532-03-6 Usage
Chemical Properties
White Solid
Originator
Robaxin ,Robins,US,1957
Uses
Different sources of media describe the Uses of 532-03-6 differently. You can refer to the following data:
1. For use as an adjunct to rest, physical therapy, and other measures for the relief of discomforts associated with acute, painful musculoskeletal conditions.
2. Methocarbamol suppresses multisynaptic pathways in the spinal cord. It is used for relieving
spasms and skeletal muscle pain as well as for treating tetanus. Synonyms of this drug
are delaxin, forbaxin, robamol, robaxin, and tresortil.
Manufacturing Process
The starting material for methocarbamol is 3-o-methoxyphenoxy-1,2- propanediol (guaiacol glyceryl ether) (see entry under Guaifenesin for its preparation). To a stirred suspension of 198.2 g (1.0 mol) of 3-omethoxyphenoxy-1,2-propanediol in 1,000 ml of dry benzene contained in a 5-liter, 3-neck, round bottom flask equipped with a thermometer, dropping funnel and blade stirrer, was added dropwise (in 30 minutes) a solution of 98.9 g (1.0 mol) of phosgene in 400 ml of cold dry benzene. The mixture was stirred at 30°C until all solid material dissolved (about 3 hours was required) and stirring was continued for 30 minutes longer. To this mixture was added
dropwise 79.1 g (1.0 mol) of dry pyridine, the temperature being held below
30°C by cooling. After addition of the pyridine, stirring at 30°C was continued
for 30 minutes.The mixture was cooled to 7°C, extracted with two 500-cc portions of ice
water to remove pyridine hydrochloride, and the benzene solution of 3-omethoxyphenoxy-2-hydroxypropyl chlorocarbonate was added to 500 ml of
cold concentrated ammonium hydroxide. The mixture was vigorously stirred at
5°C for 6 hours, then the crude white precipitate of 3-o-methoxyphenoxy-2-
hydroxypropyl carbamate was filtered off, dissolved in 1,500 ml of hot
benzene and completely dried by codistillation of last traces of water with
benzene, treated with decolorizing carbon and filtered while hot. On cooling
160 g of product crystallized as white needles melting at 88° to 90°C.
Brand name
Delaxin (Ferndale); Forbaxin
(Forest); Robaxin (Baxter Healthcare).
Therapeutic Function
Muscle relaxant
Synthesis Reference(s)
The Journal of Organic Chemistry, 22, p. 1595, 1957 DOI: 10.1021/jo01363a016
General Description
Methocarbamol, 3-(o-methoxyphenoxy)-1,2-propanediol 1-carbamate (Robaxin), issaid to be more sustained in effect than mephenesin. Likelysites for metabolic attack include the secondary hydroxylgroup and the two ring positions opposite the ether functions.The dihydric parent compound, guaifenesin, is used asan expectorant.
Synthesis
Methocarbamol, 3-(2-methoxyphenoxy)-1,2-propanediol-1 carbamate
(15.3.13), is synthesized by successive reaction with phosgene and then ammonia into 3-
(2-methoxyphenoxy)propanediol-1,2.
Veterinary Drugs and Treatments
In dogs and cats, methocarbamol is indicated (FDA approved) “as
adjunctive therapy of acute inflammatory and traumatic conditions
of the skeletal muscle and to reduce muscular spasms.” In horses,
intravenous use is indicated (FDA approved) “as adjunctive therapy
of acute inflammatory
and traumatic conditions of the skeletal
muscle to reduce muscular spasms, and effect striated
muscle relaxation.”
(Package insert; Robaxin?V—Robins)
Check Digit Verification of cas no
The CAS Registry Mumber 532-03-6 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 5,3 and 2 respectively; the second part has 2 digits, 0 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 532-03:
(5*5)+(4*3)+(3*2)+(2*0)+(1*3)=46
46 % 10 = 6
So 532-03-6 is a valid CAS Registry Number.
InChI:InChI=1/C11H15NO5/c12-11(15)17-10-4-2-1-3-9(10)16-6-5-8(14)7-13/h1-4,8,13-14H,5-7H2,(H2,12,15)
532-03-6Relevant articles and documents
Method for preparing methocarbamol
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Paragraph 0036-0037; 0038-0039; 0040-0041; 0042-0055, (2019/07/16)
The invention discloses a method for preparing methocarbamol. The method comprises the steps that guaifenesin serves as a raw material, alkali and 4-dimethylaminopyridine serve as a catalyst, carbonicester serves as an esterification agent, and a compound shown in the formula (I) is obtained through an esterification reaction, the compound shown in the formula (I) reacts with ammonia water through an ammoniation reaction to obtain the methocarbamol shown in the formula (II), and the reaction equation of the methocarbamol is that the alkali is hydroxide or carbonate of the first main alkali metal group. Accordingly, guaifenesin serves as a raw material, the alkali and DMAP serves as the catalyst, the carbonic ester is catalyzed to be esterified and then ammonified and crystallized, and themethocarbamol is obtained. A nucleophilic reagent DMAP is used for catalysis, the carbonic ester can rapidly and highly selectively complete the reaction with hydroxide radical, and the high-yield guaifenesin ester is obtained; in addition, the dosage of the carbonic ester is small, safety and environmental protection are achieved, pollution is small, the economic benefit is high, operation is easy, and the method is suitable for industrial production.
