotides. RNA genome is flanked by two untranslated regions (UTR) that play a major role in translation and replication of the viral genome. Upon interaction and fusion of viral and cellular membranes, RNA genome is released into the cytoplasm of a newly infected cell and serves as template for RNA replication. Viral genome replication is a two step process: the positive RNA strand is used as a matrix for the synthesis of a negative polarity RNA which in turn serves as matrix for the synthesis of positive RNA strands that will be incorporated in new virions. Translation of HCV genome depends on an internal ribosome entry site and produces a large polyprotein which is proteolytically cleaved by cellular and viral proteases to produce 10 viral proteins. The amino terminal one third of the polyprotein encodes the structural proteins: core protein glycoproteins E1+E2. After the structural region, comes a small integral protein, P7, which seems to function as an ion chemical. The remainder of the genome encodes the non structural proteins NS2, N3, NS4A, NS4B, NS5A & NS5B which coordinate the intracellular processes of the virus life cycle (Lindenbach et al., 2005). Replication complex is associated with membranes of the endoplasmic reticulum. Viral proteins involved in this complex are the NTPase/helicase/serine protease NS3-4A, NS4B which is involved in the formation of the replication web, NS5A whose function still remains to be elucidated and the RNA-dependent RNA polymerase NS5B. No vaccine is currently available to prevent hepatitis C. The standard treatment consists in a combination between Interferon, a cytokine with immuno-modulatory and antiviral activity (Moussalli et al., 1998) and Ribavirin, a synthetic guanosine nucleoside analogue (Hugle et al., 2003). For patients infected with HCV genotype 1a/1b (the predominant one in USA, Japan and Europe), the sustained viral response (loss of serum HCV RNA following 24 weeks of antiviral therapy) is at best 42-46% (Walker et al. 2002, Gordon et al., 2005; Lake-Bakaar et al., 2003).
Besides its relative inefficacy, this combination therapy yields significant side effects (Fried Michael, 2002). New treatment regimens are needed and, to address inefficiency and specificity issues, investigators have focused in recent years on the identification of drugs that specifically inhibit viral enzymes playing a key role in virus life-cycle.
Although all HCV enzymes are, in theory, equally appropriate for therapeutic intervention, the NS5B RNA polymerase and NS3-4A serine protease are respectively important for genome replication and polyprotein processing and were the most studied. NS5B polymerase is a 66 kD oligomeric, tail-anchored protein (Ivashkina et al., 2002; Schmidt-Mende et al., 2001). Its C-terminal 21 residues form a α-helical transmembrane domain responsible for post-translational targeting to the cytosolic side of the ER, where the functional protein domain is exposed (Moradpour et al., 2004; Schmidt-Mende et al., 2001). The crystal structure of NS5B revealed that the RdRp has a classical “fingers, palm and thumb” structure (Ago et al., 1999; Bressanelli et al., 1999; Lesburg et al., 1999). Unlike many cellular and other viral polymerase, interactions between the fingers and thumb subdomains result in a completely encircled catalytic site that ensures synthesis of positive- and negative-strand HCV RNAs (Lesburg et al., 1999). A unique feature is the presence of a β-harpin in the thumb subdomain that protrudes toward the active site and may thus restrict binding of the template/primer at the active site. NS5B catalyzes de novo, primer-independent initiation of RNA synthesis followed by elongation, termination of polymerization and release of nascent strand.
There is a need to find new compounds which can be used in the treatment of hepatitis C, and in particular having a HCV inhibitory activity and more particularly a HCV NS5B polymerase inhibitory activity, without the drawbacks of the prior art.
The present invention concerns a compound of the following formula I or a salt, solvate, tautomer, isotope, enantiomer, diastereoisomer or racemic mixture
in which
n is an integer chosen between 0, 1 or 2, advantageously n=0;
m is an integer chosen between 0, 1, 2 or 3, advantageously m=0;
C═Z represents CH2 or
Z represents an oxygen atom, a —CH—R group or a —N—OR group, in which R represents an hydrogen atom, a C1-C6 alkyl group, a C3-C6 cycloalkyl group, a 3-6 members heterocyclic group containing one or two heteroatoms selected in the group consisting of oxygen, nitrogen and sulfur atom, a (C1-C6 alkyl)COOH group, a (C1-C6 alkyl)O(C1-C6 alkyl) group or a O-protecting group; advantageously an oxygen atom or a —N—OR group in which R represent a C1-C6 alkyl group, a (C1-C6 alkyl)O(C1-C6 alkyl) group or a (C1-C6 alkyl)COOH group; in particular R represents a CH2—CH2—OMe group or a methyl group.
R1 represents a phenyl group, or a 5-9-members heteroaryl group containing one, two or three heteroatoms selected in the group consisting of oxygen, nitrogen and sulfur atom, advantageously nitrogen and sulfur atom, in particular a thiazol, a thiadiazol or a pyridine group, the phenyl group and the heteroaryl group being optionally substituted, in particular at the para position, by a halogen atom; a phenyl group; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom, in particular a fluorine atom, or by one or more OH group; a O—(C1-C6)alkyl-O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom; a —O—(C1-C6)alkyl-phenyl-O—(C1-C6)alkyl group; a C3-C6 cycloalkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkylCONR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; a —O—(C1-C6)alkylCOOH group; a 5-, 6- or 7-members heterocyclic group containing one, two or three heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom; or a —NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; In particular, the phenyl or the heteroaryl group is substituted, more particularly at the para position, by a halogen atom; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom, in particular a fluorine atom, or by one or more OH group; a —O—(C1-C6)alkylCONR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; a —O—(C1-C6)alkylCOOH group or a —NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group. Advantageously, the phenyl or the heteroaryl group is substituted, more particularly at the para position, by a halogen atom; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom, in particular a fluorine atom, or by one or more OH group or a —NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group. More advantageously, the phenyl or the heteroaryl group is substituted, more particularly at the para position, by a C1-C6 alkyl group, in particular a methyl or tert-butyl group, or a —OCF3 group, or a —CF3 group or a chlorine atom.
R2 represents a hydrogen atom if n≠0, or a phenyl group, or a 5-6-members heteroaryl group containing one, two or three heteroatom (s) selected in the group consisting of oxygen, sulfur and nitrogen atom, advantageously nitrogen and sulfur atom, or a benzodioxyl group or a C3-C6 cycloalkyl group, the phenyl group, the cycloalkyl group, the benzodioxyl group and the heteroaryl group being optionally substituted by one or more groups, advantageously one or two groups, independently selected among a halogen atom; a —OH group; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom; a C3-C6 cycloalkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a phenyl group; a —O-phenyl group; a —CN group; a —NO2 group; a —COOH group; a —COO(C1-C6 alkyl) group; a —C2-C6 alkenyl group; a —O—(C2-C6)alkenyl group; a —CONR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; a —NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; a —O-(6-members heterocyclic) group in which the heterocyclic group contains one, two or three heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom, advantageously nitrogen atom; a —O—((C1-C6)alkyl)-(6-members heterocyclic) group in which the heterocyclic group contains one, two or three heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom; a —O—((C1-C6)alkyl)-NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; and a 6-members heterocyclic group containing one, two or three heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom, advantageously nitrogen atom, the heterocyclic group being optionally substituted by a —O—((C1-C6)alkyl)-NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group;
Advantageously R2 represents a hydrogen atom if n≠0, or a phenyl group, or a 5-6-members heteroaryl group containing one, two or three heteroatom (s) selected in the group consisting of oxygen, sulfur and nitrogen atom, advantageously nitrogen and sulfur atom, in particular a thiazol, a thiadiazol or a pyridine group, or a benzodioxyl group, the phenyl group and the heteroaryl group being optionally substituted by one or more groups, advantageously one or two groups, independently selected among a halogen atom; a —OH group; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom; a C3-C6 cycloalkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a phenyl group; a —O-phenyl group; a —CN group; a —NO2 group; a —COOH group; a —COO(C1-C6 alkyl) group; a —C2-C6 alkenyl group; a —O—(C2-C6)alkenyl group; a —CONR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; a —NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; a —O-(6-members heterocyclic) group in which the heterocyclic group contains one, two or three heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom, advantageously nitrogen atom; a —O—(C1-C6)alkyl)-(6-members heterocyclic) group in which the heterocyclic group contains one, two or three heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom; a —O—((C1-C6)alkyl)-NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; and a 6-members heterocyclic group containing one, two or three heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom, advantageously nitrogen atom, the heterocyclic group being optionally substituted by a ((C1-C6)alkyl)-NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group;
In particular the phenyl or the heteroaryl group is substituted by one or more groups, advantageously one or two groups, independently selected among a halogen atom; a —OH group; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom; a —O-phenyl group; a —CN group; a —NO2 group; a —COOH group; a —COO(C1-C6 alkyl) group; a —O—(C2-C6)alkenyl group; or a —CONR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group. More advantageously the phenyl or heteroaryl group is substituted by one or more groups, advantageously one or two groups, independently selected among a halogen atom; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom; or a —COO(C1-C6 alkyl) group. Still more advantageously the phenyl or heteroaryl group is substituted by a C1-C6 alkyl group, in particular a methyl or tert-butyl group, or a —OCF3 group, or a —CF3 group or a chlorine atom or a —COO(C1-C6 alkyl) group in particular a —COOmethyl group.
X represents a nitrogen atom and Y represents a —C—R4 group or X represents a —C—R5 group and Y represents a nitrogen atom or X represents a —C—R5 group and Y represents a —C—R4 group, in which R4 and R5 represent, independently of each other, a hydrogen atom; a halogen atom; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a C3-C6 cycloalkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom, in particular a fluorine atom; a —COOH group; a —COO(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom in particular a fluorine atom; a —CN group; a phenyl group; a —S-phenyl-NO2 group; a —SO2-phenyl-NO2 group; a —SO2—(C1-C6)alkyl group; a —SO2-aryl group, advantageously a SO2-phenyl group; a —SO2—NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; a —SO2-(6-members heterocyclic) group containing one, two or three heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom; a —SO2—NH-aryl group; a 6-members heterocyclic group containing one or two heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom; or a —NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; or R4 and R5 form together with the carbon to which they are bonded a phenyl group optionally substituted by an halogen atom. Advantageously R4 and R5 represent, independently of each other a hydrogen atom; a halogen atom; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a C3-C6 cycloalkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom, in particular a fluorine atom; a —COOH group; a —COO(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom in particular a fluorine atom; a —CN group; a phenyl group; a —SO2-phenyl-NO2 group; a —SO2—(C1-C6)alkyl group; a —SO2-aryl group, advantageously a SO2-phenyl group; a —SO2—NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; a —SO2-(6-members heterocyclic) group containing one, two or three heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom; a —SO2—NH-aryl group; a 6-members heterocyclic group containing one or two heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom; or a —NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group;
or R4 and R5 form together with the carbon to which they are bonded a phenyl group optionally substituted by an halogen atom.
