CN112028874A - Synthesis method of eritinib - Google Patents

Synthesis method of eritinib Download PDF

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CN112028874A
CN112028874A CN202010946680.1A CN202010946680A CN112028874A CN 112028874 A CN112028874 A CN 112028874A CN 202010946680 A CN202010946680 A CN 202010946680A CN 112028874 A CN112028874 A CN 112028874A
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eritinib
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CN112028874B (en
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周丽华
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Shanghai Heyonghui Technology Development Co.,Ltd.
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Suzhou Fude Zhaofeng Biochemical Technology Co Ltd
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    • C07DHETEROCYCLIC COMPOUNDS
    • C07D401/00Heterocyclic 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
    • C07D401/02Heterocyclic 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
    • C07D401/04Heterocyclic 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 directly linked by a ring-member-to-ring-member bond

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Abstract

The present invention relates to a process for the preparation of eritinib or a pharmaceutically acceptable salt thereof. The invention also relates to intermediate compounds useful in this process and to the preparation of such intermediate compounds.

Description

Synthesis method of eritinib
Technical Field
The present invention relates to a process for the preparation of eritinib or a pharmaceutically acceptable salt thereof. The invention also relates to intermediate compounds useful in this process and to the preparation of such intermediate compounds.
Background
The chemical name of the Alitinib (Alectonib) is 9-ethyl-6, 11-dihydro-6, 6-dimethyl-8- [4- (4-morpholinyl) -1-piperidyl ] -11-oxo-5H-benzo [ b ] carbazole-3-carbonitrile, and the structural formula can be represented by the following formula I
Figure BDA0002675531170000011
Eritinib eride is a second generation oral drug that selectively inhibits Anaplastic Lymphoma Kinase (ALK) activity. It is particularly useful for treating non-small cell lung cancer (NSCLC) expressing ALK-EML4 (acanthocortin microtubule-associated protein-like 4) fusion protein, thereby causing NSCLC cell proliferation. Inhibition of ALK prevents phosphorylation and subsequent downstream activation of STAT3 and AKT, thereby reducing the viability of tumor cells.
The synthesis of eritinib and its hydrochloride salts is described in WO2010143664, WO2012023597, Bioorganic & Medicinal Chemistry Letters,2012,20, 1271-. In general, there are three synthetic routes, as shown in the following scheme:
Route 1:
Figure BDA0002675531170000021
Route 2:
Figure BDA0002675531170000022
Route 3:
Figure BDA0002675531170000031
the three synthetic routes described above all have several disadvantages: the high cost, expensive reagents and/or catalysts and inconvenient operating conditions inherent to long reaction sequences.
Therefore, there is still much room for improvement in this process, and there is a need to develop an efficient, simple, and industrially feasible synthetic route to overcome the disadvantages of the prior art.
In order to overcome the problems associated with the prior art, the present invention describes a new and improved process which provides eritinib, or a pharmaceutically acceptable salt thereof, in higher yields using cheaper and less toxic reagents.
Definition of
The following definitions apply to definitions relating to the present application, unless otherwise indicated.
The term "room temperature" means a temperature of between 15 ℃ and 35 ℃, preferably a temperature of between 20 ℃ and 30 ℃, more preferably a temperature of 25 ℃.
The term "pharmaceutically acceptable salts" includes salts with inorganic acids, such as hydrochloric acid, hydroiodic acid, phosphoric acid, phosphonic acid, sulfuric acid, hydrobromic acid, or organic acids; organic acids, for example formic acid, acetic acid, citric acid, malic acid, maleic acid, tartaric acid, succinic acid, salicylic acid, trifluoroacetic acid, trichloroacetic acid, oxalic acid, benzoic acid or sulfonic acids, such as p-toluenesulfonic acid or methanesulfonic acid.
The term "alkyl" refers to a straight or branched chain hydrocarbon group containing 1 to 12 carbon atoms. Typical examples of alkyl groups include, but are not limited to, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl, n-hexyl, 3-methylhexyl, 2-dimethylpentyl, 2, 3-dimethylpentyl, n-heptyl, n-octyl, n-nonyl, and n-decyl.
