Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
  • C07D403/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings
  • C07D403/04—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings directly linked by a ring-member-to-ring-member bond
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C309/00—Sulfonic acids; Halides, esters, or anhydrides thereof
  • C07C309/01—Sulfonic acids
  • C07C309/02—Sulfonic acids having sulfo groups bound to acyclic carbon atoms
  • C07C309/03—Sulfonic acids having sulfo groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton
  • C07C309/04—Sulfonic acids having sulfo groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton containing only one sulfo group
• • 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
  • A61K31/506—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim not condensed and containing further heterocyclic rings
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents

Definitions

• This specification relates an improved process for the manufacture of osimertinib.
• Osimertinib (AZD9291) is a third generation EGFR Tyrosine Kinase Inhibitor (TKI). Osimertinib is disclosed in WO 2013/014448, the contents of which are incorporated by reference. Osimertinib has the following chemical structure:
• Osimertinib mesylate is an approved treatment for non-small cell lung cancer (NSCLC), and is also known as TAGRISSOTM.
• WO 2013/014448 discloses the following synthesis of osimertinib.
• WO 2013/014448 discloses the use of p-toluenesulfonic acid and 2-pentanol at 85 °C for 3 hours for this step.
• CN109134435 discloses acetonitrile (MeCN) as an alternative solvent for this step, with the reaction heated to 85 °C for 12 hours.
• WO 2013/014448 discloses that the compound of Formula (I) was then converted to a compound of Formula (IV) by reaction with a compound of Formula (V) (N,N',N'- trimethyl-ethane-l,2-diamine) (Step B herein) in the presence of /V,/V-diisopropylethylamine (DIPEA) and 2,2,2-trifluoroethanol at 140°C for 1 h.
• DIPEA /V,/V-diisopropylethylamine
• This new telescoped process avoided the need to isolate the compound of Formula (I), improving the overall economy of the manufacture of EGFR TKIs, such as osimertinib.
• one drawback of this process was that a high relative volume of acetonitrile (MeCN) was required.
• the first reaction to form a compound of Formula (I) required 25 relative volumes of acetonitrile, with a further 10 relative volumes of acetonitrile added for the second reaction to form a compound of Formula (IV).
• the reaction mixture was diluted with a further 15 relative volumes of acetonitrile and purified by a hot filtration to remove inorganics, washing with a further 2 relative volumes of acetonitrile. As such, a total of 52 relative volumes of acetonitrile was required. If less acetonitrile was used, it was observed that the compound of Formula (IV) crystallised prior to the hot filtration. This uncontrolled crystallisation of the compound of Formula (IV) was detrimental to the purity of the isolated material. Furthermore, this uncontrolled crystallisation made it more difficult to isolate the compound of Formula (IV) from any inorganic solid present at the end of the reaction by filtration. There is therefore a need for a further improved process for the synthesis of the compound of Formula (IV), as part of the manufacture of EGFR TKIs, such as osimertinib.
• a process for the production of a compound of Formula (I): or a salt thereof comprising a reaction of a compound of Formula (II): or a salt thereof, and a compound of Formula (III): or a salt thereof, wherein the reaction is performed in the presence of an acid and benzonitrile, wherein R 1 is C1-3 alkyl or cyclopropyl.
• Step A and Step B reduces the environmental impact and improves the overall cost of goods for the manufacture of EGFR TKIs, such as osimertinib. Furthermore, by using benzonitrile as solvent it is possible to telescope this sequence using fewer relative volumes of solvent compared to acetonitrile. This is because when benzonitrile was used, the compound of Formula (IV) remained in solution at significantly higher concentrations that was possible using acetonitrile.
• the reaction of the compound of Formula (I), or a salt thereof, and a compound of Formula (V), or a salt thereof is performed in the presence of DBU.
• molar equivalents refers to molar equivalents with respect to the compound of Formula (II), or a salt thereof.
• relative volume means the volume of solvent in litres required relative to the charge of the compound of Formula (II), or a salt thereof, in kilograms.
• MsOH refers to methanesulfonic acid
• MeCN refers to acetonitrile
• C-3 alkyl refers to both straight and branched chain saturated hydrocarbon radicals having 1, 2 or 3 carbon atoms.
