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(4S,5R)-(-)-4-METHYL-5-PHENYL-2-OXAZOLIDINONE typically exists in the form of a white crystalline solid. The molecular formula is C11H13NO2, CAS 16251-45-9, and its molecular structure contains oxazolidine ring, benzene ring, and methyl group. Soluble in some organic solvents, such as ethanol, methanol, and dichloromethane. However, the solubility in water is relatively low. It is a chiral compound and belongs to the RRR stereoisomer. It has optical rotation properties and can cause polarized light to undergo optical rotation. An important organic compound with extensive applications in organic synthesis and drug development.

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Chemical Formula |
C10H11NO2 |
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Exact Mass |
177 |
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Molecular Weight |
177 |
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m/z |
177 (100.0%), 178 (10.8%) |
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Elemental Analysis |
C, 67.78; H, 6.26; N, 7.90; O, 18.06 |

(4S,5R)-(-)-4-METHYL-5-PHENYL-2-OXAZOLIDINONE is an organic compound with a specific chiral structure, with the molecular formula C ₁₀ H ₁₁ NO ₂, molecular weight 177.2, and CAS accession number 16251-45-9. This compound is a milky white solid powder at room temperature and pressure, with certain optical rotation properties. It is difficult to dissolve in water and ether organic solvents, but soluble in dichloromethane and alcohol organic solvents. Due to its unique chiral structure and chemical properties, it has a wide range of applications in multiple fields.
Organic synthesis intermediates
Plays an important intermediate role in organic synthesis. Its chiral structure enables it to act as a chiral assistant in asymmetric synthesis, inducing high enantioselectivity of reactions and thus constructing compounds with specific chiral centers.
Chiral induced synthesis
In organic synthesis, constructing chiral centers is a challenging task. By the rigid structure of its oxazolinone ring, the conformation of the substrate can be restricted, allowing nucleophiles to attack from specific directions, thereby inducing high enantioselectivity in the reaction. For example, in the aldol reaction and Michael addition reaction, this compound can regulate the stereoconfiguration of the product, generating products with specific chiral centers.
In the Diels Alder reaction, the ability to regulate the endo/exo selectivity of the product further expands its application range in organic synthesis.
Peptide synthesis
In the field of peptide synthesis, it can serve as a protective or chiral auxiliary group to protect the amino or carboxyl groups of amino acids and prevent side reactions during the synthesis process. Meanwhile, its chiral structure helps induce the correct folding of polypeptide chains, generating peptide molecules with specific biological activities.
Drug development
It has important application value in drug development. Its chiral structure enables it to serve as the chiral center or chiral auxiliary group of drug molecules, participating in the synthesis and modification of drugs, thereby developing drug molecules with specific biological activity and pharmacokinetic properties.
Chiral drug synthesis
Many drug molecules have chiral centers, and the pharmacological activity and toxicity of different enantiomers may vary significantly. Being able to act as chiral adjuvants, participate in the synthesis of chiral drugs, induce the generation of enantiomers with specific pharmacological activities, and improve the efficacy and safety of drugs.
For example, in the synthesis of certain antibiotics, anti-tumor drugs, or neurological drugs, the introduction of (4S, 5R) - (-) -4-methyl-5-phenyl-2-oxazolinone as a chiral auxiliary group can significantly increase the enantiomeric excess value (ee value) of the target product, thereby obtaining high-purity chiral drug molecules.
Drug modification and optimization
In the process of drug development, modifying and optimizing existing drug molecules is an important means to improve drug efficacy and reduce toxicity. Being able to act as a chiral modifying group, it can be introduced into drug molecules to alter their stereoconfiguration and physicochemical properties, thereby optimizing the pharmacokinetic properties and pharmacological activity of drugs.
For example, by introducing this substance as a chiral modifying group, the solubility, stability, and bioavailability of drug molecules can be improved, enhancing the efficacy and safety of drugs.
Chiral Separation and Purification
It also has important applications in the field of chiral separation and purification. Its chiral structure enables it to serve as a template molecule for the preparation of chiral separation materials, such as molecularly imprinted polymers (MIPs), thereby achieving the separation and purification of chiral compounds.
Preparation of molecularly imprinted polymers
Molecularly imprinted polymers are synthetic materials with specific recognition sites that can selectively recognize and separate chiral compounds. It can serve as a template molecule and form complexes with functional monomers through non covalent interactions such as hydrogen bonding and electrostatic interactions. During the polymerization process, these complexes are fixed in the polymer matrix, forming molecularly imprinted polymers with specific recognition sites.
When a mixture containing chiral enantiomers passes through the molecularly imprinted polymer, enantiomers that match the template molecule configuration can preferentially bind to the holes, thereby achieving chiral separation. This method has the advantages of easy operation, high separation efficiency, and reusability, and has broad application prospects in the separation and purification of chiral compounds such as chiral drugs and pesticides.
Chiral chromatography column packing
In addition to molecularly imprinted polymers, they can also be used as chiral chromatography column fillers for chromatographic separation of chiral compounds. By fixing it on a chromatographic column carrier, a chromatographic column with specific chiral selectivity can be prepared, achieving rapid and efficient separation of chiral compounds.
Materials Science
It also has potential application value in the field of materials science. Its unique chemical structure and physical properties enable it to serve as a functional monomer or additive for the preparation of materials with specific properties.
Synthesis of Polymer Materials
In the synthesis of polymer materials, it can be introduced as a functional monomer into the polymer chain, endowing the polymer material with specific physical and chemical properties. For example, by introducing the compound as a chiral modifying group, polymer materials with chiral recognition ability can be prepared for the preparation of chiral sensors or the separation and purification of chiral compounds.
Preparation of nanomaterials
In the field of nanomaterial preparation, (4S, 5R) - (-) -4-methyl-5-phenyl-2-oxazolinone can be used as a surface modifier or stabilizer for the preparation and surface modification of nanoparticles. By adsorbing it onto the surface of nanoparticles, the dispersion and stability of nanoparticles can be improved, while endowing them with specific biocompatibility and functionality. This is of great significance for the application of nanomaterials in biomedical, catalytic and other fields.

