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Preparation method of ramelteon

A technology of ethylamine and compounds, applied in the field of medicinal chemistry, can solve the problems of low total reaction yield and many reaction steps, and achieve the effect of simple operation, single type and high yield

Inactive Publication Date: 2020-05-19
BEIJING VENTUREPHARM BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional preparation process of ramelteon, the existence of chiral resolution steps leads to low overall yield of reaction and more reaction steps

Method used

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  • Preparation method of ramelteon
  • Preparation method of ramelteon
  • Preparation method of ramelteon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 100.00 g of 1,6,7,8-tetrahydro-8H-indeno[5,4-b]furan-8-one, 122.03 g of diethyl cyanomethylphosphonate, and 130.27 g of sodium methoxide. Keep the temperature at 35 °C, stir for 12 h, then add 2 L of water, stir for 4 h, then filter, wash the filter cake with 200 ml of water, and dry at 50 °C for 24 h. 98 g of white solid was obtained.

[0036] 90.00 g of the white solid obtained above was dispersed by adding 540 ml of methanol, and [Et 2 NH 2 ] + [Ru 2 Cl 5 (BINAP) 2 ] - 1.66 g. After the addition, pass hydrogen to 5 MPa and stir at 50 °C for 20 h. TLC detects that the reaction is complete. After the reaction is complete, the solvent is spin-dried, and then 450 ml of n-heptane is used for slurry, and then filtered. The solid cake is collected and dried at 50 °C for 1 h. In 270 ml of ethyl acetate and 270 ml of n-heptane, dissolved at 50 °C and then crystallized at 0 °C to obtain 90.15 g of yellow oil. The purity of the final product by HPLC was 98.5%.

Embodiment 2

[0038] Weigh 100.00 g of 1,6,7,8-tetrahydro-8H-indeno[5,4-b]furan-8-one, 122.03 g of diethyl cyanomethylphosphonate, and 130.27 g of sodium methoxide. Keep the temperature at 35 °C, stir for 12 h, then add 2 L of water, stir for 4 h, then filter, wash the filter cake with 200 ml of water, and dry at 50 °C for 24 h. 98 g of white solid was obtained.

[0039] 90.00 g of the white solid obtained above was dispersed by adding 540 ml of methanol, and [Ru (BINAP) (OCOCH 3 ) 2 ] 0.86 g, after the addition, pass hydrogen to 5 MPa and stir at 50 °C for 20 h, and the reaction is complete as detected by TLC. Spin to dry the solvent, then beat with 450 ml of n-heptane, then filter, collect the filter cake solids and dry at 50 °C for 1 h, then place in 270 ml of ethyl acetate and 270 ml of n-heptane, dissolve at 50 °C and crystallize at 0 °C 90.15 g of yellow oil were obtained. The purity of the final product by HPLC was 95.3%.

Embodiment 3

[0041] Weigh 100.00 g of 1,6,7,8-tetrahydro-8H-indeno[5,4-b]furan-8-one, 122.03 g of diethyl cyanomethylphosphonate, and 130.27 g of sodium methoxide. Keep the temperature at 35 °C, stir for 12 h, then add 2 L of water, stir for 4 h, then filter, wash the filter cake with 200 ml of water, and dry at 50 °C for 24 h. 98 g of white solid was obtained.

[0042] 90.00 g of the white solid obtained above was dispersed by adding 540 ml of methanol, and [RuCl(BINAP)( p -cymene)]Cl 1.26 g, after the addition was completed, pass hydrogen to 5 MPa and stir at 50 °C for 20 h, and TLC detected that the reaction was complete. Spin to dry the solvent, then beat with 450 ml of n-heptane, then filter, collect the filter cake solids and dry at 50 °C for 1 h, then place in 270 ml of ethyl acetate and 270 ml of n-heptane, dissolve at 50 °C and crystallize at 0 °C 90.15 g of yellow oil were obtained. The purity of the final product by HPLC was 96.2%.

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Abstract

The invention belongs to the field of medicinal chemistry, and mainly relates to a (S)-2-(1,6,7,8-tetrahydro-2H-indeno[5,4-b]furan-8-yl)-1-ethylamine compound represented by a formula I. The method has the advantages that the operation is simple, the steps are reduced compared with the previous method, the route is shortened, and the used solvent is single in variety, convenient to recycle and high in yield, wherein the formula I is defined in the specification.

Description

technical field [0001] The present invention belongs to the field of medicinal chemistry and mainly relates to (S)-2-(1,6,7,8-tetrahydro-2H-indeno[5,4-b]furan-8-yl)- Process for the preparation of 1-ethylamine. Background technique [0002] Ramelteon (Ⅱ) (ramelteon,2), the chemical name is (S)-N-[2-(1,2,6,7-tetrahydro-8H-indeno[5,4-b]furan- 8-yl)] propionamide, developed by Japan's Takeda Company, was approved by the US FDA in September 2005. This product is a melatonin receptor agonist, which can simulate the physiological effects of melatonin secreted by the pineal gland, which helps to regulate the sleep cycle and improve sleep quality. Drugs for the treatment of insomnia. [0003] [0004] II [0005] Currently in the process of preparing ramelteon, often ( E )-2-(1,2,6,7-tetrahydro-8H-indeno[5,4-b]furan-8-ylidene)acetonitrile was first prepared by catalytic hydrogenation into a racemate, and then manually (S)-2-(1,6,7,8-tetrahydro-2H-indeno[5,4-b]furan-8-yl)-1-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/77
CPCC07D307/77
Inventor 海楠李恩民赵国磊
Owner BEIJING VENTUREPHARM BIOTECH
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