Advantageously R4 and R5 represent, independently of each other a hydrogen atom; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —COO(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom in particular a fluorine atom; a C3-C6 cycloalkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a phenyl group; a —SO2-phenyl-NO2 group; a —SO2—(C1-C6)alkyl group; a —SO2-aryl group, advantageously a SO2-phenyl group; a —SO2—NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; or a —SO2-(6-members heterocyclic) group containing one, two or three heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom or R4 and R5 form together with the carbon to which they are bonded a phenyl group optionally substituted by an halogen atom. More advantageously R4 and R5 represent, independently of each other a hydrogen atom; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —SO2-phenyl-NO2 group; or a phenyl group. Still more advantageously R4 and R5 represent, independently of each other a hydrogen atom; a C1-C6 alkyl group, in particular a methyl group, a —SO2-phenyl-NO2 group; or a phenyl group.
R3 represents a —OH group or a —O—(C1-C6)alkyl group or a —O—C═O—(C1-C6alkyl) group or a —NHR5 group in which R5 represents an hydrogen or a (C1-C6alkyl) group, a NH—C═OR7 in which R7 represents a (C1-C6alkyl) group or a —NHSO2R6 group in which R6 represents a hydrogen atom or a (C1-C6alkyl) group; Advantageously, R3 represents a —OH group or a —O—C═O—(C1-C6alkyl), in particular a —OH group or a —O—C═O—(CH3) group, more particularly a —OH group.
for the use in the treatment of hepatitis, in particular hepatitis C, more particularly as a hepatitis C polymerase inhibitor.
In a particular embodiment, the compound according to the present invention or a salt, solvate, tautomer, isotope, enantiomer, diastereoisomer or racemic mixture thereof is such that R1 represents a phenyl or a pyridyl group, in particular a phenyl group, optionally substituted, advantageously at the para position, by a halogen atom; a phenyl group; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom, in particular a fluorine atom, or by one or more OH group; a O—(C1-C6)alkyl-O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom; a —O—(C1-C6)alkyl-phenyl-O—(C1-C6)alkyl group; a C3-C6 cycloalkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkylCONR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; a —O—(C1-C6)alkylCOOH group; a 5-, 6- or 7-members heterocyclic group containing one, two or three heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom; or a —NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group.
In particular, the phenyl or the pyridyl group is substituted, more particularly at the para position, by a halogen atom; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom, in particular a fluorine atom, or by one or more OH group; a —O—(C1-C6)alkylCONR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; a —O—(C1-C6)alkylCOOH group or a —NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group. Advantageously, the phenyl or the pyridyl group is substituted, more particularly at the para position, by a halogen atom; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom, in particular a fluorine atom, or by one or more OH group or a —NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group. More advantageously, the phenyl or the pyridyl group is substituted, more particularly at the para position, by a C1-C6 alkyl group, in particular a methyl or tert-butyl group, or a —OCF3 group, or a —CF3 group or a chlorine atom.
In a further particular embodiment, the compound according to the present invention or a salt, solvate, tautomer, isotope enantiomer, diastereoisomer or racemic mixture thereof is such that R2 represents a phenyl group or a pyridyl group, in particular a phenyl group, optionally substituted, by one or more groups, advantageously one group more advantageously at the para position, independently selected among a halogen atom; a —OH group; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom; a C3-C6 cycloalkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a phenyl group; a —O-phenyl group; a —CN group; a —NO2 group; a —COOH group; a —COO(C1-C6 alkyl) group; a —C2-C6 alkenyl group; a —O—(C2-C6)alkenyl group; a —CONR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; a —NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; a —O-(6-members heterocyclic) group in which the heterocyclic group contains one, two or three heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom, advantageously nitrogen atom; a —O—(C1-C6)alkyl)-(6-members heterocyclic) group in which the heterocyclic group contains one, two or three heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom; a —O—((C1-C6)alkyl)-NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; and a 6-members heterocyclic group containing one, two or three heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom, advantageously nitrogen atom, the heterocyclic group being optionally substituted by a —((C1-C6)alkyl)-NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group.
In particular the phenyl or the pyridyl group is substituted by one or more groups, advantageously one or two groups, independently selected among a halogen atom; a —OH group; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom; a —O-phenyl group; a —CN group; a —NO2 group; a —COOH group; a —COO(C1-C6 alkyl) group; a —O—(C2-C6)alkenyl group; or a —CONR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group. More advantageously the phenyl or pyridyl group is substituted by one or more groups, advantageously one or two groups, independently selected among a halogen atom; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom; or a —COO(C1-C6 alkyl) group. Still more advantageously the phenyl or pyridyl group is substituted by a C1-C6 alkyl group, in particular a methyl or tert-butyl group, or a —OCF3 group, or a —CF3 group or a chlorine atom or a —COO(C1-C6 alkyl) group in particular a —COOmethyl group.
In another particular embodiment, the compound according to the present invention or a salt, solvate, tautomer, isotope enantiomer, diastereoisomer or racemic mixture thereof is such that X represents a nitrogen atom and Y represents a —C—R4 group or X represents a —C—R5 group and Y represents a nitrogen atom in which R4 and R5 represent, independently of each other, a hydrogen atom; a halogen atom; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a C3-C6 cycloalkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom, in particular a fluorine atom; a —COOH group; a —COO(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom in particular a fluorine atom; a —CN group; a phenyl group; a 6-members heterocyclic group containing one or two heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom; or a —NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group.
Advantageously R4 and R5 represent, independently of each other a hydrogen atom; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —COO(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom in particular a fluorine atom; a C3-C6 cycloalkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; or a phenyl group. More advantageously R4 and R5 represent, independently of each other a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; or a phenyl group. Still more advantageously R4 and R5 represent, independently of each other a C1-C6 alkyl group, in particular a methyl group, or a phenyl group.
In still another particular embodiment, the compound according to the present invention or a salt, solvate, tautomer, isotope enantiomer, diastereoisomer or racemic mixture thereof is such that X represents a —C—R5 group and Y represents a —C—R4 group in which R4 and R5 represent, independently of each other a hydrogen atom; a halogen atom; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a C3-C6 cycloalkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —O—(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom, in particular a fluorine atom; a —COOH group; a —COO(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom in particular a fluorine atom; a —CN group; a —SO2-phenyl-NO2 group; a —SO2—(C1-C6)alkyl group; a —SO2-aryl group, advantageously a SO2-phenyl group; a —SO2—NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; a —SO2-(6-members heterocyclic) group containing one, two or three heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom; a —SO2—NH-aryl group; a 6-members heterocyclic group containing one or two heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom; or a —NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group;
or R4 and R5 form together with the carbon on which they are bonded a phenyl group optionally substituted by an halogen atom.
Advantageously R4 and R5 represent, independently of each other a hydrogen atom; a C1-C6 alkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —COO(C1-C6)alkyl group in which the alkyl group is optionally substituted by one or more halogen atom in particular a fluorine atom; a C3-C6 cycloalkyl group optionally substituted by one or more halogen atom, in particular a fluorine atom; a —SO2-phenyl-NO2 group; a —SO2—(C1-C6)alkyl group; a —SO2-aryl group, advantageously a SO2-phenyl group; a —SO2—NR′R″ group in which R′ and R″ represent independently of each other a hydrogen atom or a C1-C6 alkyl group; or a —SO2-(6-members heterocyclic) group containing one, two or three heteroatoms selected in the group consisting of nitrogen, sulfur and oxygen atom or R4 and R5 form together with the carbon to which they are bonded a phenyl group optionally substituted by an halogen atom. More advantageously R4 and R5 represent, independently of each other a hydrogen atom or a —SO2-phenyl-NO2 group. Still more advantageously one between R4 and R5 represent a —SO2-phenyl-NO2 group and the other one a hydrogen atom.
Advantageously, the compound, a salt, solvate, tautomer, isotope, enantiomer, diastereoisomer or racemic mixture thereof, useful for the treatment of hepatitis, in particular hepatitis C, more particularly as a hepatitis C polymerase inhibitor according to the present invention, is chosen from the group consisting of the compounds of the following formula 1-36, 39-133.
The compounds useful in the present invention can be prepared by methods well known in the art. In particular they can be prepared by the general procedure A, B, C, D, or E as described bellow. Some of them are also commercially available at Chemdiv or Enamine.
The present invention also concerns a pharmaceutical composition comprising a compound as defined above or a salt, solvate, tautomer, isotope, enantiomer, diastereoisomer or racemic mixture thereof, a pharmaceutically acceptable diluent or carrier and a further antiviral agent selected in the group consisting of ribavirin, interferon, inhibitors of HCV helicase, inhibitors of HCV protease, inhibitors of HCV NS4A, inhibitors of HCV NS5B, inhibitors of HCV NS5A, HBV inhibitors and mixture thereof.
The present invention concerns also a compound of formula 1, 2, 4-9, 11-27, 29, 30, 33-36, 39, 41-50 and 125-131 as defined above or a salt, solvate, tautomer, isotope, enantiomer, diastereoisomer or racemic mixture thereof.
The present invention concerns also a pharmaceutical composition comprising a compound of formula 1, 2, 4-9, 11-27, 29, 30, 33-36, 39, 41-50 and 125-131 as defined above or a salt, solvate, tautomer, isotope, enantiomer, diastereoisomer or racemic mixture thereof and a pharmaceutically acceptable diluent or carrier. Advantageously, the composition according to the present invention is useful as a drug, in particular as an antiviral drug.
More advantageously, it is useful as a drug intended to treat hepatitis, in particular hepatitis C, for example as a hepatitis C polymerase inhibitor.