The term "aryl" refers to a monocyclic or polycyclic ring system in which one or more of the fused rings is aromatic. Typical examples of aryl groups include, but are not limited to, anthracenyl, fluorenyl, indenyl, naphthyl, and phenyl.
Abbreviations
TEA: trimethylamine;
DBU: 1, 8-diazabicycloundec-7-ene;
DIPEA: diisopropylethylamine
And (3) Acac: acetylacetone
DCE: 1, 2-dichloroethane
Disclosure of Invention
In one aspect, the invention provides a method of preparing eritinib of formula I or a pharmaceutically acceptable salt thereof,
Figure BDA0002675531170000051
the method is characterized by comprising the following steps:
(a) reacting a compound of formula II with 4- (4-piperidinyl) morpholine in the presence of a base, a copper catalyst and a ligand to form a compound of formula III,
Figure BDA0002675531170000052
wherein X is selected from Cl, Br, I, OSO2Ar and OSO2CF3;R1Is any alkyl, preferably CH, CH2CH3Or C (CH)3)3
(b) By CH3CH2Reacting Y with a compound of formula III in the presence of a catalyst to form a compound of formula IV,
Figure BDA0002675531170000053
wherein Y is selected from Cl, Br and I;
(C) hydrolysis of the compound of formula IV to the corresponding carboxylic acid, followed by SOCl2、PCl5Or POCl3It is converted into a compound of formula V.
Figure BDA0002675531170000061
(d) Reacting 6-cyanoindole with a compound of formula V in the presence of a catalyst to form a compound of formula VI,
Figure BDA0002675531170000062
(e) reacting a compound of formula VI with acetone in the presence of a dehydrating agent selected from MgCl and a catalyst to form eritinib2、AlCl3,CaCl2
Figure BDA0002675531170000063
Molecular sieves and silica gel; the catalyst is selected from salts and/or complexes of chromium and cobalt.
The above procedure is preferably carried out by isolating all the intermediate compounds, i.e. the intermediates of formulae III, IV, V and VI. It is also preferred to carry out this process without isolation of intermediates of formulae III, IV, V and VI. More preferably, the above process is carried out as a one-pot reaction, i.e. the synthesis of eritinib or a pharmaceutically acceptable salt thereof, preferably the hydrochloride salt, is accomplished directly without isolation of any intermediate product of formulae iii, iv, v and vi.
The invention relates to a new and alternative synthesis method for synthesizing the eritinib shown in the formula I. The synthetic methods described herein provide for the preparation of eritinib by reducing production time and cost, and increasing cost effectiveness.
Figure BDA0002675531170000071
This process provides an economical process for the low cost production of eritinib. In order to achieve a strategy based on cheap, readily available chemical raw materials, step economy and overall high efficiency, the present invention relies on new reactions to be established in each synthetic step.
In a first aspect, the following scheme outlines the synthetic method described above:
Figure BDA0002675531170000072
Figure BDA0002675531170000073
Y=-GI-Br
coupling of a compound of formula II with 4- (4-piperidinyl) morpholine in the presence of a base, a copper catalyst and a ligand to form a compound of formula III. Wherein X is selected from Cl, Br, I, OSO2Ar and OSO2CF3; R1Is any alkyl, preferably CH, CH2CH3Or C (CH)3)3
The first step is a copper-catalyzed C-N coupling, the base can be any organic or inorganic base, such as TEA, DB, DIPEA, KOH, K2CO3、NaOH、Na2CO3、Cs2CO3、CsOH, K3PO4,k2HPO4、Na3PO4And Na2HPO4. Examples of copper catalysts include CuI, CuCl, CuBr, Cu2O、Cu(acac)2、CuCl2、CuBr2、CuI2、Cu(OAc)2、Cu(OTf)2、 Cu(ClO4)2And CuSO4. The ligand is selected from the group consisting of compounds of formula VII,
Figure BDA0002675531170000081
wherein R is2Selected from any alkyl group, substituted/unsubstituted aryl group. R2Preferably selected from methyl, ethyl, propyl, isopropyl, t-butyl and substituted/unsubstituted anthracenyl, fluorenyl, indanyl, indenyl, naphthyl and phenyl. Some examples of formula VIIAs follows (L1-L10):
Figure BDA0002675531170000082
the present invention utilizes for the first time the compound of formula VII in the coupling reaction of C-N bonds. The compound of formula VII is convenient to prepare, shows excellent selectivity and reaction efficiency in the coupling reaction of C-N bond, and is suitable for a wide range of substrates with different substituents.
