(R)-(+)-2-METHOXYPROPIONIC ACID

(R)-(+)-2-Methoxypropionic Acid (CAS: 23943-96-6, molecular formula: C₄H₈O₃, molecular weight: 104.11 g/mol) is an optically active, low-molecular-weight carboxylic acid featuring a chiral center at the α-position and a methoxy substituent. This compound is formally classified as a methoxy-substituted propionic acid and is widely recognized as a fundamental chiral building block in asymmetric synthesis. The (R)-enantiomer, designated with a positive optical rotation (hence the (+)- suffix), is of particular value in pharmaceutical and medicinal chemistry research.

What makes (R)-(+)-2-Methoxypropionic Acid particularly valuable is its balanced profile: a compact, polar structure that is both soluble in common organic media and reactive toward standard carboxylic acid transformations — esterification, amidation, reduction, and activation to acyl chlorides or mixed anhydrides — without the need for protecting groups. The methoxy group exerts a mild electron-donating effect, influencing the reactivity of the adjacent carboxyl group and providing additional conformational rigidity compared to unsubstituted propionic acids.

(R)-(+)-2-Methoxypropionic Acid serves as an optically active methoxy acid with balanced polarity and acidity, making it an ideal candidate for esterification, chiral-reactivity studies, and acid–base mechanism investigations, as well as for asymmetric-transform modeling, small-molecule optimization, and functional acid design. It is also a crucial precursor for the synthesis of biologically active molecules, with ongoing investigations into its potential therapeutic applications and its role as a pharmaceutical intermediate.

In recent years, as the demand for enantiomerically pure intermediates has grown in drug development, agrochemical research, and specialty chemical manufacturing, (R)-(+)-2-Methoxypropionic Acid has become an increasingly sought-after tool for chemists working at the interface of synthetic methodology and medicinal chemistry.

Product Parameters

How Does This Enantiomer Differ from Its (S) Sister?

The differences in reported boiling points reflect different pressure conditions (20 vs. 30 mmHg), not a discrepancy in the compound itself. For most practical purposes, the physical properties are identical except for the direction of optical rotation.

Key Applications

1. Complementary Chiral Resolution

When resolving a racemic amine, sometimes the (S) acid gives a crystalline salt with one enantiomer, while the (R) acid gives a crystalline salt with the other. Having both enantiomers allows you to choose the more convenient or higher‑yielding resolution path. This is especially valuable in pharmaceutical process development where cost and scalability matter.

2. Chiral Derivatizing Agent (CDA) for NMR

The (R) enantiomer is used to derivatize racemic amines or alcohols, producing diastereomers that can be analyzed by ¹H NMR. Using both (R) and (S) CDAs can help confirm the absolute configuration of an unknown sample by comparing the chemical shift patterns. The methoxy singlet (around 3.3–3.4 ppm) often shows a clean splitting pattern in diastereomers, making integration straightforward.

3. Synthesis of Enantiopure Building Blocks

(R)-2‑Methoxypropionic acid can be reduced to (R)-2‑methoxypropanol, which is a chiral synthon for liquid crystals, pheromones, and certain pharmaceutical intermediates. The acid chloride (prepared with oxalyl chloride or SOCl₂) is a versatile acylating agent for introducing the (R)-2‑methoxypropionyl group onto amines or alcohols.

4. Mechanistic Studies in Asymmetric Catalysis

Researchers studying the mechanism of asymmetric hydrogenation or epoxidation sometimes use isotopically labeled or simple chiral probes like this one to track stereochemical outcomes. Its small size minimizes steric interference, making it a clean model substrate.

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