(4S,5R)-(-)-4-METHYL-5-PHENYL-2-OXAZOLIDINONE is a chiral synthetic block that can be synthesized through various methods. The following are some common methods for synthesizing (4S, 5R) - (-) -4-METHYL-5-PHENYL-2-OXAZOLIDINONE in the laboratory:
This method first involves bromination of benzaldehyde to obtain bromide, followed by condensation reaction with hydroxylamine to generate oxime, and then hydrolysis reaction with hydrogen chloride to obtain (4S, 5R) - (-) -4-METHYL-5-PHENYL-2-OXAZOLIDINONE. The advantage of this method is that the conditions are relatively mild, but due to the use of a large amount of hydroxylamine and hydrogen chloride, as well as the need for bromination reaction, the reaction cost is relatively high.
a. Bromination reaction: C6H5CHO + Br2 → C6H5CHBr
b. Condensation reaction: (C6H5CHBr)2 + 2NH2OH → (CH3CONHCH2)2
c. Hydrolysis reaction: C6H5CHBr + 2HCl → C10H11NO2
This method uses condensation reaction between acetophenone and malonic acid under alkaline conditions to generate corresponding malonate, which is then hydrolyzed using hydrogen chloride to obtain (4S, 5R) - (-) -4-METHYL-5-PHENYL-2-OXAZOLIDINONE. The raw materials used in this method are relatively cheap, but the reaction conditions are more demanding, and a large amount of alkali and hydrogen chloride are required, resulting in higher costs.
a. Condensation reaction: C6H5CHO + CH2 (COOH)2 → CH2 (COOCH3)2
b. Hydrolysis reaction: CH2 (COOCH3)2 + 2NaOH → CH2(COONa) 2 + 2CH3OH
c. Hydrolysis reaction: (CH3CONa)2 + 2HCl → C10H11NO2
This method uses acetophenone and ammonia to undergo an ammonolysis reaction under the action of a catalyst to generate corresponding ammonia esters, and then uses trifluoromethanesulfonic acid for hydrolysis reaction to obtain (4S, 5R) - (-) -4-METHYL-5-PHENYL-2-OXAZOLIDINONE. The raw materials used in this method are relatively cheap, but require a large amount of ammonia and trifluoromethanesulfonic acid, as well as the use of catalysts, resulting in higher costs.
a. Ammonia hydrolysis reaction: C6H5CHO + NH3 → C6H5CONHCH3
b. Hydrolysis reaction: C6H5CONHCH3 + CF3SO3H → C10H11NO2
This method uses an addition reaction between acetophenone and enol silyl ether under the action of a catalyst to generate the corresponding enol silyl ether intermediate, which is then hydrolyzed using trifluoromethanesulfonic acid to obtain (4S, 5R) - (-) -4-METHYL-5-PHENYL-2-OXAZOLIDINONE. The raw materials used in this method are relatively cheap and the conditions are relatively mild, but a large amount of enol silicone ether and trifluoromethanesulfonic acid are required, resulting in higher costs.
a. Addition reaction: C6H5CHO + CH2=CHSi (OEt)3 → C6H5CH=CHSi (OEt) 3
b. Hydrolysis reaction: C6H5CH=CHSi (OEt)3 + CF3SO3H → C10H11NO2
In summary, all of the above methods can be used to synthesize (4S,5R)-(-)-4-METHYL-5-PHENYL-2-OXAZOLIDINONE in the laboratory. It should be noted that these methods have different advantages and disadvantages, so when choosing a synthesis method, it is necessary to choose the most suitable method according to the actual situation. At the same time, attention should also be paid to the standardization and safety of experimental operations.
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