Classifications

• • 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
  • A61K31/535—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with at least one nitrogen and one oxygen as the ring hetero atoms, e.g. 1,2-oxazines
  • A61K31/5375—1,4-Oxazines, e.g. morpholine
  • A61K31/5377—1,4-Oxazines, e.g. morpholine not condensed and containing further heterocyclic rings, e.g. timolol
• • 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
  • A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
  • A61K31/44—Non condensed pyridines; Hydrogenated derivatives thereof
  • A61K31/445—Non condensed piperidines, e.g. piperocaine
  • A61K31/4523—Non condensed piperidines, e.g. piperocaine containing further heterocyclic ring systems
  • A61K31/454—Non condensed piperidines, e.g. piperocaine containing further heterocyclic ring systems containing a five-membered ring with nitrogen as a ring hetero atom, e.g. pimozide, domperidone
• • 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
  • 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
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K45/00—Medicinal preparations containing active ingredients not provided for in groups A61K31/00 - A61K41/00
  • A61K45/06—Mixtures of active ingredients without chemical characterisation, e.g. antiphlogistics and cardiaca
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
  • A61K47/06—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
  • A61K47/08—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing oxygen, e.g. ethers, acetals, ketones, quinones, aldehydes, peroxides
  • A61K47/10—Alcohols; Phenols; Salts thereof, e.g. glycerol; Polyethylene glycols [PEG]; Poloxamers; PEG/POE alkyl ethers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/0012—Galenical forms characterised by the site of application
  • A61K9/0053—Mouth and digestive tract, i.e. intraoral and peroral administration
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2300/00—Mixtures or combinations of active ingredients, wherein at least one active ingredient is fully defined in groups A61K31/00 - A61K41/00

Definitions

• Case P37529 Combination of allosteric and orthosteric EGFR inhibitors for the treatment of cancer
• the present invention relates to a novel combination of an orthosteric EGFR inhibitor with a selective allosteric EGFR inhibitor of T790M/L858R, T790M/L858R/C797S, L858R, L858R/C797S containing EGFR mutants, as well as uses and pharmaceutical compositions thereof.
• the present invention provides in particular a combination of an allosteric EGFR inhibitor and an orthosteric EGFR inhibitor, wherein the allosteric EGFR inhibitor is a compound of formula (I) wherein L is a bond or alkynylene; R 1 is hydrogen or halogen; R 2 and R 2’ are independently selected from hydrogen and alkyl; or R 2 and R 2’ , together with the carbon atom to which they are attached, form cycloalkyl; R 3 is hydrogen, halogen or haloalkyl; R 4 is alkyl or halogen; R 5 is (heterocycloalkyl)alkylene or heterocycloalkyl, wherein (heterocycloalkyl)alkylene is optionally substituted with one or two substituents independently selected from R 6 , and wherein heterocycloalkyl is optionally substituted with one or two substituents independe ⁇ ntly selected from R 7 ; R 6 is at each instance independently selected from alkyl, cycloalky
• the HER family receptor tyrosine kinases are mediators of cell growth, differentiation and survival.
• the receptor family includes four distinct members, i.e. epidermal growth factor receptor (EGFR, ErbBl, or HER1) HER2 (ErbB2), HER3 (ErbB3) and HER4 (ErbB4).
• EGFR epidermal growth factor receptor
• ErbBl epidermal growth factor receptor
• HER3 HER3
• HER4 HER4
• C797S mutation was further reported by Wang to be a major mechanism for resistance to T790M-targeting EGFR inhibitors (Wang et al. EGFR C797S mutation mediates resistance to third-generation inhibitors in T790M-positive non-small cell lung cancer, J Hematol Oncol.2016; 9: 59).
• the rational being that once drug-resistance occurred the treatment could be switched from an orthosteric EGFR inhibitor to an allosteric EGFR inhibitor that was specifically designed for targeting mutants bearing T790M and/or C797S mutations.
• the present invention relates to a combination of an orthosteric EGFR inhibitor with a selective allosteric EGFR inhibitor that corresponds to the compound of formula (I).
• the compound of formula (I) efficiently targets T790M/L858R, T790M/L858R/C797S, L858R, L858R/C797S mutations and has low hepatic clearance in vitro (Tables 1 and 2).
• the compound of formula (I) also efficiently targets the L858R/C797S mutation in vivo in a Ba/F3 based allograft ( Figure 1), a mutation that causes resistance to orthosteric EGFR inhibitors.
• Figure 1 a mutation that causes resistance to orthosteric EGFR inhibitors.
• the combined treatment with a clinically relevant dose of the approved orthosteric EGFR inhibitor osimertinib and an allosteric EGFR inhibitor of formula (I) drastically improved tumour regression in mice with NCI-H1975 xenograft, which is an established model of EGFR- driven NSCLC harboring the EGFR L858R/T790M double mutation ( Figure 2).
• an EGFR inhibitor of formula (I) increases the residence time of the orthosteric EGFR inhibitor osimertinib around 120 fold, and thus accelerates the rate with which osimertinib covalently bonds to EGFR ( Figure 3).
• This surprising positive cooperativity between an allosteric EGFR inhibitor of formula (I) and an orthosteric EGFR inhibitor has not been previously reported and offers promising new therapeutic strategies for patients with EGFR-related cancer, in particular non-small cell lung cancer.
• Figure 1 Anti-tumor activity of compound Example 6 (square) and compound Example 3 (triangle) in an Ba/F3 EGFR L858R/C797S allograft at 10 mpk and 30 mpk, respectively, BID po. Black arrows indicate dosings.
• a tumor control ratio (TCR) below 1.0 indicated tumor growth inhibition, with confidence interval (CI) reflecting the data distribution.
• An upper CI below 1.0 confirms statistical significance. No significant changes in body weight occurred for the different cohorts.