The compound of formula VII can be prepared by reacting aldehyde, oxalyl hydrazine and ammonium acetate, and the reaction scheme is as follows:
Figure BDA0002675531170000083
the second step in the synthesis of eritinib is represented by formula III and CH3CH2Y is alkylated by Friedel-Crafts in the presence of a catalyst to form the compound of formula IV. Wherein Y is selected from Cl, Br and I, and the catalyst for Friedel-Crafts is selected from Lewis acids, such as AlCl3、BeCl2、CdCl2、 BF3、BBr3、GaCl3、AlBr3、FeCl3、TiCl4、SnCl4、SbCl5Lanthanide trihalides and alkylaluminum halides (AlRX)2)。
Next, the ester group of the compound of formula IV is hydrolyzed to a carboxylic acid, which is then reacted with SOCl2、 PCl5Or POCl3The reaction is converted to the compound of formula V.
Treatment of a compound of formula V with a 6-cyanoindole in the presence of a catalyst produces a compound of formula VI, which is typically a Friedel-Crafts acylation reaction. The catalyst for Friedel-Crafts acylation is selected from Lewis acids such as AlCl3、AlBr3Lanthanide trifluorides, zeolites, protic acids (e.g. H)2SO4、H3PO4)、FeCl3,ZnCl2And polyphosphoric acid.
The last step of the synthesis is in the removal ofCyclizing a compound of formula VI with acetone in the presence of a water reagent and a catalyst to form eritinib, wherein the dehydrating reagent is selected from MgCl2、AlCl3、CaCl2
Figure BDA0002675531170000091
Molecular sieves and silica gel; the catalyst is selected from salts and/or complexes of chromium and cobalt, such as CrCl3, CrF3,CrBr3,Cr(NO3)3,CoCl3,CoF3,CoBr3、Co(NO3)3
As shown in the scheme below, an example synthesis of eritinib starts from the coupling of methyl 4-bromobenzoate (II-1) and 4- (4-piperidinyl) morpholine. The resulting compound of formula iii is alkylated with ethyl bromide to form the compound of formula iv, which is converted to the compound of formula v by hydrolysis and chlorination. Friedel-Crafts acylation of compounds of formula V with 6-cyanoindoles provides compounds of formula VI. Finally, the compound of formula vi cyclizes with acetone in the presence of a dehydrating reagent and a catalyst to form eritinib.
Figure BDA0002675531170000101
Detailed Description
The following examples provide detailed experimental methods and parameters suitable for preparing eritinib, or a pharmaceutically acceptable salt thereof, according to the present invention, which experiments are intended to be illustrative and not limiting.
Unless otherwise indicated, all materials, solvents and reagents, including anhydrous solvents such as DMF and DCM, were best grade obtained from commercial suppliers without further purification. All reactions involving air or moisture sensitive compounds were carried out under nitrogen or argon atmosphere unless otherwise stated.
1H (400MHz) and13c NMR (100MHz) data Using CDCl3Or DMSO-D6Obtained as solvent on Bruker AVANCE II 400 MHz. Chemical shift () in ppm and coupling constant (J) in HzA bit.1H NMR spectra were recorded with tetramethylsilane (═ 0.00ppm) as internal reference;13CDCl for C NMR spectrum3(═ 77.00 pp pm) or DMSO-D6(═ 39.5ppm) was recorded as an internal reference.
