73-40-5 Usage
Organic bases
Guanine is an organic base that is widespread in the animal and the plant kingdom. The chemical name is 2-amino-6-oxo-purin. It is colorless square crystals or crystalline powder. In the aqueous solution containing a large excess of ammonia, it will become small diamond crystal after slowly evaporating the water. It has a melting point of 360 ℃ (partially decomposed and sublimated). It can be dissolved in ammonia water, caustic soda and dilute mineral acid, slightly soluble in ethanol, ethyl ether, and insoluble in water. It has a strong UV absorption. It is the major composition of guanosine and guanylate. Its hydrochloride monohydrate is powdery crystals with water being loss at 100 ℃ and hydrogen chloride being loss at 200 ℃. It can be dissolved in acidified water but is insoluble in water, alcohol, and ether. Guanine can be obtained through the hydrolysis of scale in hydrochloric acid. It is an important base composition of nucleic acids, being one of the four major bases of DNA and RNA as well as the compassion of various kinds of guanylate. Its N9 can be connected with the C1 of ribose or deoxyribose with β-glycosidic bond to obtain guanosine or deoxy-guanosine.
[Major application]: for biochemical research and preparation of caffeine and other drugs.
Its chemical composition is 2-amino-6-mercaptopurine. It, together with adenine, constitutes the two major purines bases in the nucleic acid. Through binding to ribose guanosine or deoxyribose guanosine through the glycosidic linkages, the corresponding triphosphates are guanosine triphosphate or deoxyguanosine triphosphate, respectively. They are the precursor of guanine during the biosynthesis process of RNA and DNA.
6-Thioguanine
6-Thioguanine belongs to another kind of common purine metabolism antagonist in the inhibition of the purine synthesis pathway and is a cell cycle specific drugs to which those cells locating in the cycle S period are most sensitive. In addition to inhibit the biosynthesis of cellular DNA, it also has mild inhibitory effect on the biosynthesis of RNA. This product is a kind of guanosine analogs. It becomes active only after being converted to 6-TG ribonucleotide via the phosphor-ribosyltransferase inside human body. The action process of this product is similar to that of mercapto-purine. In addition, 6-TG ribonucleotide, through its inhibitory effect on guanylate kinase, can prevent the phosphorylation of guanosine monophosphate (GMP) into guanosine diphosphate (GDP). This product, after being metabolized into deoxyribonucleoside triphosphate, can be embedded in DNA, thus further inhibiting the biosynthesis of nucleic acids while mercaptopurine having no effect. The product has cross-resistance with mercaptopurine while it can have its efficacy improved upon combination with other drugs such as cytarabine. Its oral absorption after oral administration is incomplete, at about 30%. Only a relatively small amount of the drug can shift from the blood to penetrate through the blood-brain barrier, therefore at generally oral dose, it is insufficient to prevent and treat meningeal leukemia. The activation and decomposition process of the product both proceeds in the liver with being de-activated through either shifting the amino-methyl mercaptopurine via methylation or shifting to mercaptopurine via deamination. However, the metabolic process of inactivation is not related to xanthine oxidase, therefore taking allopurinol has no significant inhibitory effect on the metabolism of this product. The half-life of intravenous injection is 25~240 min with the average period being 80 min. Through being excreted through the kidneys, for one time of oral administration, about 40% of the drug is excreted in urine in the form of metabolites within 24h with only trace amount of 6-Thioguanine being detected in the urine.
Chemical Properties
Different sources of media describe the Chemical Properties of 73-40-5 differently. You can refer to the following data:
1. It is colorless needle crystal or amorphous powder. The melting point is 360 ℃ (decomposition). It is easily soluble in acid and alkali, slightly soluble in alcohol, ether, but insoluble in water.
The above information is edited by the lookchem of Dai Xiongfeng.
2. white to light yellow crystal powder
Uses
Different sources of media describe the Uses of 73-40-5 differently. You can refer to the following data:
1. It can be used for biochemical studies.
It can be used as the intermediates of the antiviral drugs acyclovir.
It can be used as the intermediate of thioguanine and open-ringed guanine.
2. Guanine is a crystalline amorphous substance that is found in guano, fish scales, and theliver of certain mammals. Guanine is responsible for the silvery iridescence of certain fishscales. Before its discovery, guanine was scraped from fish scales and used to coat beads to produceimitation pearls. Thus it was called pearl essence or pearly white in the 1700s. Guanineobtained from fish scales is used in cosmetics, especially for eye cosmetics and nail polishes.
