CN102558235A - Method for preparing arsanilic acid by diazotizing trimethoprim - Google Patents

Abstract

The invention discloses a method for preparing arsanilic acid by diazotizing trimethoprim, which is characterized in that trimethoprim is subjected to diazotization reaction under the existence of HCl and HNO2 to generate trimethoprim diazo salt; trimethoprim diazo salt is subjected to coupling reaction with arsanilic acid to generate molecules which are combined with azo bond and possess bifunctional groups. According to the invention, water-soluble side chain (TMP) is covalently bound to a medicine (arsanilic acid) which is insoluble in water; the arsanilic acid is conversed to the water-soluble medicine, thereby the disadvantages of low medicine dissolvability and low bioavailability caused by poor absorption can be solved.

Description

A kind of method for preparing the Pro-gen 90 preparation through trimethoprim diazotization

Technical field

The present invention relates to a kind ofly prepare the method for Pro-gen 90 preparation, belong to beastly bird field of pharmaceutical preparations through trimethoprim diazotization.

Background technology

Based on the modern livestock breeding industry of fodder industry and intensification, be not merely society very abundant animal derived food is provided, and greatly promoted the fast development of veterinary drug (fodder additives) industry.Under high feed nutrition concentration, high-density breeding condition, beastly fowl resistibility is poor, and the risk of mass-producing livestock-raising is constantly risen; In order to reduce case fatality rate; Pursue high efficiency, have to use veterinary drug and fodder additives in a large number, comprise various microbiotic, chemical synthetic drug etc.

Using with overdose on a large scale of many kinds, high dosage veterinary drug (fodder additives), its drawback shows especially day by day.The consequence of abuse veterinary drug, the one, cause veterinary drug residual in animal food; The 2nd, the veterinary drug utilization ratio is low, and the about 70-80% of employed veterinary drug is discharged in the environment through fecaluria, causes ecological pollution and influences the human food prods through food chain; The 3rd, cause producing a large amount of multidrug resistant disease pathogenic microorganisms.

All veterinary drugs (comprising the fodder additives that prevents usefulness); All should process certain formulation; Form with preparation is applied to treatment, prevents or diagnoses the illness; And the validity of preparation, security, reasonableness and accuracy etc. have then reflected the level of veterinary drug (fodder additives), have determined the effect of veterinary drug.Formulation plays a part very important to the curative effect of medicine, broken " chemical structure " is the traditional concept of unique decision curative effect at present.Be embodied in formulation and can change pharmaceutically-active character; Formulation can be regulated drug effect speed; The change of formulation can reduce or eliminate poisonous side effect of medicine; Formulation can determine the effect of stability of drug and part formulation location target.The bioavailability control of medicine is exactly to control medicine in medicament phase and pharmacokinetics course mutually.The molecule that optimum structure configuration and physico-chemical property are arranged can cause the curative effect of expectation at target site.But it may not have molecular form and the character that is transferred to final effect target.Usually, give and have only the sub-fraction drug molecule to arrive the target area in the dosage, and most of and non-target site interacts, this invalid transmission possibly cause spinoff, so the structure of drug molecule needs further to optimize.The chemical structure of the optimized medicine of medicament chemistry can be improved the physico-chemical property of medicine, more reasonably brings into play the pharmacological action of medicine, improves bioavailability.The existing suitable development of research aspect people's medicine preparation both at home and abroad; Like solid dispersion technology, inclusion technique, emulsifying technology, liposome preparation technology, microencapsulation and miniature balling-up technology and nanoparticle etc.; Mainly be to utilize physical chemistry and pharmaceutical chemical principle that pharmaceutical prepn is studied, owing to the cost reason, the method for much human medicine preparation can not be implanted in the veterinary drug preparation fully and use; And; Veterinary formulations particularly requires administered through oral to work at gi tract as fodder additives mostly, and being characterized in should be both safe and efficient, again low price.

For a long time; On the level of conventional formulations such as veterinary drug preparation still rests on pin, sheet, loose; Though the preparation process level is also improving; But these conventional veterinary drug preparations can not satisfy the development of the high-efficiency agriculture of current high benefit, high production, can not adapt to the high request of intensive culture industry to the diseases of bird and livestock control.

How improve the bioavailability and the result of use of veterinary drug through the processing of preparationization, reduce the usage quantity of veterinary drug, thereby reduce resistance and drug residue, research and development veterinary drug new preparation becomes and improves veterinary drug production aggregate level problem demanding prompt solution.

Up to the present, no matter be people's medicine or veterinary drug, chemical synthetic drug has 30% to be insoluble drug.The veterinary drug of the particularly main oral administration of medicine, the insoluble of fodder additives have caused the reduction of bioavailability, are one of keys of preparation to the veterinary drug solubilising therefore.