• FIG. 2 (A) Anti-tumor activity of compound Example 6 alone and in combination with osimertinib in NCI-H1975 NSCLC-derived tumors (EGFR L858R/T790M xenograft) in mice. Black arrow indicates dosings. A TCR below 1.0 indicated tumor growth inhibition, with CI reflecting the data distribution. An upper CI below 1.0 confirms statistical significance. No significant changes in body weight occurred for the different cohorts. (B) Anti-tumor activity of compound Example 1 alone and in combination with osimertinib in NCI-H1975 NSCLC-derived tumors (EGFR L858R/T790M xenograft) in mice. Black arrow indicates dosings.
• FIG. 1 A TCR below 1.0 indicated tumor growth inhibition, with CI reflecting the data distribution. An upper CI below 1.0 confirms statistical significance.
• Figure 3 (A) Binding kinetics measured by stopped-flow fluorescence. Osimertinib quenches the TRp-fluorescence of EGFR when bound. (B) Binding kinetics directly show that osimertinib reacts faster with the EGFR kinase domain (L858R) in presence of the allosteric inhibitor compound Example 1, indicating positive cooperativity.
• inhibitor denotes a compound which competes with, reduces or prevents the binding of a particular ligand to particular receptor, or which reduces or prevents the function of a particular protein.
• an inhibitor as used therein refers to compounds which target, decrease or inhibit EGFR activity, particular inhibitors have an IC50 value below 1 ⁇ M, below 500 nM, below 200 nM, below 100 nM, below 50 nM, below 25 nM, below 10 nM, below 5 nM, 2 nM or below 1 nM.
• the term “EGFR inhibitor” refers to compounds that decrease EGFR kinase activity at least about 10%, at least about 20%, at least about 30%, at least about 40%, at least about 50%, at least about 60%, at least about 70%, at least about 75%, at least about 80%, at least about 85%, at least about 90%, at least about 95% or at least about 99%.
• the term “orthosteric EGFR inhibitor” relates to an EGFR inhibitor that binds close to the active site, such as for instance erlotinib , geftinib, osimertinib, almonertinib, lazertinib and furmonertinib, or a pharmaceutically acceptable salt thereof, in particular a mesylate salt.
• Non- limiting examples of orthosteric EGFR inhibitors include cetuximab (Erbitux®), panitumumab (Vectibix®), osimertinib (merelectinib, Tagrisso®), erlotinib (Tarceva®), gefitinib (lressa®), necitumumab (PortrazzaTM), neratinib (Nerlynx®), lapatinib (Tykerb®), vandetanib (Caprelsa®) and brigatinib (Alunbrig®).
• IC50 refers to the concentration of a particular compound required to inhibit 50% of a specific measured activity.
• alkyl signifies a straight-chain or branched-chain alkyl group with 1 to 8 carbon atoms, particularly a straight or branched-chain alkyl group with 1 to 6 carbon atoms and more particularly a straight or branched-chain alkyl group with 1 to 4 carbon atoms.
• Examples of straight-chain and branched-chain C1-C8 alkyl groups are methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert.-butyl, sec.-butyl, the isomeric pentyls, the isomeric hexyls, the isomeric heptyls and the isomeric octyls, particularly methyl, ethyl, propyl, butyl and pentyl.
• Particular examples of “alkyl” are methyl, ethyl, propyl, isopropyl, and tert.- butyl.
• Methyl is a particular example of “alkyl” in the compound of formula (I).
• alkoxy or “alkyloxy”, alone or in combination, signifies a group of the formula alkyl-O- in which the term "alkyl” has the previously given significance, such as methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy and tert-butoxy.
• Particular examples of “alkoxy” are methoxy, ethoxy and tert-butoxy.
• alkylene denotes a linear saturated divalent hydrocarbon group of 1 to 7 carbon atoms or a divalent branched saturated divalent hydrocarbon group of 3 to 7 carbon atoms.
• alkylene groups include methylene, ethylene, propylene, 2-methylpropylene, butylene, 2-ethylbutylene, pentylene, hexylene.
• a particular example of “alkylene” is methylene.
• alkynylene alone or in combination, denotes a linear divalent hydrocarbon chain of 2-6 carbon atoms or a branched divalent hydrocarbon chain of 3-6 carbon atoms with at least one triple bond.
• alkynylene examples include ethynylene, 2,2-dimethylethynylene, propynylene, 2-methylpropynylene, butynylene, and pentynylene.
• alkynylene is ethynylene.
• halogen or “halo”, alone or in combination, signifies fluorine, chlorine, bromine or iodine and particularly fluorine or chlorine.
• a particular “halogen” or “halo” is fluorine.
• halo in combination with another group, denotes the substitution of said group with at least one halogen, particularly substituted with one to five halogens, particularly one to four halogens, i.e. one, two, three or four halogens.
• haloalkyl alone or in combination, denotes an alkyl group substituted with at least one halogen, particularly substituted with one to five halogens, particularly one to three halogens.
• Particular examples of “haloalkyl” are difluoromethyl and trifluoromethyl.
• hydroxyl and “hydroxy”, alone or in combination signify the -OH group.
• carbonyl alone or in combination, signifies the -C(O)- group.
• heterocycloalkyl denotes a monovalent saturated or partly unsaturated mono- or bicyclic ring system of 4 to 9 ring atoms, comprising 1, 2, or 3 ring heteroatoms selected from N, O and S, the remaining ring atoms being carbon. Bicyclic means consisting of two cycles having one or two ring atoms in common.
• heterocycloalkyl are morpholinyl, piperidinyl, azetidinyl and piperazinyl, Particular examples of “heterocycloalkyl” are piperidinyl and morpholinyl.
• cycloalkyl denotes a monovalent saturated cyclic hydrocarbon group of 3 to 8 ring carbon atoms.
• examples of “cycloalkyl” are cyclopropyl, cyclobutanyl, cyclopentyl, cyclohexyl or cycloheptyl.
• a particular example of the “cycloalkyl” group is cyclopropyl.
• the terms “piperidinyl” and “piperidyl” are interchangeable and signify, alone or in combination, a saturated monocycle comprising 5 carbon ring atoms and one nitrogen ring atom.
• salts refers to those salts which retain the biological effectiveness and properties of the free bases or free acids, which are not biologically or otherwise undesirable.
