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Deuterated n-ethyl-n-phenyl-1,2-dihydro-4-hydroxy-5-chloro-1-methyl-2-oxoquinoline-3-carboxamide, salts and uses thereof

a technology of n-ethyl n-phenyl and n-phenyl methyl, which is applied in the field of deuterated nethylnphenyl1, 2dihydro4hydroxy5chloro1methyl2oxoquinoline3carboxamide, salts, etc., and can solve problems such as not divulging metabolic profiles

Inactive Publication Date: 2014-02-20
TEVA PHARMA IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, WO 2010 / 028015 cautions that, “[m]etabolic switching can lead to different proportions of known metabolites as well as altogether new metabolites” and such “new metabolic profile may impart more or less toxicity” which “are not predictable a priori for any drug class”.
Thus, WO 2010 / 028015 does not provide at least the dosage for administration of the deuterium-enriched variants of laquinimod, and does not disclose the metabolic profile.

Method used

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  • Deuterated n-ethyl-n-phenyl-1,2-dihydro-4-hydroxy-5-chloro-1-methyl-2-oxoquinoline-3-carboxamide, salts and uses thereof
  • Deuterated n-ethyl-n-phenyl-1,2-dihydro-4-hydroxy-5-chloro-1-methyl-2-oxoquinoline-3-carboxamide, salts and uses thereof
  • Deuterated n-ethyl-n-phenyl-1,2-dihydro-4-hydroxy-5-chloro-1-methyl-2-oxoquinoline-3-carboxamide, salts and uses thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Deuterated Laquinimod

Step 1: Synthesis of Deuterated N-Ethyl-aniline

[0113]

[0114]Aniline (0.01 mole) was dissolved in toluene (10 ml), cooled to 0° C. under nitrogen, and acetic anhydride (0.02 mole) was added in one portion. The cooling bath was removed and the mixture was stirred for 90 minutes and then evaporated on a rotary evaporator. The intermediate acetanilide was dried in vacuum and then dissolved in THF (20 ml) and cooled to 0° C. under nitrogen. Lithium aluminium hydride (0.025 mole) was added during 25 minutes. The mixture was refluxed for 2 hours and then cooled. Silica gel (3 gr) was added followed by addition of 1M NaOH solution (1.8 gr). The mixture was stirred for 30 minutes and then filtered through a pad of sodium sulphate. The filter cake was washed with diethyl ether and the organic phase was concentrated on a rotary evaporator to give the title compounds.

Step 2: Synthesis of Deuterated Laquinimod

N-ethyl-N-D5-phenyl-1,2-dihydro-4-hydroxy-5-chloro-1...

example 2

Analysis of DELAQ

[0120]DELAQ is formed as a metabolite in rodents as well as in human body upon administration of laquinimod. Several analytical and bioanalytical methods were developed for determination of DELAQ concentrations, as a representative metabolite. The current bioanalytical methods for DELAQ analysis in various matrices are based on LC-MS and have sensitivity at the low pg / mL plasma level.

[0121]The following conditions were used in the determination of DELAQ in human plasma. The plasma is purified by on-line SPE after precipitation with LUDOX AS-40 colloidal silica solution followed by the analysis with HPLC with MS / MS detection.

Condition 1:ApparatusLC / MS / MS SCIEX, QTRAP4000Shimadzu Prominence HPLCSystem Controller: Shimadzu CBM-20APumps:Pump A: Shimadzu LC-20ADPump B: Shimadzu LC-20ADPump C: Shimadzu LC-20ABAutosampler: Shimadzu SIL-20ACColumn Oven: Shimadzu CTO-20ACData Acquisition SystemAnalyst 1.4.2 or higher versionColumn for analysis withWaters Symmetry Shield RP18...

example 3

Pharmacokinetic and Partial Metabolic Evaluation

[0123]The main objectives of this example were:[0124]Quantification of Compound 1, Compound 2, Compound 3 and Laquinimod in rat plasma using LC / MS / MS bioanalytical method.[0125]Characterization of the pharmacokinetic profile of Compound 1, Compound 2, Compound 3 and Laquinimod following oral (P0) administration at a dose of 0.2 mg / kg.[0126]The measurement DELAQ concentrations in the collected plasma samples.

[0127]The dose level selected in this example has been used in a pharmacological study previously conducted with laquinimod.

General Design

[0128]Rats cannulated at the right common jugular vein by polyethylene tubing were used. In the in-life part, three cannulated female rats were treated with each of the four test articles at dose of 0.2 mg / kg.

[0129]Blood was withdrawn from the rats at five different time points for the preparation of plasma. The concentrations of Compound 1, Compound 2, Compound 3, laquinimod, and DELAQ were deter...

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Abstract

The subject invention provides deuterated N-ethyl-N-phenyl-1,2-dihydro-4-hydroxy-5-chloro-1-methyl-2-oxoquinoline-3-carboxamide, its salts and uses.

Description

[0001]This application claims benefit of U.S. Provisional Application No. 61 / 399,297, filed Jul. 9, 2010, the contents of which are hereby incorporated by reference.[0002]Throughout this application various publications, published patent applications, and patents are referenced. The disclosures of these documents in their entireties are hereby incorporated by reference into this application in order to more fully describe the state of the art to which this invention pertains.BACKGROUND OF THE INVENTION[0003]Laquinimod is a compound which has been shown to be effective in the acute experimental autoimmune encephalomyelitis (aEAE) model (U.S. Pat. No. 6,077,851). Its chemical name is N-ethyl-N-phenyl-1,2-dihydro-4-hydroxy-5-chloro-1-methyl-2-oxoquinoline-3-carboxamide, and its Chemical Registry number is 248281-84-7. The processes of synthesis of laquinimod and the preparation of its sodium salt are disclosed in U.S. Pat. No. 6,077,851. An additional process of synthesis of laquinimod...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07D215/56A61K31/4704
CPCA61K31/4704C07D215/56A61K31/47A61K2300/00A61P1/04A61P13/12A61P19/02A61P25/00A61P25/28A61P29/00A61P37/00A61P37/02A61P37/06A61K31/5545A61K9/20A61K9/2013A61K31/00A61K31/33A61K31/395A61K31/435A61K31/455A61K31/465
Inventor PIRYATINSKY, VICTORLAXER, AVITAL
Owner TEVA PHARMA IND LTD
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