The present invention also concerns a product containing a compound as defined above or a salt, solvate, tautomer, isotope, enantiomer, diastereoisomer or racemic mixture thereof and at least another antiviral agent in particular selected in the group consisting of ribavirin, interferon, inhibitors of HCV helicase, inhibitors of HCV protease, inhibitors of HCV NS4A, inhibitors of HCV NS5B, inhibitors of HCV NS5A, inhibitors of HCV polymerase, HBV inhibitors and mixture thereof, as a combined preparation for simultaneous, separate or sequential use in hepatitis therapy, in particular in patients who do not have the HIV disease.
Therefore the compound as defined in the present invention can be used as a bi- or tri-therapy in order to treat hepatitis C with another anti-hepatitis C antiviral agent (ribavirin, interferon, inhibitors of HCV helicase, inhibitors of HCV protease, inhibitors of HCV NS4A, inhibitors of HCV NS5B, inhibitors of HCV NS5A, inhibitors of HCV polymerase or mixture thereof) or even as a bi or tri-therapy with one or several anti-HIV antiviral agent in order to treat hepatitis C in a patient having HIV disease or finally as a tri-therapy with another anti-hepatitis C antiviral agent and an anti-HIV antiviral agent in order to treat hepatitis C in a patient having HIV disease.
By antiviral agent it is meant any of several drugs used to treat or prevent viral infections. The drugs act by interfering with a virus's ability to enter a host cell and replicate itself with the host cell's DNA. Some drugs block the virus's attachment or entry into the cell; others inhibit replication or prevent the virus from shedding the protein coat that surrounds the viral DNA.
Antiviral agents or drugs are now available for a wide variety of viral diseases. For example, Ribavirin, available since the mid-1980s, is used to treat respiratory syncytial virus (RSV), a cause of severe childhood respiratory infections. It is thought to inhibit messenger RNA. Amantadine and rimantadine, which are effective against strains of influenza A, act by interfering with viral uncoating.
The compounds of the present invention may also be present in the form of pharmaceutically acceptable salts. For use in medicine, the salts of the compounds of this invention refer to non-toxic “pharmaceutically acceptable salts.” Pharmaceutically acceptable salt forms include pharmaceutically acceptable acidic/anionic or basic/cationic salts. Pharmaceutically acceptable salts of the acidic or basic compounds of the invention can of course be made by conventional procedures, such as by reacting the free base or acid with at least a stoichiometric amount of the desired salt-forming acid or base. Pharmaceutically acceptable salts of the acidic compounds of the invention include salts with inorganic cations such as sodium, potassium, calcium, magnesium, zinc, and ammonium, and salts with organic bases. Suitable organic bases include N-methyl-D-glucamine, arginine, benzathine, diolamine, olamine, procaine and tromethamine. Pharmaceutically acceptable salts of the basic compounds of the invention include salts derived from organic or inorganic acids. Suitable anions include acetate, adipate, besylate, bromide, camsylate, chloride, citrate, edisylate, estolate, fumarate, gluceptate, gluconate, glucuronate, hippurate, hyclate, hydrobromide, hydrochloride, iodide, isethionate, lactate, lactobionate, maleate, mesylate, methylbromide, methylsulphate, napsylate, nitrate, oleate, pamoate, phosphate, polygalacturonate, stearate, succinate, sulphate, sulphosalicylate, tannate, tartrate, terephthalate, tosylate and triethiodide. Hydrochloride salts are particularly preferred.
It is anticipated that the compounds of the invention can be administered by oral or parenteral routes, intestinal, ocular, vaginal, rectal nasal (intranasal), pulmonary or other mucosal, transdermal and topical administration, and inhalation, advantageously by oral route. Primary routes for parenteral administration include intravenous, intramuscular, and subcutaneous administration. Secondary routes of administration include intraperitoneal, intra-arterial, intra-articular, intracardiac, intracisternal, intradermal, intralesional, intraocular, intrapleural, intrathecal, intrauterine, and intraventricular administration. For oral administration, the compounds of the invention will generally be provided in the form of tablets or capsules or as an aqueous solution or suspension. Tablets for oral use may include the active ingredient mixed with pharmaceutically acceptable excipients such as inert diluents, disintegrating agents, binding agents, lubricating agents, sweetening agents, flavouring agents, colouring agents and preservatives. Suitable inert diluents include sodium and calcium carbonate, sodium and calcium phosphate and lactose. Corn starch and alginic acid are suitable disintegrating agents. Binding agents may include starch and gelatine. The lubricating agent, if present, will generally be magnesium stearate, stearic acid or talc. If desired, the tablets may be coated with a material such as glyceryl monostearate or glyceryl distearate, to delay absorption in the gastrointestinal tract. Capsules for oral use include hard gelatine capsules in which the active ingredient is mixed with a solid diluent and soft gelatine capsules wherein the active ingredient is mixed with water or an oil such as peanut oil, liquid paraffin or olive oil.
For intramuscular, intraperitoneal, subcutaneous and intravenous use, the compounds of the invention will generally be provided in sterile aqueous solutions or suspensions, buffered to an appropriate pH and isotonicity. Suitable aqueous vehicles include Ringer's solution and isotonic sodium chloride. Aqueous suspensions according to the invention may include suspending agents such as cellulose derivatives, sodium alginate, polyvinyl-pyrrolidone and gum tragacanth, and a wetting agent such as lecithin. Suitable preservatives for aqueous suspensions include ethyl and n-propyl p-hydroxybenzoate.
The pharmaceutical compositions of the present invention may, in particular, comprise more than one agent (multiple) of the present invention, e.g., two or more agents. The invention also provides a pharmaceutical preparation or system, comprising (a) a first agent, which is an agent of the invention; and (b) a second pharmaceutical agent. Said multiple agents of the invention or said first and second agents are formulated either in admixture or as separate compositions, e.g. for simultaneous though separate, or for sequential administration (see below).
The compositions of the present invention can be delivered directly or in pharmaceutical compositions containing excipients (see above), as is well known in the art. The present methods of treatment involve administration of a therapeutically effective amount of an agent of the present invention to a subject. The term “therapeutically effective amount” as used herein refers to an amount of an agent according to the present invention needed to treat or ameliorate the targeted disease condition, or to exhibit a detectable therapeutic effect or a prolongation of survival in a patient. In general, the therapeutically effective dose can be estimated initially either in cell culture assays or in animal models, for example, in non-human primates, mice, rabbits, dogs, or pigs. The animal model may also be used to determine the appropriate concentration range and route of administration. Such information can then be used to determine useful doses and routes for administration in humans. Effective doses of the compounds of the present invention may be ascertained by conventional methods. The specific dosage level required for any particular patient will depend on a number of factors, including severity of the condition being treated, the route of administration, the general health of the patient (i.e. age, weight and diet) in particular if he is a HIV patient, the gender of the patient, the time and frequency of administration, and tolerance/response to therapy. In general, however, the daily dose (whether administered as a single dose or as divided doses) will be in the range 0.001 to 5000 mg per day, more usually from 1 to 2500 mg per day, and most usually from 10 to 1500 mg per day. Alternatively, dosages can be administered per unit body weight and in this instance a typical dose will be between 0.01 μg/kg and 50 mg/kg, especially between 10 μg/kg and 10 mg/kg, between 100 μg/kg and 2 mg/kg. An advantage of the compounds of the present invention is that they permit administration to be limited to one, two, three or four times weekly or monthly.
The present compositions may, if desired, be presented in a pack or dispenser device containing one or more unit dosage forms containing the active ingredient. Such a pack or device may, for example, comprise metal or plastic foil, such as a blister pack, or glass and rubber stoppers such as in vials. The pack or dispenser device may be accompanied by instructions for administration. Compositions comprising an agent of the invention formulated in a compatible pharmaceutical carrier may also be prepared, placed in an appropriate container, and labelled for treatment of an indicated condition.
The terms “comprising” and “comprises” means “including” as well as “consisting” e.g. a composition “comprising” X may consist exclusively of X or may include something additional e.g. X+Y.
The word “substantially” does not exclude “completely” e.g. a composition which is “substantially free” from Y may be completely free from Y. Where necessary, the word “substantially” may be omitted from the definition of the invention.
“Optional” or “optionally” means that the subsequently described event or circumstances may or may not occur, and that the description includes instances where said event or circumstance occurs and instances in which it does not.
Where the compounds according to this invention have at least one chiral centre, they may accordingly exist as enantiomers. Where the compounds possess two or more chiral centres, they may additionally exist as diastereomers. Where the processes for the preparation of the compounds according to the invention give rise to mixture of stereoisomers, these isomers may be separated by conventional techniques such as preparative chromatography. The compounds may be prepared in racemic form or individual enantiomers may be prepared by standard techniques known to those skilled in the art, for example, by enantiospecific synthesis or resolution, formation of diastereomeric pairs by salt formation with an optically active acid, followed by fractional crystallization and regeneration of the free base. The compounds may also be resolved by formation of diastereomeric esters or amides, followed by chromatographic separation and removal of the chiral auxiliary. Alternatively, the compounds may be resolved using a chiral HPLC column. It is to be understood that all such isomers and mixtures thereof in all proportion are encompassed within the scope of the present invention.
Where any particular moiety is substituted, for example a phenyl group comprising a substituent on the aryl ring, unless specified otherwise, the term “substituted” contemplates all possible isomeric forms. For example, substituted phenyl includes all of the following ortho-, meta- and para-permutations:
However, in general para substitution is preferred.
As used herein the term <<tautomer>> refers to isomers of the compounds according to the present invention that readily interconvert by a chemical reaction called tautomerization. Commonly this reaction results in the formal migration of a hydrogen atom or proton, accompanied by a switch of a single bond and adjacent double bond. In solutions where tautomerization is possible, a chemical equilibrium of the tautomers will be reached. The exact ratio of the tautomers depends on several factors, including temperature, solvent, and pH. The concept of tautomers that are interconvertible by tautomerizations is called tautomerism.
Common tautomeric pairs are: ketone-enol; amide-imidic acid; lactam-lactim, an amide-imidic acid tautomerism in heterocyclic rings; enamine-imine; enamine-enamine. In particular it can include ring-chain tautomerism which occurs when the movement of the proton is accompanied by a change from an open structure to a ring.