• the salts are formed with inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid and the like, in particular hydrochloric acid, and organic acids such as acetic acid, propionic acid, glycolic acid, pyruvic acid, oxalic acid, maleic acid, malonic acid, succinic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, cinnamic acid, mandelic acid, methanesulfonic acid, ethanesulfonic acid, p- toluenesulfonic acid, salicylic acid, N-acetylcystein and the like.
• salts may be prepared by addition of an inorganic base or an organic base to the free acid.
• Salts derived from an inorganic base include, but are not limited to, the sodium, potassium, lithium, ammonium, calcium, magnesium salts and the like.
• Salts derived from organic bases include, but are not limited to salts of primary, secondary, and tertiary amines, substituted amines including naturally occurring substituted amines, cyclic amines and basic ion exchange resins, such as isopropylamine, trimethylamine, diethylamine, triethylamine, tripropylamine, ethanolamine, lysine, arginine, N-ethylpiperidine, piperidine, polyimine resins and the like.
• Particular pharmaceutically acceptable salts of compound of formula (I) are the hydrochloride salts, methanesulfonic acid salts and citric acid salts.
• Particular pharmaceutically acceptable salts of osimertinib are methanesulfonic acid salts, also referred to as mesylate salts.
• the invention provides a kit comprising an orthosteric EGFR inhibitor and an allosteric EGFR inhibitors of formula (I) as described therein, prescribing information also known as “leaflet”, a blister package or bottle (HDPE or glass) and a container.
• the prescribing information preferably includes the advice to a patient regarding the administration of the combination of the orthosteric EGFR inhibitor and allosteric EGFR inhibitor treatment as described herein;
• the asymmetric carbon atom can be of the "R" or "S" configuration.
• the compound of formula (I) can contain several asymmetric centers and can be present in the form of optically pure enantiomers, mixtures of enantiomers such as, for example, racemates, optically pure diastereoisomers, mixtures of diastereoisomers, diastereoisomeric racemates or mixtures of diastereoisomeric racemates. Furthermore, the invention includes all substituents in its corresponding deuterated form, wherever applicable, of the compound of formula (I).
• optically pure enantiomer means that the compound contains > 90 % of the desired isomer by weight, particularly > 95 % of the desired isomer by weight, or more particularly > 99 % of the desired isomer by weight, said weight percent based upon the total weight of the isomer(s) of the compound.
• Chirally pure or chirally enriched compound may be prepared by chirally selective synthesis or by separation of enantiomers. The separation of enantiomers may be carried out on the final product or alternatively on a suitable intermediate.
• the compound of formula (I) and its pharmaceutically acceptable salts can be used as medicaments (e.g. in the form of pharmaceutical preparations).
• the pharmaceutical preparations can be administered internally, such as orally (e.g. in the form of tablets, coated tablets, dragées, hard and soft gelatin capsules, solutions, emulsions or suspensions), nasally (e.g. in the form of nasal sprays), rectally (e.g. in the form of suppositories) or topical ocularly (e.g. in the form of solutions, ointments, gels or water soluble polymeric inserts).
• the administration can also be effected parenterally, such as intramuscularly, intravenously, or intraocularly (e.g. in the form of sterile injection solutions).
• the compound of formula (I) and their pharmaceutically acceptable salts can be processed with pharmaceutically inert, inorganic or organic adjuvants for the production of tablets, coated tablets, dragées, hard gelatin capsules, injection solutions or topical formulations Lactose, corn starch or derivatives thereof, talc, stearic acid or its salts etc. can be used, for example, as such adjuvants for tablets, dragées and hard gelatin capsules.
• Suitable adjuvants for soft gelatin capsules are, for example, vegetable oils, waxes, fats, semi-solid substances and liquid polyols, etc.
• Suitable adjuvants for the production of solutions and syrups are, for example, water, polyols, saccharose, invert sugar, glucose, etc.
• Suitable adjuvants for injection solutions are, for example, water, alcohols, polyols, glycerol, vegetable oils, etc.
• Suitable adjuvants for suppositories are, for example, natural or hardened oils, waxes, fats, semi-solid or liquid polyols, etc.
• Suitable adjuvants for topical ocular formulations are, for example, cyclodextrins, mannitol or many other carriers and excipients known in the art.
• the pharmaceutical preparations can contain preservatives, solubilizers, viscosity-increasing substances, stabilizers, wetting agents, emulsifiers, sweeteners, colorants, flavorants, salts for varying the osmotic pressure, buffers, masking agents or antioxidants. They can also contain still other therapeutically valuable substances.
• the following examples illustrate the present invention without limiting it, but serve merely as representative thereof.
• the pharmaceutical compositions conveniently contain about 1- 500 mg, particularly 1-100 mg, of a compound of formula (I).
• the pharmaceutical compositions conveniently contain about 1-500 mg, particularly 1-100 mg, of a compound of formula (II).
• compositions containing a compound of formula (I) contains in addition about 1-500 mg, particularly 80 mg, of an orthosteric EGFR inhibitor in a fixed-dose combination.
• compositions according to the invention are: Preparation of pharmaceutical compositions comprising the compound of the invention: Tablets of the following composition are manufactured in the usual manner: Manufacturing Procedure 1. Mix ingredients 1, 2, 3 and 4 and granulate with purified water. 2. Dry the granules at 50°C. 3. Pass the granules through suitable milling equipment. 4. Add ingredient 5 and mix for three minutes; compress on a suitable press. Capsules of the following composition are manufactured in the usual manner: Ingredient mg/capsule anu actur ng rocedure 1.
• a compound of formula (I) lactose and corn starch are firstly mixed in a mixer and then in a comminuting machine. The mixture is returned to the mixer; the talc is added thereto and mixed thoapproximatively. The mixture is filled by machine into suitable capsules, e.g. hard gelatin capsules.
• Step 2 6-Bromo-4,7-dichloro-1H-indazole
• hydrazine hydrate 3.86 g.3.78 ml, 77.2 mmol, 2.0 equiv.
• the mixture was stirred at room temperature for 3 days.