Synthesis of L1:
Figure BDA0002675531170000102
to a solution of cyclohexanal (11.2g,100mmol), oxalyl hydrazine (6.5g, 55mmol) and ammonia acetate (8.5g, 110mmol) in methanol (200mL) was added iodine (2.5g, 10 mmol). The reaction mixture was refluxed for 20h and filtered. The resulting solid was washed three times with methanol (50mL) and diethyl ether (50mL) and then dried under vacuum to give the desired L1 as a yellow solid. Yield: 12g and 80 percent.1H NMR(400MHz,CDCl3)11.12(brs,2H),2.69-2.75(m,2H), 1.61-1.86(m,8H),1.33-1.63(m,12H)。13C NMR(100MHz,CDCl3) 163.5,159.3,39.5,33.0,26.1,26.4. Calculation of C by ESI-TOF-HRMS16H24N6Na (M + Na)323.1960 molecular weight, found 323.1924.
Synthesis of L6: .
Figure BDA0002675531170000111
To a solution of benzaldehyde (10.6g, 100mmol), oxalyl hydrazine (6.5g, 55mmol) and ammonium acetate (8.5g, 110mmol) in methanol (200mL) was added iodine (2.5g, 10 mmol). The reaction mixture was refluxed for 18h and filtered. The resulting solid was washed three times with methanol (50mL) and diethyl ether (50mL) and then dried under vacuum to give the desired L6 as a yellow solid. Yield: 11 g, 77%.1H NMR(400MHz,CDCl3)11.12(brs,2H),85-89(m,4h), 7.43-7.51(m,6h)。13C NMR(100MHz,CDCl3) 163.5,157.6,132.5,131.1,129.2,127.5. Calculation of C by ESI-TOF-HRMS16H12N6Na (M + Na)311.1021 molecular weight, found 311.1003.
Synthesis of L7: .
Figure BDA0002675531170000121
To a solution of 2,4, 6-trimethylbenzaldehyde (14.8g, 100mmol), oxalyl hydrazine (6.5g, 55mmol) and ammonia acetate (8.5g, 110mmol) in methanol (200mL) was added iodine (2.5g, 10 mmol). The reaction mixture was refluxed for 24h and filtered. The resulting solid was washed three times with methanol (50mL) and diethyl ether (50mL) and then dried under vacuum to give the desired L7 as a yellow solid. Yield: 12g, 65 percent.1H NMR(400MHz,CDCl3)11.12(brs,2H),7.01 (s,4H),2.57(s,12H),2.48(s,6H)。13C NMR(100MHz,CDCl3) 163.5,157.6,138.2,136.1,128.2,122.5,21.9,19.3. Calculation of C by ESI-TOF-HRMS22H24N6Na (M + Na)395.1960 molecular weight, found 395.1932.
Synthesis of a Compound of formula III-1 with L1
Figure BDA0002675531170000122
To methyl 4-bromobenzoate (21.5g, 100mmol), 4- (piperidin-4-yl) morpholine (18.7g, 110mmol) and K3PO4To a solution of (23.3g,110mmol) in DMF (100mL) were added CuI (1.9g, 10mmol) and L1(3g, 10 mmol). The reaction mixture was stirred at 100 ℃ for 10h, then extracted with ethyl acetate (300mL) and water (100 mL). The organic mixture was over MgSO4Drying, vacuum filtering, concentrating to obtain crude product, and purifying by flash column chromatography (n-hexane/ethyl acetate 5/1 eluent). The target compound of formula III-1 was obtained as a colorless oil. Yield: 22 g, 73 percent.1H NMR(400MHz,CDCl3)7.84(d,J=7.5Hz,2H),6.93(d, J=7.5Hz,2H),3.89(s,3H),3.57(t,J=7.1Hz,4H),3.03-3.16 (m,4H),2.59-2.64(m,1H),2.48(t,J=7.1Hz,4H),1.65-1.73 (m,2H),1.40-1.47(m,2H).13C NMR(100MHz,CDCl3)165.9, 153.9,130.8,123.1,111.7,70.4,67.0,52.1,52.0,51.5,28.1 ESI-TOF-HRMS calculation of C17H24N2NaO3(M + Na)327.1685 molecular weight, found 327.1648.