As used herein the term <<isotope>> refers to two molecules which differ only in the isotopic nature of their atoms i.e. their atom have a different atomic mass (mass number). Isotopes of an atom have nuclei with the same number of protons (the same atomic number) but different numbers of neutrons. Therefore, isotopes have different mass numbers, which give the total number of nucleons, the number of protons plus neutrons. In particular in the present invention an isotope of a compound can comprise one deuterium atom in place of a hydrogen atom.
The term “halogen” is used herein to refer to any of fluorine, chlorine, bromine and iodine. Most usually, however, halogen substituents in the compounds of the invention are chlorine, bromine and fluorine substituents, in particular chlorine or fluorine substituents.
The term “O-Protecting group” as used in the present invention refers to a substituent which protects hydroxyl groups against undesirable reactions during synthetic procedures. O-protecting groups comprise substituted methyl ethers, for example, methoxymethyl (MOM), benzyloxymethyl, 2-methoxyethoxymethyl, 2-(trimethylsilyl)ethoxymethyl, t-butyl, benzyl and triphenylmethyl, tetrahydropyranyl ethers, substituted ethyl ethers, for example, 2,2,2-trichloroethyl, silyl ethers, for example, trimethylsilyl, t-butyldimethylsilyl (TBS) and t-butyldiphenylsilyl; and esters prepared by reacting the hydroxyl group with a carboxylic acid for example, acetate, propionate, benzoate and the like. In particular an allyl or an acetyl group is an “O-Protecting group” according to the present invention.
As used herein, the term “alkyl” refers to a straight or branched saturated monovalent hydrocarbon radical, having the number of carbon atoms as indicated. For example, the term “C1-C6-alkyl” includes C1, C2, C3, C4, C5 and C6 alkyl groups. By way of non-limiting example, suitable alkyl groups include methyl, ethyl, propyl, iso-propyl, butyl, iso-butyl, tert-butyl, pentyl and hexyl, in particular methyl, iso-propyl or tert-butyl. In one aspect of the present invention ranges of alkyl groups are: C1-C6-alkyl, C1-C5-alkyl, C1-C4-alkyl, C1-C3-alkyl and C1-C2-alkyl, in particular C1-C3-alkyl. As used herein, the term “cycloalkyl” refers to a cyclic saturated hydrocarbon radical, having the number of carbon atoms as indicated. For example, the term “C3-C6-cycloalkyl” includes C3, C4, C5 and C6 cycloalkyl groups. By way of non-limiting example, suitable cycloalkyl groups include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclopropylmethyl, cyclopropylethyl, cyclobutylmethyl, cyclobutylethyl and cyclopentylmethyl, in particular cyclohexyl. In one aspect of the present invention ranges of alkyl groups are: C3-C6-cycloalkyl, C3-C5-cycloalkyl and C3-C4-cycloalkyl.
As used herein, the term “aryl” refers to monovalent unsaturated aromatic carbocyclic radical having one, two, or three rings, which may be fused or bicyclic. In one aspect of the present invention, the term “aryl” refers to an aromatic monocyclic ring containing 5 or 6 carbon atoms, which may be substituted on the ring with 1, 2, 3, 4 or 5 substituents as defined herein; an aromatic bicyclic or fused ring system containing 7, 8, 9 or 10 carbon atoms, which may be substituted on the ring with 1, 2, 3, 4, 5, 6, 7, 8 or 9 substituents as defined herein; or an aromatic tricyclic ring system containing 10 carbon atoms, which may be substituted on the ring with 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or 13 substituents as defined herein. By way of non-limiting example, suitable aryl groups include phenyl, biphenyl, indanyl, azulenyl, tetrahydronaphthyl, tolyl, chlorophenyl, dichlorophenyl, trichlorophenyl, methoxyphenyl, dimethoxyphenyl, trimethoxyphenyl, fluorophenyl, difluorophenyl, trifluorophenyl, nitrophenyl, dinitrophenyl, trinitrophenyl, aminophenyl, diaminophenyl, triaminophenyl, cyanophenyl, chloromethylphenyl, tolylphenyl, chloroethylphenyl, trichloromethylphenyl, dihydroindenyl, benzocycloheptyl and trifluoromethylphenyl, advantageously a phenyl. In one aspect of the present invention ranges of aryl groups are: C3-10-aryl, C3-6-aryl C4-9-aryl, C5-8-aryl and C6-7-aryl.
As used herein, the term “heteroaryl” refers to monovalent unsaturated aromatic heterocyclic radicals having one ring. Suitably, the term “6-members heteroaryl” encompasses heteroaryl moieties that are aromatic monocyclic ring systems containing six members of which at least one member is a N, O or S atom and which optionally depending of the case can contain one, two or three additional N, O or S atoms, advantageously N atoms. Suitably, the term “5-members heteroaryl” encompasses heteroaryl moieties that are aromatic monocyclic ring systems containing five members of which at least one member is a N, O or S atom and which optionally depending of the case can contain one, two or three additional N, O or S atoms, advantageously N atoms. By way of non-limiting example, suitable heteroaryl groups include furanyl, pyridyl, thiophenyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, isothiazolyl, oxazolyl, oxadiazolyl, isoxazolyl, pyrazinyl, and oxazinyl
The term “heterocyclic” refers to a saturated or partially unsaturated ring having five members of which at least one member is a N, O or S atom and which optionally contains one additional O atom or one or two N atoms; a saturated or partially unsaturated ring having six members of which one, two or three members are an N, O or S atom and which optionally contains one additional O atom or one, or two additional N atoms; a saturated or partially unsaturated ring having seven members of which one, two or three members are an N, O or S atom and which optionally contains one additional O atom or one or two additional N atoms. Typically, heterocycles comprising peroxide groups are excluded from the definition of heterocyclic. By way of non-limiting example, suitable heterocyclic groups include pyrrolinyl, pyrrolidinyl, dioxolanyl, tetrahydrofuranyl, morpholinyl, imidazolinyl, imidazolidinyl, pyrazolidinyl, piperidinyl, dihydropyranyl, tetrahydropyranyl and piperazinyl.
As used herein, the term “alkenyl” refers to a straight or branched unsaturated monovalent hydrocarbon radical, having the number of carbon atoms as indicated, and the distinguishing feature of a carbon-carbon double bond. For example, the term “C2-C6-alkenyl” includes C2, C3, C4, C5, and C6 alkenyl groups. By way of non-limiting example, suitable alkenyl groups include ethenyl, propenyl, butenyl, pentenyl, and hexenyl, in particular a propenyl group, wherein the double bond may be located anywhere in the carbon chain. In one aspect of the present invention ranges of alkenyl groups are: C2-C6-alkenyl, C2-s-alkenyl, C2-4-alkenyl and C2-3-alkenyl.
The compounds according to the present invention have been prepared and tested as described above in a non limiting way
The significations of the abbreviations are as follow:
s: singlet
brs: broad singlet
d: doublet
brd: broad doublet
t: triplet
q: quadruplet
quint: quintuplet
dd: doubled doublet
dt: doubled triplet
dq: doubled quadruplet
sept: septuplet
m: multiplet
Commercial compounds were purchased from Acros Organics, Sigma-Aldrich, Alfa Aesar, Interchim and Maybridge.
(R1, R2, X and Y are as defined above).
The aldehyde (1 eq) and the amine (1 eq) were dissolved in AcOH (2 ml/mmol). After 15 min at room temperature, the keto-ester (1 eq) in AcOH (2 ml/mmol) was added. The solution was stirred 30 min at 160° C. in micro-waves apparatus. After filtration of the mixture, the solid was washed with Et2O or Et2O/MeOH (0.5%) to give the titled compound. When the reaction mixture was homogeneous, it was concentrated under vacuum and the residue was triturated in Et2O then filtered. When the purity was insufficient, the residue was purified by flash chromatography (silica gel) or HPLC semi-preparative with the appropriate gradient determined by TLC.
The following compounds were prepared according general procedure A:
Prepared from 4-tert-butylbenzaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 2-hydroxy-4-oxo-6-phenyl-hex-2-enoic acid ethyl ester in 23% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.21 (brs, 9H); 2.71 (t, 2H); 3.0 (m, 2H); 5.89 (s, 1H); 7-7.3 (m, 9H); 8.23 (d, 2H); 8.31 (s, 1H); 8.38 (d, 2H); MS (ESI+): m/z=632 [M+H]+;
Melting point: 172° C.
Prepared from 4-carboxybenzaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 2-hydroxy-4-oxo-4-p-tolyl-but-2-enoic acid ethyl ester in 17% yield. 1H-NMR (DMSO-d6): δ (ppm) 2.32 (s, 3H); 6.18 (s, 1H); 7.24 (d, 2H); 7.54-7.59 (dd, 4H); 7.77 (d, 2H); 8.23-8.27 (m, 3H); 8.39 (d, 2H); MS (ESI+): m/z=606 [M+H]+;
Melting point: 308-309° C.
Prepared from methyl 4-formylbenzoate, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 2-hydroxy-4-oxo-4-p-tolyl-but-2-enoic acid ethyl ester in 22% yield. 1H-NMR (DMSO-d6): δ (ppm) 2.33 (s, 3H); 3.77 (s, 3H); 6.19 (s, 1H); 7.23 (d, 2H); 7.55-7.58 (dd, 4H); 7.78 (d, 2H); 8.18-8.37 (m, 5H); MS (ESI+): m/z=620 [M+H]+; Melting point: 249-251° C.