• Hydrazine hydrate (386 mg, 0.38 ml, 7.72 mmol, 0.2 equiv.) was added and the mixture was warmed to 70 °C for 7 hours.
• Step 3 Ethyl 2-(6-bromo-4,7-dichloro-indazol-2-yl)acetate
• 6-bromo-4,7-dichloro-1H-indazole Example 1, step 2
• ethyl 2-bromoacetate 9.85 g, 6.53 ml, 59 mmol, 2.0 equiv.
• the reaction mixture was stirred for 16 hours at 100 °C. Ice was added and the precipitated solid was collected by filtration and washed with water. The compound was crystallized from boiling ethanol.
• Step 4 tert-Butyl (2S,4R)-2-[2-(6-bromo-4,7-dichloro-indazol-2-yl)-3-ethoxy-3-oxo-propanoyl]- 4-fluoro-pyrrolidine-1-carboxylate
• (2S,4R)-1-(tert-butoxycarbonyl)-4-fluoropyrrolidine-2-carboxylic acid (2.34 g, 10 mmol, 1.55 equiv.) in tetrahydrofuran (11 ml) was cooled in an ice bath.
• Carbonyldiimidazole (1.63 g, 10 mmol, 1.55 equiv.
• Step 5 Ethyl 2-(6-bromo-4,7-dichloro-indazol-2-yl)-2-[(6R)-6-fluoro-3-thioxo-2,5,6,7- tetrahydropyrrolo[1,2-c]imidazol-1-yl]acetate
• a solution of tert-butyl (2S,4R)-2-[2-(6-bromo-4,7-dichloro-indazol-2-yl)-3-ethoxy-3-oxo- propanoyl]-4-fluoro-pyrrolidine-1-carboxylate (Example 1, step 4) (4.23 g, 6.41 mmol) in HCl, 4M in dioxane (11 ml) was stirred for 1 hour at room temperature.
• Step 6 Ethyl 2-(6-bromo-4,7-dichloro-indazol-2-yl)-2-[(6R)-6-fluoro-6,7-dihydro-5H- pyrrolo imidazol-1-yl]acetate
• a solution of ethyl 2-(6-bromo-4,7-dichloro-indazol-2-yl)-2-[(6R)-6-fluoro-3-thioxo-2,5,6,7- tetrahydropyrrolo[1,2-c]imidazol-1-yl]acetate (Example 1, step 5) (1.46 g, 2.88 mmol) in acetic acid (10 ml) was cooled to 10°C.
• Hydrogen peroxide 35% (1.12 g, 1.01 ml, 11.5 mmol, 4 equiv.) was added dropwise. The reaction mixture was stirred for 1 hour at room temperature. The excess of hydrogen peroxide was destroyed by addition of saturated sodium sulfit solution. After addition of some water (just enough to dissolve all salts) and ethyl acetate the mixture was brought to pH 9 by careful addition of solid sodium carbonate. The mixture was extracted with ethyl acetate. The organic layers were washed with water, dried over sodium sulphate and concentrated.
• Step 7 Ethyl 2- 6-(4-morpholinophenyl)indazol-2-yl]-2-[(6R)-6-fluoro-6,7- dihydro-5H-pyrrolo[1,2-c]imidazol-1-yl]acetate Ethyl 2-(6-bromo-4,7-dichloro-indazol-2-yl)-2-[(6R)-6-fluoro-6,7-dihydro-5H-pyrrolo[1,2- c]imidazol-1-yl]acetate (Example 1, step 6) (100 mg, 0.21 mmol), (4-morpholinophenyl)boronic acid (130 mg, 0.63 mmol, 3 equiv.) and cesium carbonate (205 mg, 0.63 mmol, 3 equiv.) were mixed with toluene (3.0 ml), degassed by bubbling argon through the mixture under ultra sonic treatment.
• the reaction mixture was stirred for 2 hours at room temperature.
• HCl (5 N aq., 520 ⁇ L, 2.6 mmol, Eq: 2.0) was added (pH 6).
• Toluene was added, the reaction mixture was concentrated in vacuo.
• the carboxylic acid was dissolved in DMSO (6 mL), thiazol-2-amine (195 mg, 1.95 mmol, Eq: 1.5), DIPEA (840 mg, 1.14 mL, 6.5 mmol, Eq: 5.0) and HATU (742 mg, 1.95 mmol, Eq: 1.5) were added.
• the reaction mixture was stirred for 1.5 hours at room temperature.
• the reaction mixture was poured into EtOAc/THF 2:1 and washed with water and brine.
• reaction mixture was stirred at 0-5 °C for 20 minutes, then at room temperature for 16 hours.
• Saturated aqueous NaHCO3- solution (300 mL) was added carefully under ice cooling.
• the reaction mixture was stirred at room temperature for 1 hour.
• the reaction mixture was poured into dichloromethane and washed with water. The organic layer was dried over sodium sulfate, filtered and concentrated in vacuo.
• the crude material was purified by flash chromatography (silica gel, 120 g, 100% pentane) to afford the title compound (18.6 g, 87% yield) as a colourless oil.
• Lithium diisopropylamide solution (2 M in tetrahydrofuran/heptane/ethylbenzene, 66.3 mL, 133 mmol, 1.2 equiv) was added dropwise maintaining the temperature below -70 °C. The reaction mixture was stirred at -75 °C for 30 minutes. Ethyl formate (16.4 g, 17.7 mL, 220 mmol, 2.0 equiv) was added below -70 °C. The reaction mixture was stirred at -75 °C for 30 minutes. Acetic acid (16.6 g, 15.8 mL, 277 mmol, 2.5 equiv) was added below -55 °C.
• Step 4 tert-Butyl (5R)-5-[2-[6-bromo-4-(difluoromethyl)-7-methyl-indazol-2-yl]-3-ethoxy-3- oxo-propanoyl]-4-azaspiro[2.4]heptane-4-carboxylate
• tert-butyl (5R)-5-(imidazole-1-carbonyl)-4-azaspiro[2.4]heptane-4-carboxylate To a solution of (5R)-4-tert-butoxycarbonyl-4-azaspiro[2.4]heptane-5-carboxylic acid (CAS # 2007916-06-3, 1.02 g, 4.21 mmol, 1.0 equiv) in dichloromethane (17 mL) was added 1,1'- carbonyldiimidazole (818 mg, 5.04 mmol, 1.2 eq) in three portions and the reaction mixture was stirred at room temperature for 2.5 hours.
