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Preparation method of sitagliptin

A sitagliptin and compound technology, which is applied in the field of drug synthesis, can solve the problems of low product yield, multiple reaction selectivity of coupling by-products, and high production cost, achieve high purity, improve atom utilization, and reduce workload Effect

Inactive Publication Date: 2019-12-17
NANJING CHICO PHARMA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Purpose of the invention: the technical problem to be solved by this invention is to provide a kind of sitagliptin for the defects of low product yield, high production cost and poor selectivity of multiple reactions of coupling by-products in the method for preparing sitagliptin in the prior art. Tin preparation method

Method used

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  • Preparation method of sitagliptin
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  • Preparation method of sitagliptin

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Embodiment 1: the synthesis of compound II

[0060]

[0061] 22.8g (100mmol) of compound I, 31.2g (200mmol) of bromoacetyl chloride (200mmol) and 65.2g (200mmol) of cesium carbonate were added to a flask at room temperature, stirred and mixed in 100mL DMF at room temperature for 3h; after the reaction was completed, extracted with ethyl acetate , the organic phase was concentrated, washed with water, recrystallized from ethanol, and dried to obtain 28.4 g of compound II with a yield of 91%. Compound II: 1 HNMR (400MHz, DMSO-d 6 )δ4.46(s, 2H), 4.26(t, J=5.3Hz, 2H), 4.19(s, 2H), 3.68(t, J=5.3Hz, 2H). 13 C NMR (100MHz, DMSO-d 6 )δ170.00, 144.30, 144.26, 130.78, 130.46, 121.56, 118.88, 45.96, 42.99, 42.71, 42.69, 27.67. HRMS (ESI-TOF) m / z Calcd for C 8 h 8 BrN 4 f 3 O[M+H] + : 312.9906, found: 312.9910.

Embodiment 2

[0062] Embodiment 2: the synthesis of compound IV

[0063]

[0064] Add 16g (100mmol) of compound III, 15.3g (150mmol) of acetic anhydride and 15.2g (110mmol) of potassium carbonate into the flask at room temperature and react at 140°C for 12h. After the reaction is completed, cool to room temperature and concentrate in vacuo to obtain (E)- 3-(2,4,5-difluorophenyl) endenoic acid, yield 89%; Pd / C (10%) (1 equivalent) was mixed with the above-mentioned product in 50 mL of methanol at room temperature, and passed Enter H 2 (1atm) reacted at room temperature for 16h, and after the reaction was completed, concentrated in vacuo to obtain 3-(2,4,5-trifluorophenyl)propionic acid with a yield of 93%; at room temperature, the above-mentioned product was mixed with 30 mL of polyphosphoric acid Reacted at 80°C for 4 hours, cooled to room temperature after the reaction was completed, extracted with ethyl acetate, concentrated the organic phase, washed with water, recrystallized with et...

Embodiment 3

[0065] Embodiment 3: the synthesis of compound V

[0066]

[0067] Add 18.7g (60mmol) of compound II, 11.2g (60mmol) of compound IV and 6.1g (90mmol) of sodium ethoxide into a flask at room temperature, stir and mix in 80ml DMF for 3h at room temperature, after the reaction is completed, use NaHCO 3 Wash with saturated solution, extract with ethyl acetate, dry over anhydrous sodium sulfate, recrystallize from ethanol to obtain compound V23.3g, yield 93%. Compound V: 1 H NMR (400MHz, DMSO-d 6 )δ7.08(td, J=8.9, 5.7Hz, 1H), 5.18(d, J=13.5Hz, 1H), 4.92(d, J=13.6Hz, 1H), 4.57-4.25(m, 3H), 3.64(dd, J=12.4, 7.0Hz, 1H), 3.27(p, J=7.0Hz, 1H), 3.07-2.83(m, 2H), 2.60(dd, J=12.9, 7.0Hz, 1H), 2.48 (dd, J=12.4, 7.0Hz, 1H). 13 C NMR (100MHz, Common NMR Solvents) δ207.55-202.96(m), 174.79, 155.64(dd, J=8.3, 3.0Hz), 153.12(dd, J=7.9, 2.7Hz), 148.52(dd, J= 20.2, 8.0Hz), 147.33-145.21(m), 144.28(d, J=3.8Hz), 143.75(dd, J=19.8, 3.0Hz), 133.94(ddd, J=20.6, 8.0, 3.0Hz), 130.62 (q, J=32.0Hz...

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Abstract

The invention discloses a preparation method of sitagliptin. The preparation method comprises the following steps: (1) carrying out a substitution reaction on a compound as shown in a formula I and bromoacetyl chloride to obtain a compound as shown in a formula II; (2) carrying out a cyclization reaction on the compound as shown in the formula III under conditions (i, ii and iii) to obtain a compound as shown in a formula IV; (3) removing HBr coupling from the compound as shown in the formula II and the compound as shown in the formula IV under the action of an alkali to obtain a compound as shown in a formula V; (4) reacting the compound as shown in the formula V with hydroxylamine to form a compound VI with a ketoxime structure; (5) carrying out a Beckmann rearrangement reaction on the compound as shown in the formula VI under the action of an acid to obtain a compound VII; and (6) hydrolyzing the compound as shown in the formula VII and carrying out decarboxylating under a strong heat condition to obtain the compound X, i.e., sitagliptin. The method for preparing sitagliptin has simple steps, uses easily-available raw materials, and is greatly reduced in side reactions and greatly increased in yield.

Description

technical field [0001] The invention belongs to the field of drug synthesis and relates to a preparation method of sitagliptin. Background technique [0002] Sitagliptin is a new type of hypoglycemic drug developed by Merck and belongs to non-insulin therapeutic drugs. Sitagliptin is a dipeptidyl peptidase-4 (DPP-4) inhibitor that controls blood sugar levels by protecting endogenous incretins and enhancing their action. Glucose-dependent insulinotropic peptide (GIP) and glucagon fetal-1 (GLP-1), are incretins released in response to dietary intake. GLP-1 and GIP can increase insulin synthesis and release from pancreatic β cells through intracellular signaling pathways, and GLP-1 can also reduce the secretion of glucagon from pancreatic α cells and reduce hepatic glucose production. However, both GLP-1 and GIP are rapidly metabolized by DPP-4, resulting in the loss of their insulin-stimulating effects. This drug inhibits the degradation of incretins by DPP-4, so it can enh...

Claims

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Application Information

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IPC IPC(8): C07D487/04
CPCC07D487/04
Inventor 杨博陈耀
Owner NANJING CHICO PHARMA CO LTD