Prepared from 4-isopropylbenzaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 2-hydroxy-4-oxo-4-pyridin-3-yl-but-2-enoic acid ethyl ester in 15% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.09 (d, 6H); 2.71-2.82 (m, 1H); 6.07 (s, 1H); 7.08 (d, 2H); 7.35 (d, 2H); 7.59-7.65 (m, 1H); 8.24 (dd, 2H); 8.31 (s, 1H); 8.39 (dd, 2H); 8.73 (dd, 1H); 8.93 (brs, 1H); MS (ESI+): m/z=591 [M+H]+
Prepared from benzaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 2-hydroxy-4-oxo-4-p-tolyl-but-2-enoic acid ethyl ester in 23% yield. 1H-NMR (DMSO-d6): δ (ppm) 2.33 (s, 3H); 6.13 (s, 1H); 7.18-7.25 (m, 5H); 7.39 (d, 2H); 7.62 (d, 2H); 8.23-8.28 (m, 3H); 8.40 (dd, 2H); MS (ESI+): m/z=562 [M+H]+
Prepared from 1-methyl-M-pyrazole-3-carbaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 2-hydroxy-4-oxo-4-p-tolyl-but-2-enoic acid ethyl ester in 26% yield. 1H-NMR (DMSO-d6): δ (ppm) 2.35 (s, 3H); 3.62 (s, 3H); 6.23 (s, 1H); 6.29 (d, 1H); 7.28 (d, 2H); 7.44 (d, 1H); 7.65 (d, 2H); 8.29 (d, 2H); 8.41 (s, 1H); 8.44 (d, 2H); MS (ESI+): m/z=566 [M+H]+
Prepared from 4-isopropylbenzaldehyde, 5-methanesulfonyl-thiazol-2-ylamine and 2-hydroxy-4-oxo-4-p-tolyl-but-2-enoic acid ethyl ester in 22% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.10 (d, 6H); 2.35 (s, 3H); 2.77 (quint, 1H); 3.37 (s, 3H); 6.17 (s, 1H); 7.12 (d, 2H); 7.27 (d, 2H); 7.37 (d, 2H); 7.65 (d, 2H); 8.05 (s, 1H); MS (ESI+): m/z=497 [M+H]+; Melting point: 269-271° C.
Prepared from 4-isopropylbenzaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 4-(4-tert-butyl-phenyl)-2-hydroxy-4-oxo-but-2-enoic acid ethyl ester in 14% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.08 (d, 6H); 1.27 (s, 9H); 2.74-2.75 (m, 1H); 6.11 (s, 1H); 7.08 (d, 2H); 7.33 (d, 2H); 7.46 (d, 2H); 7.68 (d, 2H); 8.25 (d, 2H); 8.32 (s, 1H); 8.41 (d, 2H) MS (ESI+): m/z=646 [M+H]+
Prepared from 4-isopropylbenzaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 2-hydroxy-4-oxo-5-phenyl-pent-2-enoic acid ethyl ester in 12% yield. Note: the crude product was diluted in DMSO and MeOH then filtered. The solid was triturated again in MeOH then filtered to give the desired compound. 1H-NMR (DMSO-d6): δ (ppm) 1.12 (d, 6H); 2.79 (m, 1H); 4.06 (s, 2H); 5.89 (s, 1H); 7.0-7.18 (m, 9H); 8.23 (d, 2H); 8.32 (s, 1H); 8.40 (d, 2H); MS (ESI+): m/z=604 [M+H]+
Prepared from 3-pyridinecarboxaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 2-hydroxy-4-oxo-4-p-tolyl-but-2-enoic acid ethyl ester in 30% yield. 1H-NMR (DMSO-d6): δ (ppm) 2.33 (s, 3H); 6.15 (s, 1H); 7.22-7.27 (m, 3H); 7.65 (d, 2H); 7.93 (brd, 1H); 8.28-8.41 (m, 6H); 8.73 (brs, 1H); MS (ESI+): m/z=563 [M+H]+; Melting point: 211° C.
Prepared from 4-isopropylbenzaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 2-hydroxy-4-oxo-4-(4-trifluoromethoxy-phenyl)-but-2-enoic acid ethyl ester in 7% yield. Note: the residue was purified by HPLC semi-preparative then triturated in diethyl ether to give the desired compound. 1H-NMR (DMSO-d6): δ (ppm) 1.09 (d, 6H); 2.73-2.79 (m, 1H); 6.10 (s, 1H); 7.09 (d, 2H), 7.34 (d, 2H); 7.45 (d, 2H); 7.85 (d, 2H); 8.25 (d, 2H); 8.33 (s, 1H); 8.40 (d, 2H); MS (ESI+): m/z=674 [M+H]+
Prepared from 4-isopropylbenzaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 2,4-dioxo-4-pyridin-2-yl-butyric acid ethyl ester in 2% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.10 (d, 6H); 2.77 (m, 1H); 6.09 (s, 1H); 7.08 (d, 2H); 7.31 (d, 2H); 8.01-8.06 (m, 1H); 8.14-8.42 (m, 7H); 9.0 (m, 1H); MS (ESI+): m/z=591 [M+H]+
Prepared from 4-isopropylbenzaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 2-hydroxy-4-oxo-6-phenyl-hex-2-enoic acid ethyl ester in 4% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.13 (d, 6H); 2.69-3.01 (m, 5H); 5.89 (s, 1H); 7.08-7.20 (m, 9H); 8.23 (d, 2H); 8.30 (s, 1H); 8.38 (d, 2H); MS (ESI+): m/z=618 [M+H]+
Prepared from 1-methyl-M-imidazole-5-carbaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 2-hydroxy-4-oxo-4-p-tolyl-but-2-enoic acid ethyl ester in 11% yield. 1H-NMR (DMSO-d6): δ (ppm) 2.32 (s, 3H); 4.2 (s, 3H); 6.09 (s, 1H); 7.14 (d, 2H); 7.56 (s, 1H); 7.82-7.85 (d, 2H); 8.24-8.29 (m, 3H); 8.39-8.43 (d, 2H); 8.86 (s, 1H). MS (ESI+): m/z=566 [M+H]+
Prepared from 4-isopropylbenzaldehyde, 5-benzenesulfonyl-thiazol-2-ylamine and 2-hydroxy-4-oxo-4-p-tolyl-but-2-enoic acid ethyl ester in 16% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.08 (d, 6H); 2.33 (s, 3H); 2.73 (quint, 1H); 6.10 (s, 1H); 7.08 (d, 2H); 7.23-7.33 (dd, 4H); 7.60-7.73 (m, 6H); 7.98 (dd, 2H); 8.19 (s, 1H); MS (ESI+): m/z=559 [M+H]+
Prepared from 4-tert-butylbenzaldehyde, 2-amino-1,3,4-thiadiazole and 2-hydroxy-4-(4-methoxy-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 27% yield. Note: the reaction mixture was refluxed for 4 h. 1H-NMR (DMSO-d6): δ (ppm) 1.16 (s, 9H); 3.81 (s, 3H); 6.18 (s, 1H); 6.96 (d, 2H); 7.27-7.33 (dd, 4H); 7.73 (d, 2H); 9.23 (brs, 1H); 12.04 (brs, 1H); MS (ESI+): m/z=450 [M+H]+; Melting point: 289-291° C.
Prepared from methyl 4-formylbenzoate, 2-amino-5-methyl-1,3,4-thiadiazole and 2-hydroxy-4-(4-methoxy-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 25% yield. Note: the solution was stirred 30 min at 150° C. then 15 min at 160° C. in micro-waves apparatus. 1H-NMR (DMSO-d6): δ (ppm) 2.59 (s, 3H); 3.77 (s, 3H); 3.81 (s, 3H); 6.23 (s, 1H); 6.97 (d, 2H); 7.56 (d, 2H); 7.73 (d, 2H); 7.82 (d, 2H); MS (ESI+): m/z=466 [M+H]+; Melting point: 255-257° C.
Prepared from 4-(trifluoromethoxy)benzaldehyde, 2-amino-5-methyl-1,3,4-thiadiazole and 2-hydroxy-4-(4-methoxy-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 9% yield. 1H-NMR (DMSO-d6): δ (ppm) 2.60 (s, 3H); 3.82 (s, 3H); 6.20 (s, 1H); 6.98 (d, 2H); 7.23 (d, 2H); 7.58 (d, 2H); 7.76 (d, 2H); MS (ESI+): m/z=492 [M+H]+; Melting point: 245-247° C.
Prepared from 4-carboxybenzaldehyde, 2-amino-5-methyl-1,3,4-thiadiazole and 2-hydroxy-4-(4-methoxy-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 40% yield. 1H-NMR (DMSO-d6): δ (ppm) 2.59 (s, 3H); 3.81 (s, 3H); 6.23 (s, 1H); 6.98 (d, 2H); 7.53 (d, 2H); 7.76-7.82 (m, 4H); 12.91 (brs, 1H); MS (ESI+): m/z=452 [M+H]+;
Melting point: 281° C.
Prepared from 3-carboxybenzaldehyde, 2-amino-5-methyl-1,3,4-thiadiazole and 2-hydroxy-4-(4-methoxy-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 36% yield. 1H-NMR (DMSO-d6): δ (ppm) 2.59 (s, 3H); 3.81 (s, 3H); 6.24 (s, 1H); 6.98 (d, 2H); 7.35-7.39 (t, 1H); 7.72-7.77 (m, 4H); 7.95 (d, 1H); 12.98 (brs, 1H); MS (ESI+): m/z=452 [M+H]+; Melting point: 281° C.
Prepared from 4-cyanobenzaldehyde, 2-amino-5-methyl-1,3,4-thiadiazole and 2-hydroxy-4-(4-methoxy-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 10% yield. 1H-NMR (DMSO-d6): δ (ppm) 2.58 (s, 3H); 3.81 (s, 3H); 6.17 (s, 1H); 6.93 (d, 2H); 7.60 (d, 2H); 7.70 (d, 2H); 7.79 (d, 2H); MS (ESI+): m/z=433 [M+H]+; Melting point: 185° C.
Prepared from 4-hydroxybenzaldehyde, 2-amino-5-methyl-1,3,4-thiadiazole and 2-hydroxy-4-(4-methoxy-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 16% yield. 1H-NMR (DMSO-d6): δ (ppm) 2.59 (s, 3H); 3.82 (s, 3H); 6.06 (s, 1H); 6.58 (d, 2H); 6.96 (d, 2H); 7.17 (d, 2H); 7.76 (d, 2H); 9.36 (brs, 1H); MS (ESI+): m/z=424 [M+H]+; Melting point: 251° C.
Prepared from methyl-3-formylbenzoate, 2-amino-5-methyl-1,3,4-thiadiazole and 2-hydroxy-4-(4-methoxy-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 12% yield. Note: the solution was stirred 45 min at 160° C. in micro-waves apparatus. 1H-NMR (DMSO-d6): δ (ppm) 2.58 (s, 3H); 3.80 (s, 3H); 3.82 (s, 3H); 6.23 (s, 1H); 6.96 (d, 2H); 7.38-7.39 (t, 1H); 7.67-7.79 (m, 4H); 7.97 (brs, 1H); MS (ESI+): m/z=466 [M+H]+; Melting point: 218° C.