• Examples of C1-3 alkyl are methyl, ethyl, n-propyl and i-propyl.
• the term "telescope” refers to the process of performing two reactions sequentially without the isolation of the product of the first reaction.
• square brackets are used to indicate that a material is not isolated before being subjected to the next reaction in the sequence.
• this specification provides a process for the production of a compound of Formula (I): or a salt thereof, comprising a reaction of a compound of Formula (II): or a salt thereof, and a compound of Formula (III): or a salt thereof, wherein the reaction is performed in the presence of an acid and benzonitrile wherein R 1 is C1-3 alkyl or cyclopropyl.
• R 1 is methyl
• the free base of the compound of Formula (I) is known by the chemical name N- (4-fluoro-2-methoxy-5-nitrophenyl)-4-(l-methyl-lH-indol-3-yl)-2-pyrimidinamine.
• the compound of Formula (I) is /V-(4-fluoro-2-methoxy-5-nitrophenyl)-4-(l-methyl-lH-indol-3-yl)-2- pyrimidinamine.
• R 1 is methyl
• the free base of the compound of Formula (II) is known by the chemical name 3- (2-chloro-4-pyrimidinyl)-l-methyl-lH-indole (AZD9291 Chloropyrimidine).
• the compound of Formula (II) is 3-(2-chloro-4-pyrimidinyl)-l-methyl-lH-indole.
• the compound of Formula (II) may also be known by the name 3-(2-chloropyrimidin-4-yl)-l-methyl-lH-indole.
• the free base of the compound of Formula (III) is known by the chemical name 4-fluoro-2-methoxy- 5-nitroaniline (AZD9291 Nitroaniline).
• the compound of Formula (III) is 4-fluoro-2- methoxy-5-nitroaniline.
• Suitable acids are Bronsted acids, for example, carboxylic acids, sulfonic acids and mineral acids.
• the acid is selected from a sulfonic acid, a carboxylic acid, and a mineral acid.
• the acid is a sulfonic acid.
• the sulfonic acid is selected from methanesulfonic acid, benzenesulfonic acid and p-toluenesulfonic acid.
• the acid is methanesulfonic acid.
• the acid is a carboxylic acid.
• the carboxylic acid is selected from (Ci.yhydrocarbyljCOOH, formic acid, trichloroacetic acid and trifluoroacetic acid.
• An example of a (CshydrocarbylJ-COOH is n-butanoic acid.
• An example of a (CghydrocarbyljCOOH is benzoic acid.
• the carboxylic acid is selected from acetic acid and trifluoroacetic acid.
• the acid is a mineral acid.
• the mineral acid is selected from hydrochloric acid, sulfuric acid and phosphoric acid.
• At least 0.02 molar equivalents of acid is used. In further embodiments, 0.02-1 molar equivalents of acid is used. In further embodiments, 0.02-0.30 molar equivalents of acid is used. In further embodiments, 0.04 to 0.30 molar equivalents of acid is used. In further embodiments, 0.02 to 0.15 molar equivalents of acid is used. In further embodiments, 0.04 to 0.15 molar equivalents of acid is used. In further embodiments, 0.06 to 0.15 molar equivalents of acid is used. In further embodiments, 0.04 to 0.12 molar equivalents of acid is used. In further embodiments, 0.06 to 0.12 molar equivalents of acid is used.
• 0.1 molar equivalents of acid is used. In further embodiments, 0.1 molar equivalents of acid is used. In further embodiments, about 0.075 molar equivalents of acid is used. In further embodiments, 0.075 molar equivalents of acid is used. It is to be understood that the amount (molar equivalents) of acid is relative to the amount of the compound of Formula (II), or a salt thereof.
• the reaction of a compound of Formula (II), or a salt thereof, and a compound of Formula (III), or a salt thereof is performed at a temperature of at least 60 °C. In further embodiments, the reaction of a compound of Formula (II), or a salt thereof, and a compound of Formula (III), or a salt thereof, is performed at a temperature in the range 60 to 130 °C. In further embodiments, the reaction is performed at a temperature in the range 80 to 130 °C. In further embodiments, the reaction is performed at a temperature in the range 60 to 120 °C. In further embodiments, the reaction is performed at a temperature in the range 80 to 120 °C.
