Disclosure of Invention
The invention provides a novel process for synthesizing Olaparib, which is characterized by comprising the following steps:
in an organic solvent, the compound of the formula I, piperazine and cyclopropanecarboxylic acid react under the action of acyl chloride and organic alkali to obtain the Olaparib.
The organic solvent is selected from one or more of dichloromethane, ethanol, THF and DMF; the acyl chloride is selected from trimethyl acetyl chloride, oxalyl chloride and SOCl 2 One of the following; the organic base is selected from one of triethylamine and pyridine. The above reaction is preferably carried out with the addition of a catalytic amount of DMAP (4-dimethylaminopyridine).
The invention provides a novel process for synthesizing Olaparib, which is characterized by comprising the following steps:
(1) Dissolving a compound shown in the formula I in dichloromethane, adding trimethyl acetyl chloride and triethylamine, and stirring for 10-15min at room temperature to obtain a mixed solution A;
(2) Dissolving cyclopropanecarboxylic acid in dichloromethane, adding trimethyl acetyl chloride and triethylamine, and stirring at room temperature for 15-20min to obtain a mixed solution B;
(3) Dissolving piperazine in dichloromethane, stirring at room temperature, simultaneously dropwise adding the mixed solution A and the mixed solution B, and continuing stirring at room temperature for reaction after the dropwise adding is finished to obtain the Olaparib.
The molar ratio of the compound of the formula I to the trimethylacetyl chloride in the step (1) is 1:1-1.5, preferably 1:1, and the triethylamine is 2-3 times of the trimethylacetyl chloride;
the molar ratio of cyclopropanecarboxylic acid to trimethylacetyl chloride in the step (2) is 1:1.2-1.5, preferably 1:1.2, and the amount of triethylamine is 2-3 times that of trimethylacetyl chloride;
the molar amount of the compound of formula I, cyclopropanecarboxylic acid and piperazine is 1:1:1-1.2, preferably 1:1:1.
The dropping speed of the mixed solution A in the step (3) is selected from 5-6ml/min; the drop velocity of the mixed solution B is 1.5-2.5 times, preferably 1.8-2.0 times of the drop velocity of the mixed solution A. In step (3) a catalytic amount of DMAP (4-dimethylaminopyridine) is preferably added, the molar amount of DMAP being preferably from 0.05 to 0.1 times that of the compound of formula I.
The amount of the organic solvent used in the steps (1), (2) and (3) of the present invention is preferably such that the reactants are sufficiently dissolved, and it is preferable to use an equal volume of methylene chloride in the steps (1) and (2).
Stopping the reaction when TLC detects the disappearance of the raw materials in the reaction time of the step (3); preferably the reaction time is 3-5 hours.
The novel process for synthesizing the olaparib optionally comprises the following step (4): washing the reaction solution in the step (3) with dilute hydrochloric acid, saturated sodium bicarbonate and saturated sodium chloride in sequence, concentrating a dichloromethane phase under reduced pressure, and recrystallizing with ethyl acetate to obtain the pure Olaparib product. The concentration of the dilute hydrochloric acid is 1-4mol/L.
The HPLC purity of the pure Olaparib product is more than 99 percent, preferably more than 99.6 percent.
Compared with the prior art, the invention has the advantages that: (1) The synthesis process does not need to protect piperazine amino, and two carboxylic acids are directly reacted with piperazine with two amino groups exposed at the same time after being activated to construct a diacyl piperazine group; (2) The HPLC purity of the pure Olaparib product prepared by the method is more than 99 percent, preferably more than 99.6 percent.
Detailed Description
The examples provided below are presented in more detail to facilitate a further understanding of the present invention. These examples are provided only for better understanding of the present invention and are not intended to limit the scope or practice of the present invention, and the embodiments of the present invention are not limited to the following.
Example 1
(1) Dissolving a compound (1 mmol) of the formula I in dichloromethane (15 mL), adding trimethylacetyl chloride (1 mmol) and triethylamine (2 mmol), and stirring at room temperature for 15min to obtain a mixed solution A;
(2) Cyclopropanecarboxylic acid (1 mmol) was dissolved in dichloromethane (15 mL), and trimethylacetyl chloride (1.2 mmol) and triethylamine (2.4 mmol) were added thereto, followed by stirring at room temperature for 20min to obtain a mixed solution B;
(3) Dissolving piperazine (1 mmol) in dichloromethane (30 mL), stirring at room temperature, simultaneously dropwise adding mixed solution A and mixed solution B (the dropwise adding speed of mixed solution A is 5mL/min, the dropwise adding speed of mixed solution B is 2.0 times of the dropwise adding speed of mixed solution A), adding catalytic amount of DMAP (0.1 mmol) after dropwise adding, continuing stirring at room temperature for reaction until TLC detection reaction is complete (about 3 hours), washing the reaction solution sequentially with dilute hydrochloric acid (1M), saturated sodium bicarbonate and saturated sodium chloride, concentrating the dichloromethane phase under reduced pressure, and recrystallizing with ethyl acetate to obtain pure Olaparib (328.2 mg, yield about 75.5%) (which is tested by NMR 1 H NMR、 13 The C NMR data are consistent with known reports with an HPLC purity of 99.61%, see FIG. 1).
