Methimazole Property

Melting point:

144-147 °C (lit.)

Boiling point:

280 °C

Density 

1.176 (estimate)

refractive index 

1.5000 (estimate)

Flash point:

280°C

storage temp. 

2-8°C

solubility 

200g/l

form 

Crystalline Powder

pka

12.37±0.50(Predicted)

color 

White to slightly cream or pale buff

Water Solubility 

soluble

Merck 

14,5971

BRN 

108646

CAS DataBase Reference

60-56-0(CAS DataBase Reference)

NIST Chemistry Reference

Methimazole(60-56-0)

IARC

3 (Vol. 79) 2001

EPA Substance Registry System

Methimazole (60-56-0)

Safety

Hazard Codes 

Xn

Risk Statements 

43-62-63-22

Safety Statements 

26-27-36-45-36/37

WGK Germany 

3

RTECS 

NI8615000

TSCA 

Yes

HS Code 

29332990

Hazardous Substances Data

60-56-0(Hazardous Substances Data)

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H302Harmful if swallowed

H317May cause an allergic skin reaction

H319Causes serious eye irritation

Precautionary statements

P202Do not handle until all safety precautions have been read and understood.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.

P302+P352IF ON SKIN: wash with plenty of soap and water.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P308+P313IF exposed or concerned: Get medical advice/attention.

Methimazole Chemical Properties,Usage,Production

description

Methimazole is an antithyroid medication used in the therapy of hyperthyroidism and Graves disease. It works by making it harder for the body to make thyroid hormone.
It is also known as thiamazole, is a thioamide and a thyroid hormone antagonist which acts by inhibiting the incorporation of iodine into tyrosyl residues of thyroglobulin and, thus, lowering thyroid hormone levels.
It resembles propylthiouracil both in chemical structure and activity.
Methimazole is primarily used for the treatment of hyperthyroidism, by inhibiting the peroxidase system, hindering thyroxine (T4) and tri-triiodothyronine (T3) synthesis, animal experiments show that it can inhibit B lymphocytes synthesizing antibodies, and reduce levels of thyroid stimulating antibodies in blood circulating it can make suppressing T cell function return to normal, it is applicable to hyperthyroidism caused by a variety of factors . Like other various drugs (propylthiouracil), it also has some adverse reactions while it is taken, Including hematologic adverse reactions, primarily neutropenia, hematopoietic dysfunction or disorder, thrombocytopenia, reduction of prothrombin or factor VII ; long-term medication can also cause liver damage,such as cholestatic jaundice and toxic hepatitis ; other skin reactions such as hair loss, itching, rash, dermatitis, lupus erythematosus, as well as some other rare adverse reactions. Also methimazole allows prothrombin time to prolong , and increases serum alkaline phosphatase, aspartate aminotransferase (AST) and alanine aminotransferase (ALT)and causes blood bilirubin and blood lactate dehydrogenase increasing. Therefore, patients in the medication should regularly take blood tests, liver function tests and peripheral blood leukocytes.
The above information is edited by the Chemicalbook of Tian Ye.

Chemical properties

leaf-shaped crystalline (ethanol), melting point 146-148 ℃, boiling point 280 ℃ (decomposition), soluble in water, soluble in alcohol, chloroform, slightly soluble in ether, benzene.

Uses

Carbimazole intermediates.
anti-thyroid drugs.

Production methods

React amino acetal with methyl isothiocyanate to genarate this product. The product can also be produced from thiocyanate and N-substituted amino acetal.

Chemical Properties

White Solid

Originator

Favistan ,Asta

Uses

Methimazole also directly disrupts thyroxine and triiodothyronin sysnthesis in the thyroid gland, and it is used for the same indications as propylthiouracil and methylthiouracil to treat hyperfunctioning thyroid glands in patients with Basedow’s disease.