• the reaction is performed at a temperature in the range 90 to 110 °C. In further embodiments, the reaction is performed at a temperature in the range 100 to 110 °C. In further embodiments, the reaction is performed at a temperature of about 100 °C. In further embodiments, the reaction is performed at a temperature of 100 °C. In further embodiments, the reaction is performed at a temperature of about 105 °C. In further embodiments, the reaction is performed at a temperature of 105 °C.
• the reaction of a compound of Formula (II), or a salt thereof, and a compound of Formula (III), or a salt thereof is performed at a temperature in the range 60 to 130 °C for up to 24 hours. In further embodiments, the reaction is performed at a temperature in the range 80 to 120 °C for 3 to 5 hours. In further embodiments, the reaction is performed at a temperature in the range 90 to 110 °C for 3 to 5 hours.
• the reaction of a compound of Formula (II), or a salt thereof, and a compound of Formula (III), or a salt thereof is performed with at least 4 relative volumes of benzonitrile. In further embodiments, the reaction is performed with 4 to 10 relative volumes of benzonitrile. In further embodiments, the reaction is performed with 4 to 6 relative volumes of benzonitrile. In further embodiments, the reaction is performed with about 5 relative volumes of benzonitrile. In further embodiments, the reaction is performed with 5 relative volumes of benzonitrile.
• the reaction of a compound of Formula (II), or a salt thereof, and a compound of Formula (III), or a salt thereof is performed with at least 1 L of benzonitrile/Mole of the compound of Formula (II), or a salt thereof.
• the reaction is performed with 1 to 2.5 L of benzonitrile/Mole of the compound of Formula (II), or a salt thereof.
• the reaction is performed with 1 to 1.5 L of benzonitrile/Mole of the compound of Formula (II), or a salt thereof.
• the reaction is performed with about 1.2 L of benzonitrile/Mole of the compound of Formula (II), or a salt thereof.
• the reaction is performed with 1.2 L of benzonitrile/Mole of the compound of Formula (II), or a salt thereof.
• reaction of a compound of Formula (II), or a salt thereof, and a compound of Formula (III), or a salt thereof is performed with at least 50 mMoles of the compound of Formula (II), or a salt thereof. In further embodiments, the reaction is performed with at least 80 mMoles of the compound of Formula (II), or a salt thereof.
• the reaction of a compound of Formula (II), or a salt thereof, and a compound of Formula (III), or a salt thereof is performed with at least 1.0 molar equivalents of the compound of Formula (III), or a salt thereof.
• the reaction is performed with 1.0-1.5 molar equivalents of the compound of Formula (III), or a salt thereof.
• the reaction is performed with 1.0-1.3 molar equivalents of the compound of Formula (III), or a salt thereof.
• the reaction is performed with at 1.0-1.2 molar equivalents of the compound of Formula (III), or a salt thereof.
• the reaction is performed with 1.05-1.2 molar equivalents of the compound of Formula (III), or a salt thereof. In further embodiments, the reaction is performed with 1.05-1.15 molar equivalents of the compound of Formula (III), or a salt thereof. In further embodiments, the reaction is performed with about 1.1 molar equivalents of the compound of Formula (III), or a salt thereof. In further embodiments, the reaction is performed with 1.1 molar equivalents of the compound of Formula (III), or a salt thereof. It is to be understood that the amount (molar equivalents) of compound of Formula (III), or a salt thereof, is relative to the amount of the compound of Formula (II), or a salt thereof.
• step (i) is as described in any of the aforementioned embodiments.
• R 1 is methyl
• the free base of the compound of Formula (IV) is known by the chemical name /V-[2-(dimethylamino)ethyl]-5-methoxy-/V-methyl-/ ⁇ /'-[4-(l-methyl-lH-indol-3-yl)-2-pyrimidinyl]-2- nitro-l,4-benzenediamine (AZD9291 Nitrodiamine).
• the compound of Formula (IV) is /V-[2-(dimethylamino)ethyl]-5-methoxy-/V-methyl-/ ⁇ /'-[4-(l-methyl-lH-indol-3-yl)-2-pyrimidinyl]-2- nitro-l,4-benzenediamine.
