Novel synthesis process of N-benzyl-3-piperidinol, novel nickel-based catalyst and preparation method thereof

A technology of nickel-based catalyst and piperidinol, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the requirement of reducing hydrogen pressure, and the cost is difficult to reduce , high cost of noble metal catalysts, etc., to achieve the effects of lower pressure resistance requirements, lower production costs, and significant economic and social benefits

Inactive Publication Date: 2010-09-01
ANHUI SHENGDONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] This approach is the general technique of producing N-benzyl-3-piperidinol both at home and abroad at present, and the producer that uses is more, because it has taken noble metal catalysts such as platinum dioxide, platinum carbon, rhodium carbon, greatly reduces for Requirements for

Method used

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  • Novel synthesis process of N-benzyl-3-piperidinol, novel nickel-based catalyst and preparation method thereof
  • Novel synthesis process of N-benzyl-3-piperidinol, novel nickel-based catalyst and preparation method thereof
  • Novel synthesis process of N-benzyl-3-piperidinol, novel nickel-based catalyst and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0047] Prepare new nickel-based catalyst as follows:

[0048] (1) 700g of diatomaceous earth is added into a three-necked round bottom flask with a capacity of 20L;

[0049] (2) 1250ml of 95% ethanol, 290g of nickel acetate, and 84.25g of cobalt chloride were also added to the aforementioned three-necked round-bottomed flask, fully dissolved, and soaked overnight;

[0050] (3) Slowly add 80 g of sodium borohydride solution (0.2 mol / L) under vigorous stirring, and fully react until no bubbles are released;

[0051] (4) After completion of the reaction, add 4L of water and filter with suction to obtain about 850g of the new nickel-based catalyst (the active ingredient in which is about 150g);

[0052] (5) Wash the new nickel-based catalyst for 3 to 5 times, wash each time with 1000 ml of water, drain and store in 95% ethanol for later use.

Embodiment 2

[0054] Prepare N-benzyl-3-piperidinol as follows:

[0055] (1) Add 95g of 3-hydroxypiperidine and 500mL of toluene into a three-neck round bottom bottle equipped with mechanical stirring, thermometer, and constant pressure dropping funnel, and heat to 90°C;

[0056] (2) After the 3-hydroxypyridine is completely dissolved in toluene, 130 g of benzyl chloride is slowly added dropwise therein, and the dropwise addition is completed within 30 minutes;

[0057] (3) Keep at 90°C and react for 2 hours;

[0058] (4) stop heating, continue to stir and cool to room temperature, separate out a large amount of white solids;

[0059] (5) filter the separated white solid to obtain the quaternary ammonium salt of N-benzyl-3-hydroxypyridine, and wash the filter cake once with toluene 200mL;

[0060] (6) The quaternary ammonium salt of the washed N-benzyl-3-hydroxypyridine is added to the hydrogenation kettle, and 500 mL of absolute ethanol, 101 g of triethylamine, and 30 g of the new nickel...

Embodiment 3

[0070] Prepare N-benzyl-3-piperidinol according to the following method:

[0071] (1) Add 1.9Kg of 3-hydroxypiperidine and 10L of toluene into a 20L enamel reaction kettle equipped with mechanical stirring, enamel disk condenser, thermometer and metering pump, and heat to 110°C;

[0072] (2) After the 3-hydroxypyridine is completely dissolved in toluene, 2.6Kg of benzyl chloride is slowly added dropwise therein, and the dropwise addition is completed within 30 minutes;

[0073] (3) Keep at 110°C and react for 2 hours;

[0074] (4) stop heating, continue to stir and cool to room temperature, separate out a large amount of white solids;

[0075] (5) filter the separated white solid to obtain the quaternary ammonium salt of N-benzyl-3-hydroxypyridine, and wash the filter cake once with 4L of toluene;

[0076] (6) The quaternary ammonium salt of the washed N-benzyl-3-hydroxypyridine is added in a 20L hydrogenation kettle, and 600g of the new nickel-based catalyst of 10L of dehyd...

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Abstract

The invention discloses a synthesis process of N-benzyl-3-piperidinol which is the most important midbody for synthesizing Benidipine. The synthesis process comprises the following steps of: taking 3-hydroxy pyridine as a raw material, firstly performing the reaction with benzyl chloride to generate quaternary ammonium salt of N-benzyl-3-hydroxy pyridine, then carrying out catalytic reduction on the quaternary ammonium salt under the moderate hydrogen pressure (3 to 5atm) by using a nickel-based catalyst which is low in cost and easy to be prepared so as to obtain the N-benzyl-3-piperidinol. The invention also discloses a formula and a preparation method of the nickel-based catalyst used in the synthesis process of the N-benzyl-3-piperidinol. The invention has the advantages of low cost, safe operation, high product purity, and the like and is a synthesis route of the N-benzyl-3-piperidinol which is environment-friendly and suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of N-benzyl-3-piperidinol, in particular to a new synthesis process of N-benzyl-3-piperidinol, a new nickel-based catalyst and a preparation method. Background technique [0002] Since the 1980s, the incidence of hypertension in my country has continued to rise. According to the statistics of the health department, the number of hypertensive patients in my country has reached 1% of the total population. Accordingly, the market share of antihypertensive drugs has also increased sharply year by year. my country's antihypertensive drug market is basically dominated by three major categories of drugs: dipine, sartan and prix. Among them, the antihypertensive drugs of the dipine type are the most popular among patients, because of their cheap price and definite curative effect, they can be the most popular medicine for the vast number of middle-aged people in my country. accepted by low-income groups. [0003] B...

Claims

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Application Information

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IPC IPC(8): C07D211/42C07D211/02B01J23/755
Inventor 刘前
Owner ANHUI SHENGDONG CHEM
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