Uses

2-Mercapto-1-methylimidazole was employed as hydrophobic charge-induction chromatography ligand for antibody purification. It was also used in preparation of nitrile functionalized methimazole-based room temperature ionic liquids.

Uses

Methimazole is a thiourea antithyroid agent that prevents iodine organification, thus inhibiting the synthesis of thyroxine. Antihyperthyroid

Definition

ChEBI: Methimazole is a member of the class of imidazoles that it imidazole-2-thione in which a methyl group replaces the hydrogen which is attached to a nitrogen. It has a role as an antithyroid drug.

Manufacturing Process

2 Methods of preparation of thiamazole:
1. To 2,2-diethoxyethylamine methylisothiocyanate was added and mixed after then 1-(2,2-diethoxy-ethyl)-3-methylthiourea was obtained.
The reaction of the 1-(2,2-diethoxyethyl)-3-methylthiourea with sulfuric acid yield thiamazole.
2. 1,1-Diethoxyethane was treated by bromine in the presence CaCO3 and 2- bromo-1,1-diethoxyethane was obtained.
Then to the 2-bromo-1,1-diethoxyethane methylamine was added, mixed and reaction mixture was heated to 120°-130°C in autoclave. As the result (2,2- diethoxyethyl)methylamine was obtained.
(2,2-Diethoxyethyl)methylamine reacted with potassium thiocyanate in the presence of hydrochloric acid and give the thiamazole, yellow crystallic precipitate, melting point 144°-147°C.

brand name

Tapazole (Jones); Tapazole (King) .

Therapeutic Function

Thyroid inhibitor

General Description

Methimazole, 1-methylimidazole-2-thiol (Tapazole), occurs as a white to off-white, crystallinepowder with a characteristic odor and is freely soluble inwater. A 2% aqueous solution has a pH of 6.7 to 6.9. It shouldbe packaged in well-closed, light-resistant containers.

Biochem/physiol Actions

Methimazole is a thiourea antithyroid agent that prevents iodine organification, thus inhibiting the synthesis of thyroxine.

Clinical Use

Methimazole is indicated in the treatment of hyperthyroidism.It is more potent than propylthiouracil. The side effectsare similar to those of propylthiouracil. As with otherantithyroid drugs, patients using this drug should be undermedical supervision. Also, like the other antithyroid drugs,methimazole is most effective if the total daily dose is subdividedand given at 8-hour intervals.

Safety Profile

Poison by subcutaneous route. Moderately toxic by ingestion and intraperitoneal routes. Human teratogenic effects. An experimental teratogen. Experimental reproductive effects. Questionable carcinogen with experimental neoplastigenic data. Human mutation data reported. An antithyroid drug. When heated to decomposition it emits very toxic fumes of NOx and SOx. See also MERCAPTANS.

Synthesis

Methimazole, 1-methyl-2-imidazolthiol (25.2.5), is synthesized by reacting aminoacetic aldehyde diethylacetal with methylisothiocyanate and subsequent hydrolysis of the acetal group of the resulting disubstituted urea derivative 25.2.4 by a solution of sulfuric acid, during which a simultaneous cyclization reaction takes place, forming the imidazole ring of the desired methimazole .

Veterinary Drugs and Treatments

Methimazole is considered by most clinicians to be the agent of choice when using drugs to treat feline hyperthyroidism. Propylthiouracil has significantly higher incidences of adverse reactions when compared to methimazole and is rarely used today. Transdermal methimazole (in PLO gel; 2.5 mg twice daily) has been used with some therapeutic success in cats that do not tolerate oral dosing. Efficacy may require four or more weeks to detect. Studies are ongoing.
Methimazole appears to be useful for the prophylactic prevention of cisplatin induced nephrotoxicity in dogs.

Purification Methods

Crystallise it from EtOH. UV: at 251nm (H2O), 260nm (EtOH) and 267nm (CHCl3). [Lawson max & Morley J Chem Soc 1103 1956, Beilstein 24 H 17, 24 III/IV 61.]