• the reaction mixture was stirred at room temperature for 1 hour.
• HCl (4 M in 1,4-dioxane, 1 mL, 4.0 mmol, 1.21 equiv) was added and the reaction mixture was stirred at room temperature for 30 minutes.
• HCl (4 M in 1,4-dioxane, 1 mL, 4.0 mmol, 1.21 equiv.) was added and the reaction mixture was stirred at room temperature for 30 minutes.
• the reaction mixture was diluted with ethanol (7.6 mL) and water (2.0 mL). Potassium thiocyanate (419 mg, 4.31 mmol, 1.3 equiv) was added and the reaction mixture was stirred at room temperature for 1 hour.
• the reaction mixture was cooled and pyridine (3.91 g, 4 mL, 49.46 mmol, 14.9 equiv) was added slowly. The reaction mixture was stirred at room temperature for 1 hour. The reaction mixture was poured into 1 N KHSO 4 + water and extracted three times with ethyl acetate. The organic layers were washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo. The crude material was dissolved in acetic acid (7.6 mL) and cooled to 0 °C. Hydrogen peroxide (35 wt.% solution in water, 0.580 mL, 6.62 mmol, 2.0 equiv) was added dropwise at 0 °C.
• Step 7 2-[4-(Difluoromethyl)-7-methyl-6-(4-morpholinophenyl)indazol-2-yl]-2-spiro[6,7- dihydropyrrolo[1,2-c]imidazole-5,1'-cyclopropane]-1-yl-N-thiazol-2-yl-acetamide
• 2-[4-(difluoromethyl)-7-methyl-6-(4-morpholinophenyl)indazol-2-yl]-2- spiro[6,7-dihydropyrrolo[1,2-c]imidazole-5,1'-cyclopropane]-1-yl-acetate (Example 1, step 6) (346 mg, 0.55 mmol, 1.0 equiv) in ethanol (1.8 mL) and tetrahydrofuran (1.8 mL) was added lithium hydroxide (1 M aqueous solution, 0.64 mL, 0.64 m
• the reaction mixture was stirred at room temperature for 1.5 hours.
• the reaction mixture was evaporated and co- evaporated with toluene twice.
• the residue was suspended in N,N-dimethylformamide (1.8 mL) and N,N-diisopropylethylamine (0.30 mL, 1.72 mmol, 3.1 equiv), thiazol-2-amine (72 mg, 0.72 mmol, 1.3 equiv) and HATU (274 mg, 0.72 mmol, 1.3 equiv) were added.
• the reaction mixture was stirred at room temperature for 45 minutes.
• the reaction mixture was extracted with ethyl acetate and water.
• the aqueous layer was backextracted with ethyl acetate.
• Step 2 2[-2-(6-Bromo-4-fluoro-indazol-2-yl)-3-ethoxy-3-oxo-propanoyl]pyrrolidine-1- carboxylate
• Ethyl 2-(6-bromo-4-fluoro-indazol-2-yl)acetate (1 eq.) was reacted with a CDI pre-activated tert- butoxycarbonyl)-L-proline (CAS15761-39-4) (1.55 eq.) in the presence of LDA (1.55 eq.) in THF at -70 °C to rt.
• Step 3 ethyl 2-(6-bromo-4-fluoro-indazol-2-yl)-2-(3-thioxo-2,5,6,7- c]imidazole-1-yl)acetate 2[-2-(6-Bromo-4-fluoro-indazol-2-yl)- oxo- pyrrolidine-1-carboxylate (1 eq) was reacted with HCl (in dioxane) at rt.
• reaction was stirred for 1 hour, the solvent was evaporated and the residue was concentrated and coevaporated with toluene twice to remove water.
• the reaction mixture was diluted in N,N- dimethylformamide (3 mL) and N,N-diisopropylethylamine (345 mg, 0.466 mL, 2.67 mmol, 3 equiv), thiazol-2-ylamine (116 mg, 1.16 mmol, 1.3 equiv) and HATU (440 mg, 1.16 mmol, 1.3 equiv) were added.
• the reaction was diluted with water and extracted twice with ethyl acetate. The combined organic layers were dried over sodium sulfate, filtered and concentrated.
• the vial was capped and heated in the microwave at 110 °C for 20 minutes then 4-ethynylbenzaldehyde (49 mg, 0.375 mmol, 1 equiv) was added and the vial was again heated at 110 °C for 20 minutes. This procedure was repeated three times. In total, the reaction mixture was stirred 5x20 minutes at 110 °C. The reaction mixture was poured into water and extracted with ethyl acetate (4x). The combined organic layers were washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo.
• the crude was purified by flash chromatography (silica gel, methanol in ethyl acetate 0 % to 10 %) and was further combined with piperidin-4-ol (1.3 eq) and sodium triacetoxyborohydride (70 mg, 0.332 mmol, 1.6 equiv).
• the reaction mixture was stirred at room temperature for 3 hours.
• the reaction mixture was poured into NaHCO3 sat sol and extracted three times with a mixture of dichloromethane/methanol 9:1.
• the combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo.
• Step 3 Ethyl 2-[6-bromo-4-(difluoromethyl)-7-methyl-indazol-2-yl]-2-(6,7-dihydro-5H- pyrrolo[1,2-c]imidazol-1-yl)acetate
• Step 6 ethyl 2-[6-bromo-4-(difluoromethyl)-7-methyl-indazol-2-yl]- 2-(3-thioxo-2,5,6,7-tetrahydropyrrolo[1,2-c]imidazol-1-yl)acetate (1.06 g, 85% purity, 1.86 mmol) was treated with hydrogen peroxide and p-toluenesulfonic acid monohydrate to give the title compound as a yellow foam (360 mg, 43% yield).