• R 1 is methyl
• the compound of Formula (IV) may also be known by the name N 1 -(2-(dimethylamino)ethyl)-5-methoxy-N 1 -methyl-N 4 -(4-(l-methyl-lH-indol-3- yl)pyrimidin-2-yl)-2-nitrobenzene-l,4-diamine.
• the free base of the compound of Formula (V) is known by the chemical name N,N,N'- trimethylethylenediamine (TriMEDA).
• TriMEDA N,N,N'- trimethylethylenediamine
• the compound of Formula (V) is N,N,N'- trimethylethylenediamine.
• the compound of Formula (V) may also be known by the name N ⁇ N ⁇ N 2 - trimethylethane-l,2-diamine.
• the reaction of the compound of Formula (I), or a salt thereof, and a compound of Formula (V), or a salt thereof is performed in the presence of a base.
• Suitable bases are Bronsted bases, for example, an organic base or an inorganic base.
• the base is an amidine base or a guanidine base.
• the base is l,8-diazabicyclo(5.4.0)undec-7-ene (DBU), 1,1,3,3-tetramethylguanidine (TMG), l,5-diazabicyclo[4.3.0]non-5-ene (DBN), 7-methyl-l,5,7-triazabicyclo(4.4.0)dec-5-ene (MTBD) or triazabicyclodecene (TBD).
• DBU 1,1,3,3-tetramethylguanidine
• TBN 1,1,3,3-tetramethylguanidine
• DBN 1,1,3,3-tetramethylguanidine
• DBN 1,1,3,3-tetramethylguanidine
• DBN 1,1,3,3-tetramethylguanidine
• DBN 1,1,3,3-tetramethylguanidine
• DBN 1,1,3,3-tetramethylguanidine
• DBN 1,1,3,3-tetramethylguanidine
• DBN 1,1,3,3-tetramethyl
• the base is selected from potassium carbonate (K2CO3), potassium hydrogen carbonate (KHCO3), sodium carbonate (NajCOs), sodium hydrogen carbonate (NaHCOs), sodium hydroxide (NaOH), potassium hydroxide (KOH), lithium hydroxide (LiOH), caesium hydroxide (CsOH), calcium hydroxide (Ca OH ), calcium carbonate (CaCOs), barium hydroxide (Ba OH ) and caesium carbonate (CS2CO3).
• the reaction of the compound of Formula (I), or a salt thereof, and a compound of Formula (V), or a salt thereof is performed with at least 2 molar equivalents of the base. In further embodiments, the reaction is performed with at least 2.2 molar equivalents of the base. In further embodiments, the reaction is performed with 2.0 to 2.5 molar equivalents of the base. In further embodiments, the reaction is performed with 2.0 to 2.4 molar equivalents of the base. In further embodiments, the reaction is performed with 2.2 to 2.5 molar equivalents of the base. In further embodiments, the reaction is performed with 2.2 to 2.4 molar equivalents of the base. In further embodiments, the reaction is performed with about 2.3 molar equivalents of the base.
• the reaction is performed with 2.3 molar equivalents of the base. It is to be understood that the amount (molar equivalents) of base is relative to the amount of the compound of Formula (II), or a salt thereof.
• the reaction of the compound of Formula (I), or a salt thereof, and a compound of Formula (V), or a salt thereof is performed in the presence of a fluoride scavenger.
• the fluoride scavenger is a calcium salt.
• the fluoride scavenger is selected from calcium hydroxide (CafOH ), calcium carbonate (CaCOs), calcium propionate (CafCjHsCOO ), calcium acetate ((Ca(OAc)z), calcium citrate, calcium gluconate and calcium chloride (CaCL).
• the reaction of the compound of Formula (I), or a salt thereof, and a compound of Formula (V), or a salt thereof is performed with at least 2 molar equivalents of the fluoride scavenger. In further embodiments, the reaction is performed with at least 2.2 molar equivalents of the fluoride scavenger. In further embodiments, the reaction is performed with 2.0 to 2.5 molar equivalents of the fluoride scavenger. In further embodiments, the reaction is performed with 2.0 to 2.4 molar equivalents of the fluoride scavenger. In further embodiments, the reaction is performed with 2.2 to 2.5 molar equivalents of the fluoride scavenger.
