Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
  • C07D239/70—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings condensed with carbocyclic rings or ring systems
  • C07D239/72—Quinazolines; Hydrogenated quinazolines
  • C07D239/86—Quinazolines; Hydrogenated quinazolines with hetero atoms directly attached in position 4
  • C07D239/94—Nitrogen atoms
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
  • A61K31/505—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim
  • A61K31/517—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim ortho- or peri-condensed with carbocyclic ring systems, e.g. quinazoline, perimidine
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
  • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
  • C07D401/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links

Definitions

• the present invention relates to an improved method for preparing l-(4- (4-(3,4-dichloro-2-fluorophenylamino)-7-methoxyquinazolin-6-yloxy)piperidin- l-yl)-prop-2-en-l-one hydrochloride, which selectively and effectively inhibits the growth of cancer cells induced by over-expression of an epidermal growth factor receptor and prevents the development of drug resistance caused by mutation of a tyrosine kinase, and intermediates used therein.
• the compound of formula (II) may be prepared by, e.g., the method disclosed in Korean Patent No. 1013319, the reaction mechanism thereof being shown in Reaction Scheme 1 below.
• the compound of formula (II) prepared according to Reaction Scheme 1 may then be reacted with hydrochloric acid to produce the compound of formula (I).
• Reaction Scheme 1 a compound of formula 10 is subjected to a condensation reaction with formamidine hydrochloride at a high temperature (e.g., 210 °C) to produce a compound of formula 9, which is then subjected to a reaction with L-methionine in an organic acid (e.g., methanesulfonic acid), whereby the methyl group at the position of C-6 of the compound of formula 9 is removed to produce a compound of formula 8.
• a condensation reaction with formamidine hydrochloride at a high temperature (e.g., 210 °C) to produce a compound of formula 9, which is then subjected to a reaction with L-methionine in an organic acid (e.g., methanesulfonic acid), whereby the methyl group at the position of C-6 of the compound of formula 9 is removed to produce a compound of formula 8.
• organic acid e.g., methanesulfonic acid
• the compound of formula 8 is subjected to a protection reaction in a base (e.g., pyridine) and anhydrous acetic acid to produce a compound of formula 7, which is then subjected to a reaction with an inorganic acid (e.g., thionylchloride or phosphorous oxychloride) in the presence of a catalytic amount of NN-dimethylformamide under a reflux condition to produce a compound of formula 6 in hydrochlorate form.
• a base e.g., pyridine
• anhydrous acetic acid e.g., a base
• an inorganic acid e.g., thionylchloride or phosphorous oxychloride
• the compound of formula 6 is added under stirring to an ammonia- containing alcohol solution (e.g., a 7 ⁇ ammonia-containing methanol solution), whereby the acetyl group is removed to produce a compound of formula 5.
• the compound of formula 5 is subjected to the Mitsunobu reaction with tert-butyl 4- hydroxypiperidin-l-carboxylate to produce a compound of formula 4, which is then subjected to a substitution reaction with aniline in an organic solvent (e.g., 2- propanol or acetonitrile) to produce a compound of formula 3.
• an organic solvent e.g., 2- propanol or acetonitrile
• Diisopropyl azodicarboxylate, diethyl azodicarboxylate or di-t-butyl azodicarboxylate, and triphenylphosphine may be employed for the Mitsunobu reaction.
• the compound of formula 3 is subjected to a reaction with an organic or inorganic acid (e.g., trifluoroacetic acid or heavy hydrochloric acid) in an organic solvent (e.g., dichloromethane), whereby the t-butoxycarbonyl group is removed to produce a compound of formula 2.
• an organic or inorganic acid e.g., trifluoroacetic acid or heavy hydrochloric acid
• organic solvent e.g., dichloromethane
• the compound of formula 2 is subjected to an acylation reaction with acryloyl chloride in a mixture of an organic solvent (e.g., tetrahydrofuran) and water, or in dichloromethane, in the presence of an inorganic or organic base (e.g., sodium bicarbonate, pyridine or triethylamine).
• an organic solvent e.g., tetrahydrofuran
• dichloromethane e.g., sodium bicarbonate, pyridine or triethylamine
• the compound of formula 2 is subjected to a condensation reaction with acrylic acid in the presence of a coupling agent (e.g., l-ethyl-3-(3-dimethylaminopropyl)-carbodiimide (EDC) or 2-(lH-7- azabenzotriazol- 1 -yl)- 1,1,3 ,3-tetramethyl europium hexafluorophosphate methanaminium (HATU)).
• a coupling agent e.g., l-ethyl-3-(3-dimethylaminopropyl)-carbodiimide (EDC) or 2-(lH-7- azabenzotriazol- 1 -yl)- 1,1,3 ,3-tetramethyl europium hexafluorophosphate methanaminium (HATU)
• the step for preparing the compound of formula 9 is hazardous since it is conducted at a high temperature without a solvent, and the reaction may not proceed uniformly. Further, an excessive amount of thionyl choloride is used in the step for preparing the compound of formula 5, giving rise to difficulties in the subsequent steps. Hence, this method is not feasible for commercialization.