• Step 4 2-[6-Bromo-4-(difluoromethyl)-7-methyl-indazol-2-yl]-2-(6,7-dihydro-5H-pyrrolo[1,2- c]imidazol-1-yl)-N-thiazol-2-yl-acetamide
• MS: m/e 509.1/511.1 (M+H + )
• step 7 starting from ethyl 2-[6-bromo-4- (difluoromethyl)-7-methyl-indazol-2-yl]-2-(6,7-dihydro-5H-pyrrolo[1,2-c]imidazol-1-yl)acetate (Example 5, step 3) and thiazol-2-amine.
• Step 5 2-[4-(Difluoromethyl)-6-[2-[4-[[4-(hydroxymethyl)-1-piperidyl]methyl]phenyl]ethynyl]- 7-methyl-indazol-2-yl]-2-(6,7-dihydro-5H-pyrrolo[1,2-c]imidazol-1-yl)-N-thiazol-2-yl- acetamide
• MS: m/e 656.5 (M+H + )
• step 10 starting from 2-[6-bromo-4-(difluoromethyl)-7- methyl-indazol-2-yl]-2-(6,7-dihydro-5H-pyrrolo[1,2-c]imidazol-1-yl)-N-thiazol-2-yl-acetamide (Example 5, step 4) and [1-[(4-ethynylphenyl)methyl]-4-
• Step 2 2-[6-Bromo-4-(difluoromethyl)-7-methyl-indazol-2-yl]-2-spiro[6,7-dihydropyrrol[1,2- c]imidazole-5,1'-cyclopropane]-1-yl-acetic acid ethyl ester
• step 5 (5S)-5-[2-[6-bromo-4-(difluoromethyl)-7-methyl-indazol-2-yl]- 3-ethoxy-3-keto-propanoyl]-4-azaspiro[2.4]heptane-4-carboxylic acid tert-butyl ester was deprotected using HCl in dioxane followed by reaction with potassium thio
• step 6 the intermediate was treated with hydrogen peroxide in AcOH to give the title compound as a light yellow foam.
• MS: m/e 481.2 ([M+H] + )
• Step 3 2-[6-Bromo-4-(difluoromethyl)-7-methyl-indazol-2-yl]-2-spiro[6,7-dihydropyrrol[1,2- c]imidazole-5,1'-cyclopropane]-1-yl-N-thiazol-2-yl-acetamide
• MS: m/e 535.0 (M+H + )
• step 7 starting from 2-[6-bromo-4- (difluoromethyl)-7-methyl-indazol-2-yl]-2-spiro[6,7-dihydropyrrol[1,2-c]imidazole-5,1'- cyclopropane]-1-yl-acetic acid e
• Step 4 2-[4-(Difluoromethyl)-6-[2-(4-formylphenyl)ethynyl]-7-methyl-indazol-2-yl]-2- spiro[6,7-dihydropyrrol[1,2-c]imidazole-5,1'-cyclopropane]-1-yl-N-thiazol-2-yl-acetamide
• MS: m/e 583.3 (M+H + )
• step 10 starting from 2-[6-bromo-4- (difluoromethyl)-7-methyl-indazol-2-yl]-2-spiro[6,7-dihydropyrrol[1,2-c]imidazole-5,1'- cyclopropane]-1-yl-N-thiazol-2-yl-acetamide (Example 6, step 3) and 4-ethynylbenzaldehyde
• Step 5 2- -1-piperidyl]methyl]phenyl]ethynyl]- 7-methyl-indazol-2-yl]-2-(5-ethyl-5-methyl-6,7-dihydropyrrolo[1,2-c]imidazol-1-yl)-N-thiazol- 2-yl-acetamide
• Morpholinosulfur trifluoride (CAS 51010-74- 3, 24.8 g, 17.3 mL, 135 mmol, Eq: 1.5) was added in portions. The reaction mixture was stirred at 0-5 °C for 20 min, then stirred for 16 hours at room temperature. With ice cooling, saturated aqueous NaHCO3 (300 mL) was added carefully. The reaction mixture was stirred for 1 hour at room temperature. The reaction mixture was poured into DCM and washed with water. The organic layer was dried over Na 2 SO 4 and concentrated in vacuo. The crude material was purified by flash chromatography (silica gel, 120 g, 100% pentane) to give the title compound as a colourless oil (18.6 g, 87% yield).
• O-Methylhydroxylamine hydrochloride (10.2 g, 122 mmol, Eq: 1.84) and K 2 CO 3 (30.6 g, 221 mmol, Eq: 3.34) were added.
• the reaction mixture was stirred for 2.5 hours at 45 °C then filtered through sintered glass and washed with DME (2 x). The filtrate was concentrated in vacuo.
• the oxime ether intermediate was dissolved in DMSO (150 mL). Hydrazine hydrate (83 g, 80.5 mL, 1.66 mol, Eq: 25) was added.
• the reaction mixture was stirred for 3 hours at 110 °C.
• the reaction mixture was poured into EtOAc/THF 5:1 and washed with water and brine.
• Step 3 Ethyl 2-[6-bromo-4-(difluoromethyl)-7-methyl-indazol-2-yl]acetate
• 6-bromo-4-(difluoromethyl)-7-methyl-1H-indazole (Example 1, step 2) (19 g, 72.8 mmol, Eq: 1.0) in DMF (75 mL) was added ethyl 2-bromoacetate (18.2 g, 12.2 mL, 109 mmol, Eq: 1.5).
• the reaction mixture was stirred for 16 hours at 100 °C.
• the reaction mixture was poured into EtOAc and washed with water and brine.
• the organic layer was dried over Na2SO4 and concentrated in vacuo.