Prepared from 4-tert-butylbenzaldehyde, 2-amino-5-trifluoromethyl-1,3,4-thiadiazole and 2-hydroxy-4-(4-methoxy-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 7% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.19 (s, 9H); 3.83 (s, 3H); 6.22 (s, 1H); 7.00 (d, 2H); 7.29 (d, 2H); 7.43 (d, 2H); 7.79 (d, 2H); MS (ESI+): m/z=518 [M+H]+; Melting point: 271° C.
Prepared from 4-tert-butylbenzaldehyde, 2-amino-5-cyclohexyl-1,3,4-thiadiazole and 2-hydroxy-4-(4-methoxy-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 11% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.18 (s, 9H); 1.28-1.74 (m, 8H); 1.98-2.01 (m, 2H); 3.02 (m, 1H); 3.81 (s, 3H); 6.13 (s, 1H); 6.98 (d, 2H); 7.26 (d, 2H); 7.34 (d, 2H); 7.75 (d, 2H); MS (ESI+): m/z=532 [M+H]+
Prepared from 4-tert-butylbenzaldehyde, 2-amino-5-methyl-1,3,4-thiadiazole and 4-(4-dimethylcarbamoylmethoxy-phenyl)-2-hydroxy-4-oxo-but-2-enoic acid ethyl ester (intermediate 1) in 2% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.16 (s, 9H); 2.58 (s, 3H); 2.81 (s, 3H); 2.96 (s, 3H); 4.91 (s, 2H); 6.13 (s, 1H); 6.93 (d, 2H); 7.17-7.34 (m, 5H); 7.72 (d, 2H); MS (ESI+): m/z=535 [M+H]+
Prepared from 4-tert-butylbenzaldehyde, 2-amino-5-phenyl-1,3,4-thiadiazole and 2-hydroxy-4-(4-methoxy-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 34% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.17 (s, 9H); 3.81 (s, 3H); 6.21 (s, 1H); 6.98 (d, 2H); 7.28 (d, 2H); 7.40 (d, 2H); 7.50-7.52 (m, 3H); 7.76 (d, 2H); 7.90 (t, 2H); MS (ESI+): m/z=526 [M+H]+
Prepared from 4-tert-butylbenzaldehyde, 2-Amino-5-methyl-1,3,4-thiadiazole and 4-(4-carboxymethoxy-phenyl)-2-hydroxy-4-oxo-but-2-enoic acid ethyl ester (Intermediate 3) in 2% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.16 (s, 9H); 2.57 (s, 3H); 4.76 (s, 2H); 6.13 (s, 1H); 6.94 (d, 2H); 7.24 (d, 2H); 7.32 (d, 2H); 7.73 (dd, 2H); 12.1 (brs, 1H); 13.12 (brs, 1H); MS (ESI+): m/z=508 [M+H]+
Prepared from 4-tert-butylbenzaldehyde, 2-amino-5-methyl-1,3,4-thiadiazole and 2-hydroxy-4-[4-(2-hydroxy-ethoxy)-phenyl]-4-oxo-but-2-enoic acid ethyl ester (Intermediate 2) in 8% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.16 (s, 9H); 2.58 (s, 3H); 3.69 (t, 2H); 4.04 (t, 2H); 6.14 (s, 1H); 6.98 (d, 2H); 7.24 (d, 2H); 7.32 (d, 2H); 7.73 (d, 2H); MS (ESI+): m/z=494 [M+H]+
Prepared from 4-tert-butylbenzaldehyde, 5-isopropyl-[1,3,4]thiadiazol-2-ylamine and 2-hydroxy-4-(4-methoxy-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 27% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.18 (s, 9H); 1.30 (d, 6H); 3.32 (m, 1H); 3.82 (s, 3H); 6.15 (s, 1H); 6.99 (dd, 2H); 7.26 (dd, 2H); 7.36 (dd, 2H); 7.76 (d, 2H); MS (ESI+): m/z=492 [M+H]+; Melting point: 257° C.
Prepared from 4-phenyl-2-trimethylsilanyloxy-but-2-enoic acid ethyl ester (Journal of Organic Chemistry, 63, 18 (1998) p. 6409-13), 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 4-isopropylbenzaldehyde in 12% yield. Note: the reaction mixture was refluxed overnight. 1H-NMR (DMSO-d6): δ (ppm) 1.12 (d, 6H); 2.77-2.80 (m, 1H); 2.96 (d, 1H); 3.74 (d, 1H); 5.50 (s, 1H); 7.00-7.16 (m, 8H); 8.17-8.22 (m, 3H); 8.37 (d, 2H); 10.44 (s, 1H); MS (ESI+): m/z=576 [M+H]+
Prepared from 4-tert-butylbenzaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 4-(4-dimethylamino-phenyl)-2,4-dioxo-butyric acid methyl ester. MS (ESI+): m/z=647 [M+H]+
Prepared from 4-tert-butylbenzaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 2,4-dioxo-4-thiazol-2-yl-butyric acid methyl ester in 33% yield. MS (ESI+): m/z=611 [M+H]+
Prepared from 4-tert-butylbenzaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 2,4-dioxo-4-pyridin-4-yl-butyric acid methyl ester in 73% yield. MS (ESI+): m/z=605 [M+H]+
Prepared from 4-(trifluoromethyl)benzaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 4-furan-2-yl-2,4-dioxo-butyric acid methyl ester in 47% yield. MS (ESI+): m/z=606 [M+H]+
Prepared from 4-ethylbenzaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 4-furan-2-yl-2,4-dioxo-butyric acid methyl ester in 65% yield. MS (ESI+): m/z=566 [M+H]+
Prepared from 4-carboxybenzaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 4-furan-2-yl-2,4-dioxo-butyric acid methyl ester in 48% yield. Note: the solution was stirred at reflux overnight. MS (ESI+): m/z=582 [M+H]+
Prepared from 2-furaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 4-furan-2-yl-2,4-dioxo-butyric acid methyl ester. MS (ESI+): m/z=528 [M+H]+
Prepared from propionaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 4-furan-2-yl-2,4-dioxo-butyric acid methyl ester in 25% yield. MS (ESI+): m/z=490 [M+H]+
Prepared from 4-(trifluoromethoxy)benzaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 2-hydroxy-4-(4-isopropyl-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 11% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.18 (d, 6H); 2.93 (quint, 1H); 6.17 (s, 1H); 7.20 (d, 2H); 7.31 (d, 2H); 7.58 (d, 2H); 7.66 (d, 2H); 8.24 (s, 1H); 8.29 (d, 2H); 8.41 (d, 2H); MS (ESI+): m/z=674 [M+H]+; Melting point: 276-278° C.
Prepared from 4-(trifluoromethyl)benzaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 2-hydroxy-4-(4-isopropyl-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 11% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.18 (d, 6H); 2.92 (quint, 1H); 6.21 (s, 1H); 7.30 (d, 2H); 7.59 (d, 2H); 7.65-7.70 (m, 4H); 8.24-8.28 (m, 3H); 8.40 (d, 2H); MS (ESI+): m/z=658 [M+H]+; Melting point: 300-302° C.
Prepared, following Procedure A, from 4-(trifluoromethoxy)benzaldehyde, 544-nitro-phenylsulfanyl)-thiazol-2-ylamine and 2-hydroxy-4-(4-isopropyl-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 17% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.20 (d, 6H); 2.50 (s, 3H); 2.93 (quint, 1H); 6.24 (s, 1H); 7.26 (d, 2H); 7.35 (t, 4H); 7.62 (d, 2H); 7.69 (d, 2H); 7.85 (s, 1H); 8.17 (d, 2H); MS (ESI+): m/z=642 [M+H]+; Melting point: 238° C.
Prepared from cyclopropanecarboxaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 4-furan-2-yl-2,4-dioxo-butyric acid methyl ester. MS (ESI+): m/z=502 [M+H]+
Prepared from acetaldehyde, 2-amino-5-(4-nitrophenylsulfonyl)-thiazole and 4-furan-2-yl-2,4-dioxo-butyric acid methyl ester in 44% yield. MS (ESI+): m/z=502 [M+H]+
(R1, R2, X and Y are as defined above).
The aldehyde (1 eq) and the amine (1 eq) were dissolved in EtOH (2 ml/mmol)/AcOH cat. After stirring 30 min at room temperature, the keto-ester (1 eq) in EtOH (2 ml/mmol)/AcOH cat. was added. The reaction mixture was refluxed for 2 to 4 hours. After filtration of the mixture, the solid was washed with Et2O to give the desired compound. Sometimes, Et2O needs to be added in the reaction mixture to obtain a precipitate. When some starting amine was recovered, it could be removed by acidic washings. If the purity was insufficient, the residue was purified by flash chromatography (silica gel) or HPLC semi-preparative with the appropriate gradient determined by TLC.
The following compounds were prepared according general procedure B:
Prepared from 4-isopropylbenzaldehyde, 2-amino-thiazole-5-sulfonic acid dimethylamide and 2-hydroxy-4-oxo-4-p-tolyl-but-2-enoic acid ethyl ester in 22% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.10 (d, 6H); 2.35 (s, 3H); 2.68 (d, 6H); 2.78 (m, 1H); 6.16 (s, 1H); 7.13 (d, 2H); 7.30 (dd, 4H); 7.65 (d, 2H); 7.98 (s, 1H); MS (ESI+): m/z=526 [M+H]+; Melting point: 237-241° C.
Prepared from 4-isopropylbenzaldehyde, 5-(morpholine-4-sulfonyl)-thiazol-2-ylamine (Intermediate 4) and 2-hydroxy-4-oxo-4-p-tolyl-but-2-enoic acid ethyl ester in 20% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.10 (d, 6H); 2.35 (s, 3H); 2.79 (m, 1H); 2.90-2.95 (m, 4H); 3.65-3.8 (m, 4H); 6.16 (s, 1H); 7.13 (d, 2H); 7.27 (d, 2H); 7.34 (d, 2H); 7.64 (d, 2H); 7.98 (s, 1H); MS (ESI+): m/z=568 [M+H]+; Melting point: 247-252° C.
Prepared, following Procedure B, from 4-(trifluoromethoxy)benzaldehyde, 2-amino-5-methyl-1,3,4-thiadiazole and 2-hydroxy-4-(4-isopropyl-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 14% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.20 (d, 6H); 2.60 (s, 3H); 2.93 (quint, 1H); 6.20 (s, 1H); 7.24 (d, 2H); 7.33 (d, 2H); 7.60 (d, 2H); 7.69 (d, 2H); MS (ESI+): m/z=504 [M+H]+; Melting point: 260° C.