Synthesis of a Compound of formula III-1 with L6:
Figure BDA0002675531170000131
to methyl 4-bromobenzoate (21.5g, 100mmol), 4- (piperidin-4-yl) morpholine (18.7g, 110mmol) and K3CO3(15.2g,110mmol) in DMSO (100mL) Cu (OTF) was added2(3.6g, 10mmol) and L6(2.9g, 10 mmol). The reaction mixture was stirred at 100 ℃ for 12h, then extracted with ethyl acetate (300mL) and water (100 mL). The organic mixture was over MgSO4Drying, vacuum filtering, concentrating to obtain crude product, and purifying by flash column chromatography (n-hexane/ethyl acetate 5/1 eluent). The target compound of formula III-1 was obtained as a colorless oil. Yield: 23 g, 77%.
Synthesis of a Compound of formula III-1 with L7: .
Figure BDA0002675531170000132
To methyl 4-bromobenzoate (21.5g, 100mmol), 4- (piperidin-4-yl) morpholine (18.7g, 110mmol) and Cs2CO3(35.8g,110mmol) of CH3Adding Cu (acac) into CN (100mL)2(2.6g, 10mmol) and L7(3.7g, 10 mmol). The reaction mixture was stirred at 100 ℃ for 12h, then extracted with ethyl acetate (300mL) and water (100 mL). The organic mixture was over MgSO4Drying, vacuum filtering, concentrating to obtain crude product, and purifying by flash column chromatography (n-hexane/ethyl acetate 5/1 eluent). The target compound of formula III-1 was obtained as a colorless oil. Yield: 24 g, 80 percent.
Synthesis of compounds of formula iv:
Figure BDA0002675531170000141
stirring a mixture of formula III-1 (15g, 50mmol) and bromoethane (5.9g, 55mmol) and adding AlCl3(13g,100 mmol). The reaction mixture was stirred at 120 ℃ for 5h and then cooled to room temperature. DCM (200mL) was then added and the resulting mixture stirred for a further 1h before ice (200g) was added. The mixture was partitioned between DCM and water. The organic mixture was over MgSO4Drying, vacuum filtering, concentrating to obtain crude product, and purifying by flash column chromatography (n-hexane/ethyl acetate 6/1 eluent). The target compound of formula iv was obtained as a colorless oil. Yield: 12g and 72 percent.1H NMR(400MHz,CDCl3)7.69(s,1H),7.50(d,J=7.5Hz,1H), 6.84(d,J=7.5Hz,1H),3.89(s,3H),3.57(t,J=7.1Hz,4H), 3.03-3.16(m,4H),2.56-2.64(m,3H),2.48(t,J=7.1Hz,4H), 1.65-1.73(m,2H),1.40-1.47(m,2H),1.12(t,J=8.0Hz,3H)。13C NMR(100MHz,CDCl3)165.9,150.3,129.8,128.0,123.5, 119.5,108.7,70.4,67.0,52.4,52.0,51.5,28.1,23.7,14.5. Calculation of C by ESI-TOF-HRMS19H28N2NaO3(M + Na)355.1998 molecular weight, found 355.1974.
Synthesis of compounds of formula v.
Figure BDA0002675531170000151
Stirring CH of formula IV (6.6g, 20mmol)3CN (50mL) and water (50mL), LiOH (0.5g, 22mmol) was added. The reaction mixture was refluxed for 8h and cooled to room temperature. The resulting mixture was concentrated on a rotary evaporator to a volume of 60 mL. THF (80mL) was then added slowly to the crude reaction to give a white precipitate, which was filtered, washed with methanol (3X 30mL), and dried in vacuo. The resulting white solid was then dissolved in DCM (100mL), cooled to 0 deg.C, and SOCl was slowly added to the reaction mixture2(2.6g, 22 mmol). The reaction mixture was allowed to stand at room temperature for more than 1h and then stirred at room temperature for 4 h. All volatiles were then removed under vacuum to give the crude product of formula v, which was used directly in the next step without purification.