Example 2
(1) Dissolving a compound (1 mmol) of the formula I in dichloromethane (20 mL), adding trimethylacetyl chloride (1.5 mmol) and triethylamine (4.5 mmol), and stirring at room temperature for 10min to obtain a mixed solution A;
(2) Cyclopropanecarboxylic acid (1 mmol) was dissolved in dichloromethane (20 mL), and trimethylacetyl chloride (1.5 mmol) and triethylamine (4.5 mmol) were added thereto, followed by stirring at room temperature for 15min to obtain a mixed solution B;
(3) Piperazine (1.2 mmol) was dissolved in dichloromethane (40 mL), mixed solution a and mixed solution B (mixed solution a has a dropping speed of 5mL/min; mixed solution B has a dropping speed of 1.8 times that of mixed solution a) were simultaneously added dropwise while stirring at room temperature, stirring at room temperature was continued after the addition was completed until the reaction was stopped (about 5 hours) after the TLC detection was completed, the reaction solution was washed with dilute hydrochloric acid (1M), saturated sodium bicarbonate and saturated sodium chloride in this order, and after concentrating the dichloromethane phase under reduced pressure, the pure olaparib (254.6 mg, yield about 58.6%) was obtained by recrystallization with ethyl acetate (HPLC detection was consistent with that of the olaparib product prepared in example 1, HPLC purity was 99.53%).
Example 3
(1) Dissolving a compound (1 mmol) of the formula I in dichloromethane (15 mL), adding oxalyl chloride (1 mmol) and triethylamine (2 mmol), and stirring at room temperature for 15min to obtain a mixed solution A;
(2) Cyclopropanecarboxylic acid (1 mmol) was dissolved in dichloromethane (15 mL), oxalyl chloride (1.2 mmol) and triethylamine (2.4 mmol) were added, and after stirring at room temperature for 20min, a mixture B was obtained;
(3) Piperazine (1 mmol) was dissolved in dichloromethane (30 mL), mixed solution a and mixed solution B (mixed solution a has a dropping speed of 5mL/min; mixed solution B has a dropping speed of 2.0 times that of mixed solution a) were added at the same time while stirring at room temperature, after the completion of the dropping, a catalytic amount of DMAP (0.1 mmol) was added, and after continuing the stirring reaction at room temperature for 3 hours, TLC detects the disappearance of the raw material of formula I, but the reaction system was complicated, the reaction was stopped, the reaction solution was washed with dilute hydrochloric acid (1M), saturated sodium bicarbonate and saturated sodium chloride in sequence, and after concentrating the dichloromethane phase under reduced pressure, the olaparib (81.3 mg, yield about 18.7%) was obtained by silica gel column chromatography (HPLC detection was consistent with the olaparib product prepared in example 1, HPLC purity was 96.25%).
Example 4
(1) The compound of formula I (1 mmol) was dissolved in dichloromethane (20 mL) and SOCl was added 2 (1.5 mmol) and triethylamine (4.5 mmol), and stirring at room temperature for 15min to obtain a mixed solution A;
(2) Cyclopropanecarboxylic acid (1 mmol) was dissolved in dichloromethane (20 mL) and SOCl was added 2 (1.5 mmol) and triethylamine (4.5 mmol), and stirring at room temperature for 20min to obtain a mixed solution B;
(3) Piperazine (1.2 mmol) was dissolved in dichloromethane (40 mL), mixed solution a and mixed solution B (mixed solution a has a dropping speed of 6mL/min; mixed solution B has a dropping speed of 1.8 times that of mixed solution a) were simultaneously added dropwise while stirring at room temperature, after the addition was completed, stirring at room temperature was continued for 5 hours, TLC was performed to detect disappearance of the raw material of formula I, but the reaction system was complicated, the reaction was stopped, the reaction solution was washed with dilute hydrochloric acid (1M), saturated sodium bicarbonate and saturated sodium chloride in this order, and after concentrating the dichloromethane phase under reduced pressure, the olapanib (36.4 mg, yield about 8.4%) was obtained by silica gel column chromatography (HPLC detection was consistent with the olapanib product prepared in example 1, HPLC purity was 96.32%).
Example 5
(1) Dissolving a compound (1 mmol) of the formula I in dichloromethane (15 mL), adding trimethylacetyl chloride (1 mmol) and triethylamine (2 mmol), and stirring at room temperature for 15min to obtain a mixed solution A;
(2) Cyclopropanecarboxylic acid (1 mmol) was dissolved in dichloromethane (15 mL), and trimethylacetyl chloride (1.2 mmol) and triethylamine (2.4 mmol) were added thereto, followed by stirring at room temperature for 20min to obtain a mixed solution B;
(3) Piperazine (1 mmol) was dissolved in dichloromethane (30 mL), mixed solution a and mixed solution B (mixed solution a has a dropping speed of 5mL/min; mixed solution B has a dropping speed of 5 mL/min) were added simultaneously while stirring at room temperature, after the addition, a catalytic amount of DMAP (0.1 mmol) was added and stirring at room temperature was continued for 3 hours, TLC was performed to detect disappearance of the starting material of formula I, but the reaction system was complicated, the reaction was stopped, the reaction solution was washed with dilute hydrochloric acid (1M), saturated sodium bicarbonate and saturated sodium chloride in this order, and after concentrating the dichloromethane phase under reduced pressure, the olaparib (192.3 mg, yield about 44.3%) was obtained by separation through silica gel column chromatography (HPLC detection was identical to that of the olaparib product prepared in example 1, HPLC purity was 97.82%).
Example 6
The compound of formula I (1 mmol) and cyclopropanecarboxylic acid (1 mmol) were dissolved in dichloromethane (30 mL), trimethylacetyl chloride (2.2 mmol) and triethylamine (4.4 mmol) were added, after stirring at room temperature for 20min, piperazine (1 mmol) and a catalytic amount of DMAP (0.1 mmol) were added, and after continuing stirring at room temperature for 3 hours, TLC detection showed that the reaction system was more complicated and that no Olaparib was found (no corresponding Olaparib spot on TLC plate).