• Step 4 tert-Butyl (2S,4R)-2-[2-[6-bromo-4-(difluoromethyl)-7-methyl-indazol-2-yl]-3-ethoxy-3- oxo-propanoyl]-4-fluoro-pyrrolidine-1-carboxylate
• tert-butyl (2S,4R)-4-fluoro-2-(imidazole-1-carbonyl)pyrrolidine-1-carboxylate To a solution of (2S,4R)-1-tert-butoxycarbonyl-4-fluoro-pyrrolidine-2-carboxylic acid (CAS 203866-14-2, 30 g, 129 mmol, Eq: 1.0) in DCM (300 mL) was added 1,1'-carbonyldiimidazole (25 g, 154 mmol, Eq: 1.2) in portions at 0 °C.
• Example 1 A solution of ethyl 2-[6-bromo-4-(difluoromethyl)-7-methyl-indazol-2- yl]acetate (Example 1, step 3) (7 g, 20.2 mmol, Eq: 1.0) in THF (24 mL) was added dropwise below ⁇ 50 °C. The reaction mixture was stirred for 1 hour between ⁇ 50 °C and ⁇ 55 °C.
• the reaction mixture was stirred for 1 hour at 55 °C.
• the reaction mixture was cooled to rt, then water (6 mL) and potassium thiocyanate (2.55 g, 26.2 mmol, Eq: 1.3) were added.
• the reaction mixture was stirred for 30 min at rt.
• the ethanol was removed in vacuo at 30 °C, and pyridine (23.9 g, 24.5 mL, 302 mmol, Eq: 15) was added.
• the reaction mixture was stirred at room temperature for 75 min.
• the reaction mixture was poured into EtOAc and washed with 2 N aqueous HCl (until the aqueous phase was pH 1), water and brine.
• Step 6 Ethyl 2-[6-bromo-4-(difluoromethyl)-7-methyl-indazol-2-yl]-2-[(6R)-6-fluoro-6,7- 5H-pyrrolo[1,2-c]imidazol-1-yl]acetate
• acetonitrile 70 mL
• hydrogen peroxide 35% aq., 8.38 g, 7.42 mL, 86.3 mmol, Eq: 7.5
• Step 10 2-[4-(Difluoromethyl)-6-[2-[4-[[4-(hydroxymethyl)-1- indazol-2-yl]-2-[(6R)-6-fluoro-6,7-dihydro-5H- yl-acetamide 2-[6-Bromo-4-(difluoromethyl)-7-methyl-indazol-2-yl]-2-[(6R)-6-fluoro-6,7-dihydro-5H- pyrrolo[1,2-c]imidazol-1-yl]-N-thiazol-2-yl-acetamide (Example 1, step 7) (100 mg, 0.19 mmol) and [1-[(4-ethynylphenyl)methyl]-4-piperidyl]methanol hydrochloride (Example 1, step 9) (76 mg, 0.286 mmol, Eq: 1.5) were dissolved in 5 ml of DMF.
• Triethylamine (0.1 ml, 0.76 mmol, Eq: 4.0), bis-(triphenylphosphine)-palladium(II)dichloride (7 mg, 0.01 mmol, Eq: 0.05), triphenylphosphine (5 mg, 0.019 mmol, Eq: 0.1) and copper(I)iodide (2 mg, 0.01 mmol, Eq: 0.05) were added and the mixture was stirred for 2 hours at 80°C. The reaction mixture was extracted with water and three times with dichloromethane. The organic layers were dried over sodium sulfate and concentrated to dryness.
• Example 8 in vitro characterization Cell lines Ba/F3 cell lines stably expressing the EGFR mutants L858R (#2039), L858R/C797S (#C2052) and L858R/T790M/C797S (#2056) were purchased from CrownBio.
• NCI-H1975 cells #CRL- 5908
• NCI-H2073 cells #CRL-5918
• A431 cells #CRL-1555
• NCI-H3255 cells were obtained from the NCI (#CVCL_6831). Cells were maintained in a humidified incubator at 37 °C and 5% CO 2 .
• Ba/F3 EGFR-LR, Ba/F3 EGFR-LRTM, Ba/F3 EGFR-LRCS and Ba/F3 EGFR-LRTMCS cells were grown in RPMI 1640 GlutaMAX medium (Thermo Fisher Scientific #61870010) supplemented with 10% fetal bovine serum (FBS; VWR #07068-085).
• NCI-H1975, NCI-H3255, NCI-H2073, A431 and PC-9 cells were cultured in RPMI 1640 medium with ATCC modification (Thermo Fisher Scientific #A10491) supplemented with 10% FBS. Verification of cell line identities and absence of cross-contaminations by other cell lines was performed through Short Tandem Repeats- PCR analysis (only human cell lines) and MALDI-TOF analysis. Absence of mycoplasma contamination was verified through testing of antibiotic-free cultured cells for 10-14 days through the kit MycoAlert TM Mycoplasma Detection Kit (Lonza #LT07-318). All cell lines were used for no more than 20 passages after thawing for all described experiments.
• HTRF Homogeneous Time Resolved Fluorescence
• cells were transferred into RPMI 1640 no phenol red medium (Thermo Fisher Scientific #11835063) containing 10% FBS and were plated into 384-well plates (Greiner #781080) at a density of 15’000 cells/well (Ba/F3), 16’000 cells/well (H1975) and 10’000 cells/well (H3255) in a volume of 12 ⁇ l/well. 5’000 cells/well (H2073) and 10’000 cells/well (A-431) were plated in a volume of 11 ⁇ l/well.
• Control wells with medium only were also prepared. Plates were centrifuged at 300 g for 30 sec and incubated overnight at 37 °C. The next day, compounds were added to concentrations ranging from 0.316 nM to 10 mM with a 1 ⁇ 4 log dilution and DMSO (Sigma #D2650) was compensated accordingly to a final content of 0.1%. Plates were incubated at 37 °C for 4 hours. Particularly for H2073 and A-431 cells, 1 ⁇ l of 300 ng/ml EGF (final concentration 25 ng/ml) was added to each well after the 4-hour incubation and cells were incubated at 37 °C for another 5 min.
• HTRF assay for pEGFR (CisBio #64EG1PEH) or pERK (CisBio #64AERPEH) was then performed according to the manufacturer’s instructions.