3. Guanine is on one of the five nucleobases incorporated into biological nucleic acids. Guanine, along with adenine and cytosine, is present in both DNA and RNA, whereas thymine is usually seen only in
DNA, and uracil only in RNA.
4. guanine is mixed in water and used primarily in nail polish to achieve a pearlized effect. It has been greatly replaced by either synthetic pearl or aluminum and bronze particles. guanine is obtained from plant or animal sources.
Production method
5-amino-4-imidazolyl amide can have esterification reaction with isothiocyanate methylbenzene to generate ester, and then successfully reacted with methyl iodide, ammonia to synthesize it.
History
Guanine is one of the two purines comprising the five nucleic acid bases. Much of the information
regarding the general role of nucleic acid bases is covered in Adenine and Cytosine. Guanine gets its name from guano, from which it was first isolated in the 1840s. Albrecht Kossel (1853 1927) determined that guanine (as well as adenine, cytosine, thymine and uracil) was a component of nucleic acid in the last two decades of the 19th century. Similar to adenine, guanine combines with ribose to form a nucleoside. The nucleoside produced is guanosine, which in turn combines with one to three phosphoryls to yield the nucleotides guanosine monophosphate (GMP), guanosine diphosphate (GDP), and guanosine triphosphate (GTP), respectively. Guanine nucleotides play an important role in metabolism including the conversion of adenosine diphosphate (ADP) to adenosine triphosphate (ATP) and carbohydrate metabolism.
Definition
Different sources of media describe the Definition of 73-40-5 differently. You can refer to the following data:
1. A nitrogenous
base found in DNA and RNA. Guanine has
a purine ring structure.
2. guanine: A purine derivative. It isone of the major component bases ofnucleotides and the nucleic acidsDNA and RNA.
3. ChEBI: A 2-aminopurine carrying a 6-oxo substituent.
General Description
Pharmaceutical secondary standards for application in quality control, provide pharma laboratories and manufacturers with a convenient and cost-effective alternative to the preparation of in-house working standards.Guanine is one of the building blocks of both RNA and DNA that plays a significant role in protein biosynthesis as well as the storage of genetic information.
Biological Activity
guanine is one of the four main nucleobases found in the nucleic acids dna and rna.guanine is a purine derivative, consisting of a fused pyrimidine-imidazole ring system with conjugated double bonds.
Check Digit Verification of cas no
The CAS Registry Mumber 73-40-5 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 7 and 3 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 73-40:
(4*7)+(3*3)+(2*4)+(1*0)=45
45 % 10 = 5
So 73-40-5 is a valid CAS Registry Number.
InChI:InChI=1/C5H5N5O/c6-5-9-3-2(4(11)10-5)7-1-8-3/h1H,(H4,6,7,8,9,10,11)
73-40-5Relevant articles and documents
Origin of difference between one-electron redox potentials of guanosine and guanine: Electrochemical and quantum chemical study
Langmaler, Jan,Samec, Zdeneì?k,Samcovaì?, Eva,Hobza, Pavel,Rì?eha, David
, p. 15896 - 15899 (2004)
Cyclic voltammetry was used to measure the rates of the chemical oxidation of guanine (G), guanosine (Gs), 2a?2-deoxyguanosine (dG), and 2a?2-deoxyguanosine 5a?2-monophosphate (dGMP) by electrochemically generated tris(2,2a?2-bipyridyl)ruthenium(III). The numeric fit of voltammograms to an ECCCE type of mechanism provided the equilibrium and rate constants of the two-step chemical oxidation of the guanine species. One-electron redox potentials evaluated from the equilibrium constant of the first electron uptake follow the sequence G + and partly from the higher difference in the hydration energy between the deprotonated radical Gs(-H) and the parent Gs, which compensate for the lower ionization potential of Gs compared to that of G.
π-Interactions of modified nucleobases. On mesomeric purine betaines with inversed charge properties
Schmidt, Andreas,Karl Kindermann, Markus
, p. 2379 - 2384 (2001)
Intermolecular interactions of modified nucleobases with altered charge properties in relation to natural systems are studied. We prepared conjugated mesomeric betaines of purines and examined their properties by semiempirical calculations, IH
Novel use of a guanosine prodrug approach to convert 2′,3′-didehydro-2′,3′-dideoxyguanosine into a viable antiviral agent
Ray, Adrian S.,Yang, Zhenjun,Chu, Chung K.,Anderson, Karen S.