• the main drawbacks of the above method for preparing the compound of formula (I) reside in that the yield of the final product in the acrylic reaction is very low (i.e., 13%) and that the reaction is accompanied by a number of side reactions, which requires a purification step by column chromatography. Also, when the compound of formula 3 is prepared by the Mitsunobu reaction, various by-products would be formed, which necessitates a purification step by column chromatography. Since expensive silica gel and an excessive amount of mobile phase solvents are required in such case, the above method is not feasible for commercialization.
• the present inventors have endeavored to develop a novel method for preparing the compound of formula (I) in high purity and yield, the method being economical and suitable for commercialization.
• the present method may be the carried out as shown in Reaction Schemes 2 to 6 below. Steps (1) and (2) of the present method can be carried out in accordance with Reaction Scheme 2:
• Step (1) the compound of formula (VIII) as a starting material is subjected to a reaction with a halogenating agent in a solvent such as toluene or benzene in the presence of an organic base, followed by a reaction with the compound of formula (X), to produce 4-(3,4-dichloro-2-fluorophenylamino)-7- methoxyquinazolin-6-yl acetate of formula (VI).
• the compound of formula (VIII) can be prepared by the method disclosed in Korean Patent No. 1013319.
• the organic base used in Step (1) of the present method may be selected from the group consisting of diisopropylamine, triethylamine, diisopropyl ethylamine, diethylamine, pyridine, 4-dimethylpyridine, morpholine and a mixture thereof; and the halogenating agent may be selected from the group consisting of thionyl chloride, phosphorusoxy chloride and a mixture thereof.
• the reaction may be conducted at a temperature of 50°C to 150°C, preferably 60°C to 90°C, more preferably about 75°C.
• the compound of formula (VII) may be prepared as contained in the organic solvent, which cannot readily be separated.
• the compound of formula (VII) contained in the organic solvent is subjected to a reaction with the compound of formula (X) to produce 4-(3,4- dichloro-2-fluorophenylamino)-7-methoxyquinazolin-6-yl acetate of formula (VI).
• Step (2) the compound of formula (VI) prepared in Step (1) is subjected to a reaction with an ammonia solution or ammonia gas in a polar protic solvent (e.g., methanol, ethanol and propanol) at a temperature of 0°C to 40°C, preferably 10°C to 30°C, more preferably about 25°C, to produce 4-(3,4- dichloro-2-fluorophenylamino)-7-methoxyquinazolin-6-ol of formula (V).
• a polar protic solvent e.g., methanol, ethanol and propanol
• the inert polar protic solvent used in Step (3) of the present method may be selected from the group consisting of N,N-dimethylformamide, N,N- dimethylacetamide, N-methylpyrrolidin-2-one, dimethyl sulfoxide and a mixture thereof.
• the base may be an alkali metal carbonate salt selected from the group consisting of sodium hydrogen carbonate, potassium carbonate, cesium carbonate and a mixture thereof.
• the base is used in an amount of 1 to 5 mole equivalents based on 1 mole equivalent of the compound of formula (V).
• the reaction may be conducted at a temperature of 60°C to 100°C, preferably 70°C to 90°C, more preferably about 80°C.
• the compound of formula (IV) can be prepared in high purity and yield by simple recrystallization by K 2 CO 3 in Step (3) of the present method.
• the conventional method disclosed in Korean Patent No. 1013319 it is required to employ expensive diisopropyl azodicarboxylate (DIAD) as a main reagent and purify the product by column chromatography.
• DIAD diisopropyl azodicarboxylate
• the conventional method is not only uneconomical, but it is also ineffective as compared to the present method in terms of yield and purity ⁇ See Table 1).
• Step (4) as depicted in Reaction Scheme 4, the compound of formula (IV) is subjected to a reaction with hydrochloric acid in an inert solvent to produce N-(3,4-dichloro-2-fluorophenyl)-7-methoxy-6-(piperidin-4- yloxy)quinazolin-4-amine dihydrochloride of formula (III).
• the inert solvent used in Step (4) of the present method may be selected from the group consisting of methanol, ethanol, propanol, ethyl acetate, methyl acetate, acetone and a mixture thereof.
• Hydrochloric acid may be used in an amount of 3 to 10 mole equivalents based on 1 mole equivalent of the compound of formula (IV).
• the reaction may be conducted under stirring for 1 to 24 hours at a temperature of 0°C to 60°C, preferably 10°C to 40°C, more preferably about 25°C.
• (III) is subjected to an acrylation reaction with (wherein X is halogen), e.g., acryloyl chloride in the presence of a base to produce l-(4-(4-(3,4-dichloro- 2-fluoropheny lamino)-7-methoxyquinazolin-6-y loxy)piperidin- 1 -y l)prop-2-en- 1 - one of formula (II).
• X is halogen
• acryloyl chloride in the presence of a base to produce l-(4-(4-(3,4-dichloro- 2-fluoropheny lamino)-7-methoxyquinazolin-6-y loxy)piperidin- 1 -y l)prop-2-en- 1 - one of formula (II).
