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Preparation method of N-(2- indanyl) amino acid alkyl ester

A technology of glycine alkyl ester and ethyl acetate, which is applied in the field of N-amino acid alkyl ester preparation, can solve problems such as low yield, environmental pollution by by-products, etc., and achieve the effect of avoiding toxic substances

Active Publication Date: 2012-03-28
广东暨大基因药物工程研究中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of N-(2-indanyl) glycine alkyl ester preparation method, to solve the technical problems of low yield and environmental pollution by by-products

Method used

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  • Preparation method of N-(2- indanyl) amino acid alkyl ester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Mix 5.27g glycine methyl ester hydrochloride (0.042mol), 9.62g sodium triacetoxyborohydride (0.046mol), 2.17ml glacial acetic acid (0.038mol), 90ml 1,2-dichloroethane, stir and mix Evenly, cool in an ice bath to 5°C;

[0033] 2) Add 5 g of 2-indanone (0.038 mol) dissolved in 10 ml of 1,2-dichloroethane dropwise, about 25 minutes after the drop. React at 10°C for 40min (until no bubbles are generated in the system), transfer to room temperature and react at 30°C for 3h, and detect the end point by TLC.

[0034] 3) After the reaction, the solvent was removed under reduced pressure, 50ml of water was added under stirring, and 20% H 3 PO 4 50ml was adjusted to pH=2-3.

[0035] 4) Extract with toluene four times (25×4ml), under cooling, slowly add sodium carbonate to the water layer while stirring to adjust the pH to 7-8, extract with chloroform, anhydrous Na 2 SO 4 Dry, remove the solvent under reduced pressure to obtain the extract;

[0036] 5) This material was ...

Embodiment 2

[0038] 1) Mix 13.95g tert-butyl glycine hydrochloride (0.083mol), 4.33ml glacial acetic acid (0.076mol), 19.24g sodium triacetoxy borohydride (0.0908mol), 200ml of 1,2-dichloroethane , cooled to 5°C in an ice bath;

[0039] 2) 10g (0.076mol) 2-indanone 30ml, 1,2-dichloroethane solution was added dropwise under stirring, reacted at 10°C for 1h, transferred to room temperature at 30°C for 1h, and detected the end point by TLC.

[0040] 3) After the reaction is completed, the solvent is removed under reduced pressure, and 100ml of water is added under stirring, and 20% H 3 PO 4 100ml was adjusted to pH=2-3.

[0041] 4) Extract four times with toluene (50×4ml). Under cooling, slowly add sodium carbonate to the water layer while stirring to adjust the pH to 7-8. During the addition of sodium carbonate, a precipitate precipitates, vacuum-filter, and vacuum-dry After obtaining a solid;

[0042] 5) Recrystallized with ethanol / water (3 / 1) to obtain 14.11 g of white crystals, the y...

Embodiment 3

[0044] 1) Mix 13.95g tert-butyl glycine hydrochloride (0.083mol), 19.24g sodium triacetoxyborohydride (0.0908mol), 200ml 1,2-dichloroethane, and cool to 5°C in an ice bath;

[0045] 2) Add 10 g (0.076 mol) of 2-indanone in 30 ml of 1,2-dichloroethane dropwise under stirring, react at 10°C for 1 hour, turn to room temperature and react at 30°C for 1 hour, and check the end point by TLC.

[0046] 3) After the reaction is completed, the solvent is removed under reduced pressure, and 100ml of water is added under stirring, and 20% H 3 P0 4 100ml was adjusted to pH=2-3.

[0047] 4) Extract four times with toluene (50×4ml). Under cooling, slowly add sodium carbonate to the water layer while stirring to adjust the pH to 7-8. During the addition of sodium carbonate, a precipitate precipitates, vacuum-filter, and vacuum-dry After obtaining a solid;

[0048] 5) Recrystallized with ethanol / water (3 / 1) to obtain 13.69 g of white crystals, the yield of N-(2-indanyl)glycine tert-butyl e...

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Abstract

The invention provides a preparation method for N-(2- indanyl) glycine alkyl ester. An N-(2- indanyl) glycine alkyl ester crude product is obtained through the reaction of glycine alkyl ester and 2-indenone, and the reducer used in the reaction of the glycine alkyl ester and 2-indenone is triacetyl oxygroup sodium boro-hydride; and the molar ratio of 2-indenone and triacetyl oxygroup sodium boro-hydride is 1 to 0.79 to 1.59. By adopting the method, NaBH (OAc) 3 is used for preventing the use of NaBH3CN, the production of toxic substance is avoided, and the yield of the prepared N-(2- indanyl) glycine alkyl ester can reach 77.2 percent.

Description

technical field [0001] The invention relates to the field of preparation of delapril hydrochloride intermediates, in particular to a preparation method of N-(2-indanyl) acid alkyl ester. Background technique [0002] N-(2-indanyl) glycine alkyl ester is an intermediate in the synthesis of a new type of angiotensin-converting enzyme inhibitor, delapril hydrochloride. The synthetic route that adopts in the prior art is: [0003] [0004] Current reducing agent NaBH 3 Both HCN and NaCN, the by-products of CN reduction, are highly toxic and not conducive to environmental protection, and the yield is only 60%. Contents of the invention [0005] The purpose of the present invention is to provide a kind of preparation method of N-(2-indanyl) glycine alkyl ester, to solve the technical problems of low yield and environmental pollution by by-products. [0006] In order to achieve the above object, the present invention provides a method for preparing N-(2-indanyl) glycine alk...

Claims

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Application Information

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IPC IPC(8): C07C229/14C07C227/18
Inventor 张庆华
Owner 广东暨大基因药物工程研究中心有限公司
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