3-Iodo-4-methylbenzoic acid

3-Iodo-4-methylbenzoic acid is a versatile aryl iodide building block that has found widespread application in medicinal chemistry and radiopharmaceutical research. The key structural feature of 3-Iodo-4-methylbenzoic acid is the iodine atom at the 3‑position, which serves as a reactive handle for palladium‑catalyzed cross‑coupling reactions, enabling the introduction of diverse aryl, heteroaryl, alkynyl, and amino substituents. 3-Iodo-4-methylbenzoic acid has been specifically utilized in the preparation of unlabeled N‑succinimidyl 4‑guanidinomethyl‑3‑iodobenzoate (SGIMB) and its Boc‑protected derivative (Boc‑SGMIB), which are important reagents in radioiodination chemistry for protein labeling. Additionally, 3-Iodo-4-methylbenzoic acid is recognized as a pharmaceutical intermediate and has been listed as a ponatinib impurity (Ponatinib Impurity 7). The compound‘s carboxylic acid functionality provides an additional point for amide coupling or esterification, further expanding its utility in complex molecule construction. 3-Iodo-4-methylbenzoic acid is also known as 3‑iodo‑p‑toluic acid and is classified as an aryl iodide building block.

Product Parameters

Application

3-Iodo-4-methylbenzoic acid can be used to prepare key intermediates for pesticides, fungicides and pharmaceuticals. In organic synthesis and transformation, the carboxyl group in the structure can be reduced to a hydroxyl group by lithium aluminum hydride or borane tetrahydrofuran solution. In addition, the carboxyl group can also react with alcohols or amine compounds to be converted into ester groups and amide groups. The iodine atom in the structure can undergo arylation or alkylation reactions via coupling.

Synthetic Route

Dissolve methyl 3-iodo-4-methylbenzoate (3 g, 109 mmol, 1 equivalent) in methanol (30 mL), carefully add sodium hydroxide (1.3 g, 327 mmol, 3 equivalents), then add water (15 mL). Note that the exothermic effect is obvious. Stir the above reaction solution at room temperature for 14 hours, concentrate under vacuum, then add water, adjust the pH of the reaction to 3 with concentrated hydrochloric acid. The obtained solid is filtered and dried under vacuum to obtain the target product molecule.

Product Advantages

 Versatile Aryl Iodide Building Block

The iodine atom in 3-Iodo-4-methylbenzoic acid serves as a versatile handle for palladium‑catalyzed cross‑coupling reactions including Suzuki–Miyaura, Sonogashira, and Buchwald–Hartwig couplings, enabling rapid SAR exploration.

 Radioiodination Chemistry Applications

3-Iodo-4-methylbenzoic acid has been specifically utilized in the preparation of unlabeled N‑succinimidyl 4‑guanidinomethyl‑3‑iodobenzoate (SGIMB) and its Boc‑protected derivative (Boc‑SGMIB) for protein labeling applications.

 Pharmaceutical Intermediate and Impurity Standard

3-Iodo-4-methylbenzoic acid is recognized as a pharmaceutical intermediate and has been listed as Ponatinib Impurity 7, making it valuable for quality control and analytical method development.

 Established Synthetic Utility

3-Iodo-4-methylbenzoic acid has been used in the preparation of various biologically active compounds via amide coupling and cross‑coupling reactions.

 Light‑Sensitive — Handle with Care

3-Iodo-4-methylbenzoic acid is light‑sensitive and should be protected from light during storage and handling, ensuring integrity for sensitive research applications.

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