• Cell viability assay For the cell viability assays, Ba/F3 cells in growth medium containing 10% FBS were plated in 384-well black clear bottom plates (Falcon #353962) at 2’000 cells/well in 50 ⁇ l, and compounds were added to concentrations ranging from 0.316 nM to 10 mM with a 1 ⁇ 4 log dilution and DMSO (Sigma #D2650) was compensated accordingly to a final content of 0.1%. Plates were incubated for 72 hours at 37 °C. After treatment with compounds, 25 ⁇ l/well CellTiter-Glo 2.0 reagent (Promega #G9243) were added and plates were incubated for 10 min at RT and luminescence was quantified according to the manufacturer’s protocol.
• Subcutaneous cell line derived models with Ba/F3 cell clones were established through cell injection (1x10 7 ) to the right flank of female Balb/c nude mice. Compound treatment was initiated after randomization when tumors reached 100-200 mm 3 in size.
• Subcutaneous cell line derived xenograft model of human NSCLC NCI-H1975 5x10 6 cells were injected to the right flank of female Balb/c mice, which were randomized and assigned to treatment groups after tumors reached about 150 mm 3 .
• mice The inoculation procedure was performed with the support of a stereotactic device and anesthesia for the surgery carried out with isoflurane / O 2 using an inhalation mask.
• Allosteric EGFR inhibitor Example 6 was formulated with 10% PEG400 and 5% solutol in water and osimertinib with 1% DMSO and 30% PEG300 in water.
• Tumor growth inhibition was calculated according to the formula: 100 - [average (TVtreatment-TVbaseline) / average (TVvehicle- TVbaseline)] based on medians.
• Tumor regression was calculated according to the formula: average [(TV baseline -TV treatment ) / TV baseline ) x 100 based on medians. Positive values indicate tumor regression.
• the allosteric EGFR inhibitor is a compound of formula (I) wherein L is a bond or alkynylene; R 1 is hydrogen or halogen; R 2 and R 2’ are independently selected from hydrogen and alkyl; or R 2 and R 2’ , together with the carbon atom to which they are attached, form cycloalkyl; R 3 is hydrogen, halogen or haloalkyl; R 4 is alkyl or halogen; R 5 is (heterocycloalkyl)alkylene or heterocycloalkyl, wherein (heterocycloalkyl)alkylene is optionally substituted with one or two substituents independently selected from R 6 , and wherein heterocycloalkyl is optionally substituted with one or two substituents independently selected from R 7 ; R 6 is at each instance independently selected from alkyl, cycloalkyl, hydroxy and hydroxyalkyl; and R 7 is at each instance independently selected from alkyl, cycloal
• R 1 is hydrogen or fluoro.
• R 2 and R 2’ are hydrogen or together with the carbon atom to which they are attached, form cyclopropyl.
• R 3 is halogen or haloalkyl.
• R 3 is chloro or difluoromethyl.
• R 4 is methyl or chloro. 9.
• R 5 is morpholinyl or piperidinylmethylene optionally substituted with hydroxymethyl.
• the compound of formula (I) is selected from 2-[4,7-dichloro-6-(4-morpholinophenyl)indazol-2-yl]-2-[(6R)-6-fluoro-6,7-dihydro-5H- pyrrolo[1,2-c]imidazol-1-yl]-N-thiazol-2-yl-acetamide; 2-[4-(difluoromethyl)-7-methyl-6-(4-morpholinophenyl)indazol-2-yl]-2-[(6R)-6-fluoro-6,7- dihydro-5H-pyrrolo[1,2-c]imidazol-1-yl]-N-thiazol-2-yl-acetamide ; 2-[4-(difluoromethyl)-7-
• orthosteric EGFR inhibitor is selected from cetuximab, panitumumab, osimertinib, erlotinib, gefitinib, necitumumab, neratinib, lapatinib, vandetanib, brigatinib, almonertinib, lazertinib and furmonertinib, or a pharmaceutically acceptable salt thereof, in particular selected from osimertinib, almonertinib, lazertinib and furmonertinib, or a pharmaceutically acceptable salt thereof. 17.
• a combination according to any one of embodiments 1 to 16, wherein the orthosteric EGFR inhibitor is osimertinib, or a pharmaceutically acceptable salt thereof. 18. A combination according to any one of embodiments 1 to 16, wherein the orthosteric EGFR inhibitor is almonertinib, or a pharmaceutically acceptable salt thereof. 19. A combination according to any one of embodiments 1 to 16, wherein the orthosteric EGFR inhibitor is lazertininb, or a pharmaceutically acceptable salt thereof. 20. A combination according to any one of embodiments 1 to 16, wherein the orthosteric EGFR inhibitor is furmonertinib, or a pharmaceutically acceptable salt thereof. 21. A combination according to any one of embodiments 1 to 16, for use as therapeutically active substance. 22.
• a pharmaceutical composition comprising a combination according to any one of embodiments 1 to 20 and a therapeutically inert carrier.
• a method for the treatment or prophylaxis of cancer, in particular non-small cell lung cancer which method comprises administering an effective amount of a combination according to any one of embodiments 1 to 20 to a patient in need thereof.
• 28. A combination, a use, a method or a pharmaceutical composition according to any one of embodiments 21 to 27, wherein the allosteric EGFR inhibitor and the orthosteric EGFR inhibitor are both administered orally.
• 29. A combination, a use, a method or a pharmaceutical composition according to any one of embodiments 21 to 28, wherein the allosteric EGFR inhibitor is administered concurrently with the orthosteric EGFR inhibitor.
• 31. A combination, a use, a method or a pharmaceutical composition according to any one of embodiments 21 to 28, wherein the allosteric EGFR inhibitor and the orthosteric EGFR inhibitor are administered sequentially.
• 32. A combination, a use, a method or a pharmaceutical composition according to any one of embodiments 23 to 27, wherein the cancer is associated with at least one EGFR mutation selected from del19, L858R, T790M and C797S.
• 33. A combination, a use, a method or a pharmaceutical composition according to any one of embodiments 23 to 27, wherein the cancer is associated with at least two EGFR mutations selected from del19, L858R, T790M and C797S.

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