, p. 887 - 891 (2002)
Transient kinetic studies with human immunodeficiency virus (HIV) type 1 reverse transcriptase suggest that nucleotide analogs containing the 2′,3′-didehydro-2′,3′-dideoxy ribose ring structure present in D4T (stavudine) triphosphate are among the most effective alternative substrates. For unclear reasons, however, the corresponding purine nucleoside, 2′,3′-didehydro-2′,3′-dideoxyguanosine (D4G), was found to be inactive in cell culture. We have found that the previously reported lack of activity of D4G is primarily due to solution instability, and in this report we describe a novel use of a guanosine prodrug approach to stabilize the nucleoside. D4G was modified at the 6 position of the purine ring to contain a cyclopropylamino group yielding the prodrug, cyclo-D4G. An evaluation of cyclo-D4G revealed that the prodrug possessed anti-HIV activity. In addition, cyclo-D4G had increased stability, lipophilicity, and solubility, as well as decreased toxicity relative to D4G, suggesting that further study is warranted.
THE EFFECT OF METAL ION COMPLEX FORMATION ON ACIDIC DEPURINATION OF 2'-DEOXYADENOSINE AND 2'-DEOXYGUANOSINE
Arpalahti, Jorma,Kaeppi, Rainer,Hovinen, Jari,Loennberg, Harri,Chattopadhyaya, Jyoti
, p. 3945 - 3954 (1989)
The substitution inert N7-(dien)Pt(II) complex of 2'-deoxyguanosine has been shown to undergo acidic depurination 200 times less readily than the uncomplexed nucleoside, whereas the corresponding N1- and N7-complexes of 2'-deoxyadenosine are depurinated almost as rapidly as the nucleoside itself.These observations have been compared to the influences that several substitution labile metal ions exerted on the rate of depurination.Accordingly, the effects of (dien)Pd(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) ions on the acidic hydrolysis of 2'-deoxyadenosine and 2'-deoxyguanosine have been accounted for by competitive attachment of protons and metal ions to the N1 and N7 sites.The applicability of metal ions in chemical DNA sequencing is briefly discussed.
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Hayatsu
, p. 2677,2678 (1976)
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Method for synthesizing guanine by guanosine hydrolysis method (by machine translation)
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Paragraph 0031-0070, (2020/08/02)
The invention belongs to the field of chemical synthesis, and particularly relates to a method for synthesizing guanine by a guanosine hydrolysis method. After the reaction is completed, the pH of the system is adjusted to 20 °C - 35 °C, and pH of the system is adjusted to neutral, filtered and collected to obtain a guanine wet product. The method has the advantages of high yield of guanine products, high purity, high reaction yield 96.0-98 .0percent, product purity 99.5-99 .8percent, simple operation process, short production period, low single batch reaction time and 1 hour, and is suitable for industrial mass production. (by machine translation)
Preparation method and application of 2, 4-diamino-6-hydroxy-5-formamidopyrimidine
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Paragraph 0073-0083, (2020/09/20)
The invention discloses a preparation method of 2, 4-diamino-6-hydroxy-5-carboxamido pyrimidine. The preparation method comprises the following step: carrying out an acylation reaction on 2, 4-diamino-5-nitroso-6-hydroxypyrimidine in formamide and water under the catalytic action of a catalyst A to obtain the 2, 4-diamino-6-hydroxy-5-carboxamido pyrimidine. The invention also discloses a preparation method of guanine formate or guanine. The preparation method of guanine formate or guanine comprises the following step: reacting the 2, 4-diamino-6-hydroxy-5-formamidopyrimidine in formic acid toobtain guanine. According to the synthesis methods of the 2, 4-diamino-6-hydroxy-5-formamidopyrimidine and guanine, the production process is greatly shortened, the generation amount of three wastes is greatly reduced, the product quality of the guanine product meets related quality requirements, and the molar yield is higher than that of the guanine product prepared by the prior art. Therefore, the preparation methods disclosed by the invention are efficient, economic, green and environment-friendly preparation methods.