Pro-gen 90; Being atoxylic acid (p-ArsaniliAcid), is a kind of organoarsenic medicine for animals, and drugs approved by FDA is used for the feed of pig and chicken as fodder additives; It mainly acts on is the infection that reduces pathogenic bacterias such as intestinal bacteria, staphylococcus, effectively controls chicken necrotizing enterocolitis; Diseases such as treatment and prevention pig dysentery characterized by blood in the stool, enteritis improve growth of animals or poultry speed and feed efficiency, promote to improve skin color by the livestock and poultry pigment deposition, make the ruddy light of skin, and the recommendation consumption of U.S. FDA is pig 90ppm (feed per ton adds 90 grams), chicken 45ppm.Domestic consumption in feed is commonly pig 100-200ppm at present, and chicken is 100-150ppm.Pro-gen 90 must add use with dosage form; Domestic present method of use is that feed and breeding enterprise advance former powder from the raw material pharmaceutical factory and directly add use, and its action effect greatly descends, and this is forcing the user to increase consumption in early stage on the one hand; Not only increase drug cost but also strengthen pollution; Yield the use of this medicine in the later stage owing to general resistance causes the user again on the other hand, and then pursue the alternative medicine of upgrading, form vicious cycle.

Summary of the invention

The objective of the invention is to overcome the shortcomings and deficiencies that exist in the prior art, provide a kind of and prepare the method for Pro-gen 90 preparation through trimethoprim diazotization, the bioavailability of said preparation improves more than 50% than the former powder of present Pro-gen 90.

A kind ofly prepare the method for Pro-gen 90 preparation, it is characterized in that, may further comprise the steps through trimethoprim diazotization:

A) trimethoprim is at HCl and HNO ₂Existence diazotization reaction takes place down, generate the trimethoprim diazonium salt;

B) trimethoprim diazonium salt and Pro-gen 90 generation linked reaction generate suc as formula having the molecule of bifunctional simultaneously with the azo bond bonded shown in (1);

(1)。

The present invention is covalently bound to the water-insoluble drug (Pro-gen 90) with water soluble sidechains (TMP), changes Pro-gen 90 into water soluble drug, thereby solves that medicine dissolution property is low excessively, absorption difference and the low shortcoming of bioavailability that causes.

The present invention utilizes the amino group that exists in the Pro-gen 90 molecule, and covalency introducing Trimethoprim trimethoprim (is commonly called as: trimethoprim in Pro-gen 90 (atoxylic acid) molecule; English Trimethoprim is called for short TMP), make Pro-gen 90 and TMP covalent attachment form Pro-gen 90-TMP, enter into the interior back of body through enzymatic or non-enzymatic hydrolysis, the water-soluble covalency group of removing introducing generates former medicine and works.The present invention makes full use of the characteristic of Pro-gen 90 and TMP, when increasing substantially antibacterial effect, significantly reduces medication quantity.

Further, said preparation method also comprises product shown in the formula (1) is carried out ultramicronising, processes the step of nanoparticulate dispersed preparation.

The Pro-gen 90 preparation is processed the nanoparticulate dispersed preparation, and it is long-pending in the digestive tube action face to have enlarged medicine, has strengthened its anti-microbial activity in digestive tube; And it is water-soluble to have strengthened medicine, and the digestive tube specific absorption is improved.

Embodiment

Embodiment 1:

Adopt following method to prepare the Pro-gen 90 preparation:

A) trimethoprim is at HCl and HNO ₂Existence diazotization reaction takes place down, generate the trimethoprim diazonium salt;

B) trimethoprim diazonium salt and Pro-gen 90 generation linked reaction generate suc as formula having the molecule of bifunctional simultaneously with the azo bond bonded shown in (1);

C) product shown in the formula (1) is carried out ultramicronising, process the nanoparticulate dispersed preparation.

Prepared Pro-gen 90 preparation antibacterial effect increases 50-60%, and dosage can be reduced to 40-60ppm by original 90-110ppm, can reach same effect.

Claims (2)

1. one kind prepares the method for Pro-gen 90 preparation through trimethoprim diazotization, it is characterized in that, may further comprise the steps:

A) trimethoprim is at HCl and HNO ₂Existence diazotization reaction takes place down, generate the trimethoprim diazonium salt;

B) trimethoprim diazonium salt and Pro-gen 90 generation linked reaction generate suc as formula having the molecule of bifunctional simultaneously with the azo bond bonded shown in (1);

2. preparation method as claimed in claim 1 is characterized in that, said preparation method also comprises product shown in the formula (1) is carried out ultramicronising, processes the step of nanoparticulate dispersed preparation.