• Step (5) of the present method can be conducted in an organic solvent such as tetrahydrofuran, ethyl acetate, acetone, 1 ,4-dioxane, acetonitrile, dichloromethane, carbon tetrachloride, chloroform, NN-dimethyl formamide or dimethylsulfoxide, or in a mixture of said organic solvent and water.
• an organic solvent such as tetrahydrofuran, ethyl acetate, acetone, 1 ,4-dioxane, acetonitrile, dichloromethane, carbon tetrachloride, chloroform, NN-dimethyl formamide or dimethylsulfoxide, or in a mixture of said organic solvent and water.
• Preferred is a mixture of an organic solvent selected from the group consisting of tetrahydrofuran, ethyl acetate, acetone, 1,4-dioxane and aceton
• the base employed in Step (5) may be selected from the group consisting of an inorganic base such as sodium carbonate, calcium carbonate, potassium carbonate, sodium hydroxide, potassium hydroxide or cesium carbonate, or an organic base such as diisopropylamine, triethylamine, diisopropylethylamine or diethylamine.
• the base may be used in an amount of 3 to 5 mole equivalents based on 1 mole equivalent of the compound of formula (III).
• the acrylic reaction may be conducted under stirring for 20 minutes to 3 hours at a temperature of -30°C to 20°C, preferably about 0°C.
• the resulting mixture is subjected to recrystallization with an aqueous acetone in an amount of 15 to 30 (w/v) times based on the amount of the compound of formula (III).
• the compound of formula (II) can be prepared in high purity and yield by simple recrystallization in Step (5) of the present method. Meanwhile, according to the conventional method disclosed in Korean Patent No. 1013319, it requires purification of the product by column chromatography. Hence, the conventional method is ineffective as compared to the present method in terms of yield and purity (See Table 2).
• Step (6) as demonstrated in Reaction Scheme 6, the compound of formula (II) is subjected to a reaction with hydrochloric acid in an organic solvent to produce 1 -(4-(4-(3 ,4-dichloro-2-fluoropheny lamino)-7-methoxyquinazolin-6- y loxy )piperidin- 1 -y l)prop-2-en- 1 -one hydrochloride of formula (I) .
• the organic solvent used in Step (6) of the present method may be selected from the group consisting of methanol, ethanol, propanol, isopropanol, butanol, ethyl acetate, acetone, tetrahydrofuran, acetonitrile, 1,4-dioxane and a mixture thereof.
• the reaction may be conducted at a temperature of 0°C to 60°C, preferably 10°C to 40°C, more preferably about 25°C.
• These compounds can be used in preparing l-(4-(4-(3,4- dichloro-2-fluorophenylamino)-7-methoxyquinazolin-6-yloxy)piperidin-l- yl)prop-2-en l-one hydrochloride of formula (I), which selectively and effectively inhibits the growth of cancer cells induced by over-expression of an epidermal growth factor receptor and prevents the development of drug resistance caused by mutation of a tyrosine kinase.
• the compounds of formulae (I) and (II) can be prepared in high yield by a simple and low cost method.
• the compound of formula (VIII) can simply be converted to the compound of formula (VI) in situ, and the compound of formula (V) can be produced without any special purification step.
• the conventional method for preparing the compounds of formulae (II), (III) and (IV) necessitates an additional purification or extraction step by, e.g., column chromatography, which makes it less feasible for commercialization.
• the present method makes it possible to produce the final product in high purity and yield by adding a solvent to the reaction mixture to produce the product in solid phase and recrystallizing and filtering the product.
• the following Examples are intended to further illustrate the present invention without limiting its scope.
• the solid was dissolved in a mixed solvent (600 ml) of dichloromethane and methanol. Active carbon (6 g) was then added thereto, followed by stirring for 30 minutes. The resulting mixture was filtered through a Celite pad, distilled under a reduced pressure, added with acetone (300 ml), and stirred for 2 hours. The resulting solid was filtered and washed with acetone (100 ml). The solid was dried at 40°C in an oven to produce the compound of formula (IV) (75 g, yield: 83%).
• Acetone (740 ml) was added to ter/-butyl 4-(4-(3,4-dichloro-2- fluorophenylamino)-7-methoxyquinazolin-6-yloxy)piperidin-l-carboxylate (75 g), which was then stirred. The mixture was added with hydrochloric acid (145 ml) for 10 minutes and stirred for 5 hours. Upon completion of the reaction, the resulting mixture was filtered, and the solid thus obtained was washed with acetone (73 ml). The solid was dried at 30°C in an oven to produce the compound of formula (III) (71 g, yield: 99%).
• N-(3,4-dichloro-2-fluorophenyl)-7-methoxy-6-(piperidin-4- yloxy)quinazolin-4-amine dihydrochloride 100 g
• sodium hydrogen carbonate 66 g
• tetrahydrofuran 6 ml
• water 1 L
• Acryloyol chloride 24 ml
• tetrahydrofuran 370 ml

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