Prepared, following, Procedure B, from 4-(trifluoromethyl)benzaldehyde, 2-amino-5-methyl-1,3,4-thiadiazole and 2-hydroxy-4-(4-isopropyl-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 13% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.19 (d, 6H); 2.59 (s, 3H); 2.93 (quint; 1H); 6.25 (s, 1H); 7.31 (d, 2H); 7.61 (d, 2H); 7.66-7.71 (m, 4H); MS (ESI+): m/z=488 [M+H]+; Melting point: 257° C.
Prepared, following Procedure B, from 4-(trifluoromethyl)benzaldehyde, 2-amino-5-methylthiazole and 2-hydroxy-4-(4-isopropyl-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 15% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.20 (d, 6H); 2.33 (s, 3H); 2.93 (quint, 1H); 6.22 (s, 1H); 7.06 (s, 1H); 7.31 (d, 2H); 7.60-7.67 (m, 6H); MS (ESI+): m/z=487 [M+H]+
Prepared, following Procedure B, from 4-(trifluoromethoxy)benzaldehyde, 2-amino-5-methylthiazole and 2-hydroxy-4-(4-isopropyl-phenyl)-4-oxo-but-2-enoic acid ethyl ester in 28% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.19 (d, 6H); 2.32 (s, 3H); 2.92 (quint, 1H); 6.16 (s, 1H); 7.08 (s, 1H); 7.22 (d, 2H); 7.32 (d, 2H); 7.52 (d, 2H); 7.66 (d, 2H); MS (ESI+): m/z=503 [M+H]+; Melting point: 243-244° C.
(R1, R2, X and Y are as defined above).
To a stirred solution of alcohol in DMF (8 ml/mmol) at 0° C. was added portionwise NaH (1.5 eq). After stirring at 0° C. for 30 min, the iodomethane (1.5 eq) was added dropwise. The reaction mixture was stirred at room temperature overnight, then, diluted with water. The aqueous layer was extracted (3×) with ethyl acetate. The combined organic layers were washed with saturated sodium chloride, dried over anhydrous MgSO4, filtered and concentrated under vacuum. The residue was purified by flash chromatography (silica gel) with the appropriate gradient determined by TLC.
The following compounds were prepared according general procedure C:
Prepared from 3-hydroxy-5-(4-isopropyl-phenyl)-4-(4-methyl-benzoyl)-1-[5-(4-nitro-benzenesulfonyl)-thiazol-2-yl]-1,5-dihydro-pyrrol-2-one and iodomethane in 18% yield; 1H-NMR (CDCl3): δ (ppm) 1.12 (d, 6H); 2.39 (s, 3H); 2.77 (quint, 1H); 3.93 (s, 3H); 6.20 (s, 1H); 7.07 (dd, 4H); 7.22 (d, 2H); 7.57 (dd, 2H); 7.96 (s, 1H); 8.15 (d, 2H); 8.36 (d, 2H); MS (ESI+): m/z=618 [M+H]+; Melting point: 237° C.
Prepared from 5-(4-tert-butyl-phenyl)-3-hydroxy-4-(4-methoxy-benzoyl)-1-(5-methyl-[1,3,4]thiadiazol-2-yl)-1,5-dihydro-pyrrol-2-one and iodomethane in 25% yield. Note: after purification by flash chromatography (silica gel), the residue was triturated in Et2O then filtered. 1H-NMR (DMSO-d6): δ (ppm) 1.16 (s, 9H); 2.58 (s, 3H); 3.83 (s, 3H); 3.89 (s, 3H); 6.13 (s, 1H); 7.01 (d, 2H); 7.23 (s, 4H); 7.80 (d, 2H); MS (ESI+): m/z=478 [M+H]+; Melting point: 235-237° C.
(R1, R X and Y is as defined above)
To a stirred solution of carboxylic acid starting material (1 eq) in methylene chloride (21 ml/mmol) were added EDCI (1.1 eq or 1.5 eq) and DMAP (2.1 eq or 2.5 eq), followed by amine hydrochloride (1.1 eq or 1.5 eq). The reaction mixture was stirred at room temperature overnight. The mixture was washed with water, then, HCl 1N and saturated sodium chloride, dried over anhydrous MgSO4, filtered and concentrated under vacuum. The crude product was triturated with Et2O or Et2O/MeOH (0.5%) and filtered.
The following compounds were prepared according general procedure D:
Prepared from 4-{4-hydroxy-3-(4-methyl-benzoyl)-1-[5-(4-nitro-benzenesulfonyl)-thiazol-2-yl]-5-oxo-2,5-dihydro-1H-pyrrol-2-yl}-benzoic acid (Example 2) and dimethylamine hydrochloride in 75% yield. 1H-NMR (DMSO-d6): δ (ppm) 2.32 (s, 3H); 2.76-2.88 (m, 6H); 6.13 (s, 1H); 7.21-7.24 (D, 4H); 7.43 (d, 2H); 6.62 (d, 2H); 8.22-8.26 (m, 3H); 8.39 (d, 2H); MS (ESI+): m/z=633 [M+H]+; Melting point: 205° C.
Prepared from 4-{4-hydroxy-3-(4-methyl-benzoyl)-1-[5-(4-nitro-benzenesulfonyl)-thiazol-2-yl]-5-oxo-2,5-dihydro-1H-pyrrol-2-yl}-benzoic acid (Example 2) and methylamine hydrochloride in 57% yield. 1H-NMR (DMSO-d6): δ (ppm) 2.33 (s, 3H); 2.68 (d, 3H); 6.15 (s, 1H); 7.23 (dd, 2H); 7.48 (dd, 2H); 7.61-7.65 (m, 4H); 8.23-8.27 (m, 3H); 8.40 (dd, 2H); MS (ESI+): m/z=619 [M+H]+; Melting point: 195-197° C.
Prepared from 4-[4-hydroxy-3-(4-methoxy-benzoyl)-1-(5-methyl-[1,3,4]thiadiazol-2-yl)-5-oxo-2,5-dihydro-1H-pyrrol-2-yl]-benzoic acid (Example 21) and dimethylamine hydrochloride in 80% yield. 1H-NMR (DMSO-d6): δ (ppm) 2.59 (s, 3H); 2.78 (s, 3H); 2.90 (s, 3H); 3.82 (s, 3H); 6.20 (s, 1H); 6.97 (d, 2H); 7.27 (d, 2H); 7.45 (d, 2H); 7.75 (d, 2H); MS (ESI+): m/z=479 [M+H]+
Prepared from 3-[4-hydroxy-3-(4-methoxy-benzoyl)-1-(5-methyl-[1,3,4]thiadiazol-2-yl)-5-oxo-2,5-dihydro-1H-pyrrol-2-yl]-benzoic acid (Example 22) and methylamine hydrochloride in 41% yield. 1H-NMR (DMSO-d6): δ (ppm) 2.57 (s, 3H); 2.72 (d, 3H); 3.79 (s, 3H); 6.18 (s, 1H); 6.96 (dd, 2H); 7.32 (t, 1H); 7.56-7.84 (m, 5H); 8.46 (brd, 1H); MS (ESI+): m/z=465 [M+H]+; Melting point: 238° C.
Prepared from 3-[4-hydroxy-3-(4-methoxy-benzoyl)-1-(5-methyl-[1,3,4]thiadiazol-2-yl)-5-oxo-2,5-dihydro-M-pyrrol-2-yl]-benzoic acid (Example 22) and dimethylamine hydrochloride in 58% yield. 1H-NMR (DMSO-d6): δ (ppm) 2.59 (s, 3H); 2.70 (s, 3H); 2.93 (s, 3H); 3.81 (s, 3H); 6.19 (s, 1H); 6.97 (d, 2H); 7.18-7.34 (m, 2H); 7.47-7.50 (m, 2H); 7.77 (d, 2H); MS (ESI+): m/z=479 [M+H]+
R1, R, R2 X and Y is as defined above)
To a solution of the starting material in pyridine (10 ml/mmol) was added oxime (1:1 by mass). The solution was stirred for 2 h or 4 h at 100° C. in micro-waves apparatus. The mixture was concentrated under vacuum. The crude product was diluted with water and extracted twice with ethyl acetate. The organic layers were combined, dried on anhydrous MgSO4, filtered and concentrated in vacuum. The residue was purified by flash chromatography (silica gel) and it was triturated with Et2O/MeOH (0.5%).
The following compounds were prepared according general procedure E.
Prepared from 3-hydroxy-5-(4-isopropyl-phenyl)-4-(4-methyl-benzoyl)-1-[5-(4-nitro-benzenesulfonyl)-thiazol-2-yl]-1,5-dihydro-pyrrol-2-one and methylhydroxyl amine hydrochloride as E/Z mixture in 26% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.10 (d, 6H); 2.40 (s, 3H); 2.71-2.77 (m, 1H); 3.50 (s, 3H); 5.61 (s, 1H); 6.46 (d, 2H); 6.92 (d, 2H); 7.07 (d, 2H); 7.26 (d, 2H); 8.20-8.24 (m, 3H); 8.38 (d, 2H); MS (ESI+): m/z=633 [M+H]+; Melting point: 156° C.
Prepared from 3-hydroxy-5-(4-isopropyl-phenyl)-4-(4-methyl-benzoyl)-1-[5-(4-nitro-benzenesulfonyl)-thiazol-2-yl]-1,5-dihydro-pyrrol-2-one and hydroxylamine hydrochloride as E/Z mixture in 35% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.16 (d, 6H); 2.35 (s, 3H); 2.86 (m, 1H); 4.37 (d, 1H); 5.37 (d, 1H); 7.20 (d, 2H); 7.27-7.32 (m, 4H); 7.40 (d, 2H); 8.19-8.25 (m, 3H); 8.37 (d, 2H); 9.13 (s, 1H); MS (ESI+): m/z=619 [M+H]+; Melting point: 210-213° C.
