Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Process for the Preparation of 4-(Benzimidazolylmethylamino)-Benzamides and the Salts Thereof

Inactive Publication Date: 2007-08-09
BOEHRINGER INGELHEIM INT GMBH
View PDF5 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018] Surprisingly it has now been found that the substituted 4-(benzimidazol-2-ylmethylamino)-benzamidines can be produced in high yields and using inexpensive adjuvants if
[0023] It has also surprisingly been found that the salts of optionally substituted 4-(benzimidazol-2-ylmethylamino)-benzamidines can be prepared in high yields and using inexpensive adjuvants if

Problems solved by technology

This process is highly complex from the point of view of production technology and results in a high loading of acids that have to be disposed of.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process for the Preparation of 4-(Benzimidazolylmethylamino)-Benzamides and the Salts Thereof
  • Process for the Preparation of 4-(Benzimidazolylmethylamino)-Benzamides and the Salts Thereof
  • Process for the Preparation of 4-(Benzimidazolylmethylamino)-Benzamides and the Salts Thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of 2-[4-(1,2,4-oxadiazol-5-on-3-yl)-aniline (1)

Variant 1:

[0105] (1A)

[0106] In the reaction vessel are placed 118.6 g (1 mol) 4-aminobenzonitrile and 68.9 g (0.65 mol) sodium carbonate in 500 ml of ethanol and 100 ml of water and the mixture is heated to 60° C. 76.4 g (1.1 mol) hydroxylamine-hydrochloride, dissolved in 100 ml of water, are slowly added dropwise to this suspension.

[0107] The mixture is subsequently stirred overnight at 60° C. During cooling to 0-5° C. the substance is precipitated, filtered off and washed several times with a total of 150 ml cold water and 100 ml cold ethanol. Finally the mixture is washed with 50 ml MtBE and 178.4 g moist product are obtained. This is dried at 35° C. in vacuo.

[0108] Yield: 135.4 g light beige substance (89.5% of theory), melting point: from 169.5° C. (decomp.); purity: >98% HPLC peak area

[0109] (1B)

[0110] 25.02 g (0.46 mol) sodium methoxide are added batchwise to a suspension of 60.5 g (1A) (0.4 mol) in 400 ml of ...

example 2

Preparation of 2-[4-(1,2,4-oxadiazol-5-on-3-yl)-phenylamino]-acetic acid (2)

Variant 1:

[0119] (2A)

[0120] At ambient temperature 83.5 g (0.5 mol) ethyl bromoacetate are metered into a suspension of 70.86 g (0.4 mol) (1B) and 26.5 g (0.25 mol) sodium carbonate in 600 ml of water / isopropanol and stirred overnight. The reaction mixture is reddish-brown to orange. The suspension cooled to 0° C. is suction filtered, washed in several batches with 300 ml of water and 150 ml of ethanol (106 g moist light-brown substance) and dried at 35° C. in vacuo.

[0121] Yield: 92.44 g brownish substance (87.7% of theory) melting point: from 186.1° C. (decomp.); purity: >98% HPLC peak area

[0122] (2B)

[0123] The ester (2A) (86.9 g; 0.33 mol) thus obtained is suspended in 400 ml of water and at RT 120 g of 45% NaOH are slowly added dropwise. The suspension goes into solution and is reddish (pH 12.5). It is heated to 60° C. and saponified for 1 h. The solution obtained is combined batchwise with HCl (37...

example 3

Preparation of 3-amino-4-methylaminobenzoic acid-N-(2-pyridyl)-N-(2-ethoxycarbonylethyl)-amide (AMBPA) (3)

[0131]

Variant A: Pd / C 5%

[0132] 150 g (0.4 mol) 4-methylamino-3-nitrobenzoic acid-N-(2-pyridyl)-N-(2-ethoxycarbonylethyl)-amide, 12 g 5% palladium on charcoal catalyst and 627 ml of ethyl acetate are placed in a hydrogenating autoclave. The mixture is hydrogenated under a hydrogen atmosphere of 3-4 bar at 35-55° C. until the hydrogen uptake is constant (1-2 h). After cooling to 20° C. the hydrogenating solution is filtered off from the catalyst and evaporated down in vacuo using the rotary evaporator. The residue is taken up in 650 ml isopropanol, distilled down to half the original volume and cooled to 5-10° C. After 4 h the resulting suspension is filtered, and the precipitate thus isolated is washed batchwise with a total of 100 ml isopropanol. The solid obtained is dried in the vacuum dryer at 50° C.

[0133] Yield: 114.2 g (corr. 83% of theory)

Variant B: Pd / C 10%

[0134] 2...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a process for preparing an optionally substituted 4-benzimidazol-2-ylmethylamino)-benzamidine, characterised in that (a) an optionally correspondingly substituted diaminobenzene is condensed with 2-[4-(1,2,4-oxadiazol-5-on-3-yl)-phenylamino]-acetic acid, (b) i) the product thus obtained is hydrogenated and ii) optionally the amidino group is carbonylated, without isolating the intermediate product of the hydrogenation beforehand; as well as a process for preparing a salt of an optionally substituted 4-(benzimidazol-2-ylmethylamino)-benzamidine, wherein (a) an optionally correspondingly substituted diaminobenzene is condensed with 2-[4-(1,2,4-oxadiazol-5-on-3-yl)-phenylamino]-acetic acid, (b) the product thus obtained is hydrogenated, and (c) i) optionally the amidino group is carbonylated and ii) without prior isolation of the intermediate product of the carbonylation the desired salt is isolated.

Description

RELATED APPLICATIONS [0001] This application claims priority to German Application DE 10 2005 061 623.2 filed Dec. 21, 2005, which is hereby incorporated by reference. BACKGROUND TO THE INVENTION [0002] 1. Technical Field [0003] The invention relates to a process for preparing an optionally substituted 4-(benzimidazol-2-ylmethylamino)-benzamidine, wherein [0004] (a) an optionally correspondingly substituted diaminobenzene is condensed with 2-[4-(1,2,4-oxadiazol-5-on-3-yl)-phenylamino]-acetic acid and [0005] (b) i) the product thus obtained is hydrogenated and [0006] ii) optionally the amidino group is carbonylated without isolating the intermediate product of the hydrogenation beforehand. [0007] The 4-(benzimidazol-2-ylmethylamino)-benzamidine thus obtained may subsequently be converted into a salt. [0008] Moreover, the invention relates to a process for preparing a salt of an optionally substituted 4-(benzimidazol-2-ylmethylamino)-benzamidine, wherein [0009] (a) an optionally corre...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C07D235/02
CPCC07D271/07C07D413/14C07D401/12A61P7/02C07D271/06
Inventor ZERBAN, GEORGHAUSHERR, ARNDTSCHLARB, KERSTINHAMM, RAINERKOCH, GUNTERWEYELL, BJOERNSCHMITT, HEINZ-PETER
Owner BOEHRINGER INGELHEIM INT GMBH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com