• the reaction is performed with 2.2 to 2.4 molar equivalents of the fluoride scavenger. In further embodiments, the reaction is performed with about 2.3 molar equivalents of the fluoride scavenger. In further embodiments, the reaction is performed with 2.3 molar equivalents of the fluoride scavenger. It is to be understood that the amount (molar equivalents) of fluoride scavenger is relative to the amount of the compound of Formula (II), or a salt thereof.
• the reaction of the compound of Formula (I), or a salt thereof, and a compound of Formula (V), or a salt thereof is performed with at least 1 molar equivalent of the compound of Formula (V), or a salt thereof.
• the reaction is performed with at least 1.3 molar equivalents of the compound of Formula (V), or a salt thereof.
• the reaction is performed with 1.3 to 3 molar equivalents of the compound of Formula (V), or a salt thereof.
• the reaction is performed with 1.5 to 2.5 molar equivalents of the compound of Formula (V), or a salt thereof.
• the reaction is performed with 1.5 to 2.2 molar equivalents of the compound of Formula (V), or a salt thereof.
• the reaction is performed with 1.8 to 2.5 molar equivalents of the compound of Formula (V), or a salt thereof. In embodiment, the reaction is performed with 1.8 to 2.2 molar equivalents of the compound of Formula (V), or a salt thereof In embodiment, the reaction is performed with about 2 molar equivalents of the compound of Formula (V), or a salt thereof. In embodiment, the reaction is performed with 2 molar equivalents of the compound of Formula (V), or a salt thereof. It is to be understood that the amount (molar equivalents) of compound of Formula (V), or a salt thereof, is relative to the amount of the compound of Formula (II), or a salt thereof.
• the reaction of the compound of Formula (I), or a salt thereof, and a compound of Formula (V), or a salt thereof is performed at a temperature of at least 40 °C, such as at least 60 °C. In further embodiments, the reaction is performed at a temperature in the range 40 to 100 °C. In further embodiments, the reaction is performed at a temperature in the range 60 to 100 °C. In further embodiments, the reaction is performed at a temperature in the range 60 to 90 °C. In further embodiments, the reaction is performed at a temperature in the range 70 to 100 °C. In further embodiments, the reaction is performed at a temperature in the range 70 to 90 °C.
• the reaction is performed at a temperature in the range 70 to 85 °C. In further embodiments, the reaction is performed at a temperature of about 70 °C. In further embodiments, the reaction is performed at a temperature of about 70 °C. In further embodiments, the reaction is performed at a temperature of about 80 °C. In further embodiments, the reaction is performed at a temperature of about 80 °C.
• step (i) and step (ii) are performed sequentially without the isolation of the compound of Formula (I), or a salt thereof, from the benzonitrile of step (i). In further embodiments, step (ii) is performed without the addition of further benzonitrile.
• step (i) and step (ii) are telescoped.
• Example 1 Telescoped Synthesis of /V-[2-(dimethylamino)ethyl]-5-methoxy-/V-methyl-/V'-[4-(l- methyl-lH-indol-3-yl)-2-pyrimidinyl]-2-nitro-l,4-benzenediamine (AZD9291 Nitrodiamine)
• the reaction mixture was then charged with l,8-diazabicyclo[5.4.0]undec-7-ene (DBU, 37.8 g, 37.1 ml, 2.30 mol eq.), maintaining the temperature below 45°C.
• the reaction mixture was then charged with /V,/V,/V rimethylethylenediamine (TriMEDA, 21.0 g, 26.3 mL, 2.0 mol eq.), maintaining the temperature below 45 °C.
• TriMEDA 21.0 g, 26.3 mL, 2.0 mol eq.
• the reaction mixture was then heated to 80 °C for 1 hour, and then cooled to 70 °C and charged with AZD9291 Nitrodiamine seed.
• AZD9291 Nitrodiamine may be dissolved in a minimum of benzonitrile at 70 °C, then cooled to 5 °C at a rate of 0.1 °C/min over 11 hours.
• This description and its specific examples, while indicating embodiments of this specification, are intended for purposes of illustration only. This specification, therefore, is not limited to the illustrative embodiments described in this specification, and may be variously modified.

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