To a solution of 2-(4-acetyl-phenoxy)-N,N-dimethyl-acetamide 4.52 mmol (1 eq) in dry toluene (10 ml) and under an atmosphere of nitrogen was added portionwise sodium hydride 9.04 mmol (2 eq). The mixture was heated at 45° C. and the diethyl oxalate 6.78 mmol (1.5 eq) in dry toluene (10 ml) was added dropwise. The mixture was refluxed for 10 min, then, concentrated under vacuum to give the crude product, which was purified by flash chromatography on silica gel. The product was dissolved in diethyl ether and washed with HCl 1N, the layers were separated and the organic layers were combined, dried on anhydrous MgSO4, filtered and concentrated in vacuum to give the keto-ester. 1H-NMR (DMSO-d6): δ (ppm) 1.26 (t, 3H); 2.83 (s, 3H); 2.98 (s, 3H); 4.29 (q, 2H); 4.98 (s, 2H); 7.03 (s, 1H); 7.08 (dd, 2H); 8.04 (dd, 2H); MS (ESI+): m/z=322 [M+H]+
(R1 is as defined above)
To a solution of EtONa (prepared in situ with Na (1.3 eq) and ethanol (4 ml/mmol)) was added the starting material (1 eq) at 0° C. The mixture was stirred 10 min, then, diethyl oxalate (1.3 eq) was added dropwise. The mixture was refluxed overnight, then, concentrated under vacuum to give the crude product, which was diluted in ethyl acetate and was washed with HCl 1N then water and brine. The organic layers were combined, dried on anhydrous MgSO4, filtered and concentrated in vacuum to give the keto-ester which, depending on the purity could be purified by flash chromatography on silica gel. The following intermediates were prepared according general procedure F:
Prepared from 1-[4-(2-hydroxy-ethoxy)-phenyl]-ethanone and diethyl oxalate in 35% yield. 1H-NMR (DMSO-d6): δ (ppm) 1.29 (t, 3H); 3.72 (t, 2H); 4.08 (t, 2H); 4.28 (q, 2H); 7.0-7.11 (m, 3H); 8.05 (dd, 2H); MS (ESI+): m/z=281 [M+H]
Prepared from (4-acetyl-phenoxy)-acetic acid and diethyl oxalate. The product was used as such in the next step. 1H-NMR (DMSO-d6): δ (ppm) 1.29 (t, 3H); 4.26 (q, 2H); 4.78 (s, 2H); 6.98-7.08 (m, 3H); 7.91 (dd, 2H); 13.17 (brs, 1H); MS (ESI+): m/z=295 [M+H]
To a solution of 0.68 mmol (1 eq) of N-[5-(morpholine-4-sulfonyl)-thiazol-2-yl]-acetamide in ethanol (10 ml) was added dropwise HCl conc. (0.8 ml).
The mixture was refluxed for 2 h30, then, concentrated under vacuum and NH4OH 25% and water were added. The mixture was extracted with ethyl acetate, then, the layers were separated, organic layers were combined, dried on anhydrous MgSO4, filtered and concentrated in vacuum to give the amine in 78% yield. 1H-NMR (DMSO-d6): δ (ppm) 2.90 (t, 4H); 3.65 (t, 4H); 7.46 (s, 1H); 7.97 (brs, 2H)
The compounds according to the present invention were tested for their anti Hepatitis C activity as follow:
Human Hepatoma Huh-7 cell line was maintained in DMEM/HAMF-12 supplemented with 10% SVF, 4 mM glutamine, 0.5M Na pyruvate, 1% penistreptomycine. HCV replicon containing Huh-7 cell lines Huh-9.13 and Luc Neo ET (Reblikon) were maintained in DMEM supplemented with 10% SVF, 2 mM glutamine, and 1×NEAA, 100 U/ml penicillin, and 100 μg/ml streptomycine. Replicon cells were maintained in medium supplemented with 1 mg/ml G418 for replicon Huh-9.13 and 0.5 mg/ml for Luc Neo et replicon unless indicated otherwise. Huh-7 and HCV replicon cell lines were maintained at 37° C. and 5% CO2 in a humidified atmosphere. Cells were dissociated at sub confluence with trypsin EDTA 1×.
cDNA encoding HCV NS5B genotype 1b, was cloned in frame with Gal4-DNA Binding Domain. The protein was expressed with a 21 amino acid C-terminal deletion to remove transmembrane domain. Expression of NS5BΔ21/Gal4 DBD fusion protein was under control of SV40 early promoter. 3D-Sensor peptide was cloned in frame with VP16 activation domain. Expression of 3D-Sensor/VP16 AD fusion protein was under control of CMV promoter. Expression of the firefly luciferase reporter gene was inducible by the [Target protein/conformation sensitive peptide/VP16AD] complex.
3D-SCREEN assay is a reporter gene assay designed to identify chemical entities that modify the 3D-structure of target proteins and hence inhibit their biological activity (WO2006/046134). It is a single-target, cell based assay. Briefly, expression of a reporter gene depends on the interaction of a short peptide, thereafter named 3D-Sensor, and native conformation of the target protein. Whenever the conformation of the target protein is modified, interaction between 3D-sensor and target protein is disrupted and reporter gene is not expressed anymore. Conformation modifiers are identified by loss of expression of reporter gene. NS5B 3D-Screen platform was generated in Huh-7 cell lines by transient transfection of three expression vectors encoding respectively
Huh-7 cells were dissociated the day before transfection and seeded in T175 flasks at a density of 107 cells in 30 ml culture medium. Equimolar ratios of vectors were transfected in cell according to optimized jetPEI transfection protocol (PolyPlus Transfection, Illkirch, France) and 10 μg total DNA/106 cells. Transfection was performed for 2 hours at 37° C. and 5% CO2 in a humidified atmosphere. After two hours cells were dissociated and seeded in 96 wells plates at a density of 25,000 cells per well and 90 μl culture medium. 10 μl of compounds to be tested were added 2 hours after seeding. Final concentration of DMSO was 1%. Cells were incubated in the presence of compounds for 24 hours after which expression of firefly luciferase reporter gene was quantified. Briefly, culture medium was removed and cells were lysed by addition of 100 μl of lysis buffer containing 125 mM Tris Phosphate ph 7.8, 10 mM EDTA, 5 mM DTT, 50% glycerol and 5% Triton. Plates were vortexed 10 min at 1300 rpm. Cell lysat was transferred in OpaqueWhite Assay 96 well Flat Bottom plates. 100 μl of luciferin solution 1× were added to each well. Luciferin solution contained 40 mM Tris Phosphate ph 7.8, 0.2 mM EDTA, 67 mM DTT, 2.14 mM MgCl2, 5.4 mM MgSO4, 4.7×10−4 M luciferin, 5.3×10−4 M ATP and 2.7×10−4 M Acetyl co enzyme A. Luminescence was immediately measured with Berthold Microlumat Plus LB 96V luminometer with an integration of 0.5 sec. Inhibition was calculated using the formula: % inhibition=(1−(read/average max))*100. Average max=signal in absence of compound
Replicon Luc Neo ET is a bicistronic expression constructs (Lohmann et al, 1999, Science 285, 110-113). In brief, the structural genes of the HCV genome were replaced by heterologous sequences; the gene encoding the neomycin phosphotransferase (NPT) and the internal ribosome entry site (IRES) of the encephalomyocarditis virus (EMCV). The bicistronic construct is therefore composed of the following elements: HCV-IRES nucleotides 1-389, the NPT gene, the EMCV-IRES directing translation of downstream HCV sequences from NS2 or NS3 up to the authentic 3′ end of the genome. HCV Polyprotein harbours the cell culture adaptive mutations E1202G, T1280I, K1846T. G418-resistance is only possible with cells containing high amounts of replicon.
Cells were dissociated the day before addition of compounds and seeded in 96 well-plates at a final concentration of 77 777.77 cells·ml−1·well−2 in 90 μl final volume of culture medium per well and were maintained at 37° C. and 5% CO2 in a humidified atmosphere for 24 hours. 10 μl of compounds to be tested were added 24 hours after seeding. Final concentration of DMSO was 1%. Cells were incubated in the presence of compounds for 72 hours after which expression of firefly luciferase reporter gene was quantified. Briefly, culture medium was removed and cells were lysed by addition of 100 μl of lysis buffer containing 125 mM Tris Phosphate ph 7.8, 10 mM EDTA, 5 mM DTT, 50% glycerol and 5% Triton. Plates were vortexed 10 min at 1300 rpm. Cell lysat was transferred in OpaqueWhite Assay 96 well Flat Bottom plates. 100 μl of luciferin solution 1× were added to each well. Luciferin solution contained 40 mM Tris Phosphate ph 7.8, 0.2 mM EDTA, 67 mM DTT, 2.14 mM MgCl2, 5.4 mM MgSO4, 4.7×10−4 M luciferin, 5.3×10−4 M ATP and 2.7×10−4 M Acetyl co enzyme A. Luminescence was immediately measured with Berthold Microlumat Plus LB 96V luminometer with an integration of 0.5 sec Inhibition was calculated using the formula:
% inhibition=1−[(RLUsample−RLUbackground)/(RLUsignal−RLUbackground)]
The assay was performed in a total volume of 20 μl containing 20 mM Tris pH 7.5, 1 mM DTT, 17 U RNasin, 50 mM NaCl, 10% DMSO, 5 mM MgCl2, 0.5 mM each of the 3 NTPs (ATP, CTP, GTP), 86 nM RNA template (341 nt from the 3′ end of HCV minus strand RNA), 50 nM of purified HCV NS5B with a deletion of the 21 C-terminal amino acids and 2 μCi [3H]UTP (46 Ci·mmol−1). The reaction mixture was incubated for 2 h at 25-30° C. and the radio labeled products were precipitated by the addition of 10% TCA. The radioactivity incorporated was quantified by counting in a Wallac scintillation counter. Increasing concentrations of tested compounds were added to the complete RdRp reaction mixture. After a two hour incubation period at 25-30° C., the amount of labeled product was determined as above. Two types of control reactions were done: a negative control corresponding to the complete mixture without enzyme and a positive control with enzyme but without compounds. In each experiment, test and control samples are in duplicate.
The level of activity with each compound concentration was expressed with the formulae:
The IC50 value was calculated as the compound concentration reducing polymerase activity by 50%.
The results are indicated in the following tables:
| Number | Date | Country | Kind |
|---|---|---|---|
| 09305670.3 | Jul 2009 | EP | regional |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2010/059921 | 7/9/2010 | WO | 00 | 3/30/2012 |