Synthesis of a compound of formula vi:
Figure BDA0002675531170000152
the crude product of formula V from the previous step was dissolved in DCE (100mL), 6-cyanoindole (2.8g, 20mmol) was added followed by AlCl3(5.2g, 40 mmol). The reaction mixture was refluxed for 10h and cooled to room temperature and ice (100g) was added. The mixture was partitioned between DCM and water. The organic mixture was over MgSO4Drying, vacuum filtering, concentrating to obtain crude product, and purifying by flash column chromatography (n-hexane/ethyl acetate 4/1 eluent). The target compound of the formula VI is obtained as a yellow solid. Yield: 5.2g, 59% (based on compound IV).1H NMR(400MHz,CDCl3) 11.69(s,1H),8.71(s,1H),8.11(d,J=7.5Hz,1H),7.78(s, 1H),7.58(s,1H),7.53(d,J=7.5Hz,1H),7.36(d,J=7.5Hz, 1H),6.92(d,J=7.5Hz,1H),3.57(t,J=7.1Hz,4H),3.03-3.16 (m,4H),2.56-2.64(m,3H),2.48(t,J=7.1Hz,4H),1.65-1.73 (m,2H),1.40-1.47(m,2H),1.12(t,J=8.0Hz,3H)。13C NMR (100MHz,CDCl3)196.3,149.3,136.2,130.6129.5,127.8, 125.9,125.2,124.5,123.7,123.4,119.5,118.6,114.3,108.5, 99.5,70.4,67.0,52.4,52.0,51.5,28.1,23.7,14.5. Calculation of C by ESI-TOF-HRMS27H30N4NaO2(M + Na)465.2266 molecular weight, found 465.2234.
Using AlCl3And CoCl3Synthesizing the eritinib:
Figure BDA0002675531170000161
stirring a mixture of formula VI (4.4g, 10mmol) and acetone (20mL), adding AlCl3(2.6g, 20mmol) and CoCl3(0.33g, 2 mmol). The stirred mixture was sealed and kept at 100 ℃ for 4h, then cooled to room temperature. DCM (100mL) was then added and the resulting mixture stirred for an additional 0.5h before ice (50g) was added. The mixture was partitioned between DCM and water. The organic mixture was over MgSO4Dried and concentrated by vacuum filtration to give the crude product which is recrystallized from hot MeOH (50 mL). The pure product was a non-white solid. Yield: 3.2 g, 67%.
1H NMR(400MHz,DMSO)12.46(s,1H),8.21(d,J=8.2Hz, 1H),8.05(d,J=2.5Hz,1H),7.78(d,J=2.0Hz,1H),7.53 (dd,J=8.1,1.8Hz,1H),7.32(s,1H),3.92(s,4H),3.42(b, 4H),3.19(b,1H),2.98(m,J=10.9Hz,4H),2.72(q,J=7.6 Hz,2H),1.82(s,4H),1.69(d,J=45.9Hz,6H),1.24(t,J= 7.6Hz,3H)。13C NMR (100MHz, DMSO)179.73,150.81,150.01, 146.65,142.65,136.73,132..31,131.85,127.16,124.91, 122.10,120.50,116.91,11.89,105.11,100.10,76.81,72.41, 66.81, 66.41,36.65,30.47,28.22,27.92, 15.92; calculation of C by ESI-TOF-HRMS30H35N4O2(M + H)483.2755 molecular weight, found 483.2728.
With MgCl2And CrCl3Synthesizing the eritinib:
Figure BDA0002675531170000171
stirring a mixture of formula VI (4.4g, 10mmol) and acetone (20mL), adding MgCl2(1.9g, 20mmol) and CrCl3(0.32g, 2 mmol). The stirred mixture was sealed and kept at 100 ℃ for 4h, then cooled to room temperature. DCM (100mL) was then added and the resulting mixture stirred for an additional 0.5h before ice (50g) was added. The mixture was partitioned between DCM and water. The organic mixture was over MgSO4Dried and concentrated by vacuum filtration to give the crude product which is recrystallized from hot MeOH (50 mL). The pure product was a non-white solid. Yield: 3.0 g, 63%.
By using
Figure BDA0002675531170000173
Molecular sieves and Co (NO)3)3Synthesizing the eritinib:
Figure BDA0002675531170000172
a mixture of formula VI (4.4g, 10mmol) and acetone (20mL) was stirred and added
Figure BDA0002675531170000174
Molecular sieves (5g) and Co (NO)3)3(0.48g, 2 mmol). The stirred mixture was sealed and kept at 100 ℃ for 4h, then cooled to room temperature. DCM (100mL) was then added and the resulting mixture stirred for an additional 0.5h before ice (50g) was added. The mixture was partitioned between DCM and water. The organic mixture was over MgSO4Dried and concentrated by vacuum filtration to give the crude product which is recrystallized from hot MeOH (50 mL). The pure product was a non-white solid. Yield: 3.3g, 69%.

Claims (10)

1. A method for preparing eritinib of formula I or a pharmaceutically acceptable salt thereof,
Figure FDA0002675531160000011
the method is characterized by comprising the following steps:
(a) reacting a compound of formula II with 4- (4-piperidinyl) morpholine in the presence of a base, a copper catalyst and a ligand to form a compound of formula III,
Figure FDA0002675531160000012
wherein X is selected from Cl, Br, I, OSO2Ar and OSO2CF3;R1Is alkyl, preferably CH, CH2CH3Or C (CH)3)3
(b) By CH3CH2Reacting Y with a compound of formula III in the presence of a catalyst to form a compound of formula IV,
Figure FDA0002675531160000013
wherein Y is selected from Cl, Br and I;
(c) hydrolysis of the compound of formula IV to the corresponding carboxylic acid, followed by SOCl2、PCl5Or POCl3Convert it intoA compound of the formula V,
Figure FDA0002675531160000021
(d) reacting 6-cyanoindole with a compound of formula V in the presence of a catalyst to form a compound of formula VI,
Figure FDA0002675531160000022
(e) reacting a compound of formula VI with acetone in the presence of a dehydrating agent selected from MgCl and a catalyst to form eritinib2、AlCl3、CaCl2
Figure FDA0002675531160000023
Molecular sieves and silica gel; the catalyst is selected from salts and/or complexes of chromium and cobalt.
2. The process of claim 1, wherein in each step the intermediates of formulae iii, iv, v and vi are isolated and then subjected to the next reaction, or the next reaction is carried out without isolation, or the entire reaction is carried out as a one-pot reaction.
3. The process of claim 1, wherein the ligand of step (a) is selected from the group consisting of compounds of formula VII,
Figure FDA0002675531160000024
wherein R is2Selected from alkyl, substituted/unsubstituted aryl; r2Preferably selected from methyl, ethyl, propyl, isopropyl, tert-butyl and substituted/unsubstituted anthracenyl, fluorenyl, indenyl, naphthyl and phenyl.
4. A process according to claim 3, wherein the ligand compound of formula vii is selected from one or more of the following compounds:
Figure FDA0002675531160000031
5. the method of claim 1, wherein the base of step (a) is selected from the group consisting of: TEA, DBU, DIPEA, KOH, K2CO3、NaOH、Na2CO3、Cs2CO3、CsOH、K3PO4、K2HPO4、Na3PO4And Na2HPO4
6. The method of claim 1, wherein the copper catalyst of step (a) is selected from the group consisting of CuI, CuCl, CuBr, Cu2O、Cu(acac)2、CuCl2、CuBr2、CuI2、Cu(OAc)2、Cu(OTf)2、Cu(ClO4)2And CuSO4
7. The process of claim 1, wherein the catalyst of step (b) is selected from lewis acids, preferably AlCl3、BeCl2、CdCl2、BF3、BBr3、GaCl3、AlBr3、FeCl3、TiCl4、SnCl4、SbCl5Lanthanide trihalides and alkylaluminum halides.
8. The process of claim 1, wherein the catalyst of step (d) is selected from lewis acids, preferably AlCl3、AlBr3Lanthanide-series trifluoride, zeolite, protonic acid, FeCl3,ZnCl2And polyphosphoric acid.
9. The process of claim 1 wherein step (e) said catalyst is selected from the group consisting of chromium and cobaltSalts and/or complexes, preferably CrCl3,CrF3,CrBr3,Cr(NO3)3,CoCl3,CoF3,CoBr3、Co(NO3)3
10. A process as claimed in any one of claims 2 to 4, wherein the ligand compound of formula VII is prepared by reacting a substituted aldehyde, oxalyl hydrazine and ammonia acetate:
Figure FDA0002675531160000041
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