7-Methoxyindole is an indole derivative carrying a methoxy group at the 7-position, that is, on the benzene ring carbon adjacent to the pyrrole nitrogen atom. The compound serves as a heterocyclic building block for constructing more complex molecules, particularly when a target design calls for an oxygen substitution pattern on the benzenoid portion of the indole framework. Supplying the methoxy substituent from the starting material onward is considerably more efficient than introducing it midway through a synthetic route, because directed substitution on the benzene ring of indole normally demands additional protection, activation, and purification steps that consume significant time.
The advantages that make this compound a preferred choice are the electronic and steric influence of the methoxy group. As an electron-donating group, methoxy raises the electron density of the ring, thereby affecting the rate and direction of electrophilic substitution reactions, while simultaneously shifting the absorption and emission properties of derived compounds — a characteristic that proves valuable in fluorescent probe research. Its placement at the 7-position also situates it close to the indole N-H, giving a distinctive steric environment and the possibility of characteristic intramolecular interactions. The methoxy group may be retained as a permanent feature of the final molecule, or it may serve as a masked handle for later transformation.
In Indonesian laboratories, 7-Methoxyindole is typically handled in organic synthesis and medicinal chemistry groups at universities, government research institutes, and industrial R&D units working on heterocyclic scaffolds. It is used at small to moderate scale in route development, where a substituted indole core shortens the path to a target molecule. Researchers generally weigh it out for multi-step sequences, characterise intermediates by standard spectroscopic methods, and return the remainder of the container to controlled storage between experimental campaigns.
- Heterocyclic scaffold synthesis: the pre-installed 7-methoxy group removes the need for late-stage directed substitution on the indole benzene ring, shortening routes and reducing the number of protection and purification steps required.
- Medicinal chemistry route development: chemists exploring indole-based structure–activity relationships use it to access analogues bearing benzenoid oxygen substitution without redesigning the synthesis around a difficult functionalisation step.
- Fluorescent probe research: because the electron-donating methoxy group shifts the absorption and emission behaviour of derived compounds, this building block is well suited to preparing indole-based chromophores for photophysical study.
- Electrophilic substitution studies: the increased ring electron density imparted by the methoxy substituent makes this compound a useful substrate for investigating the rate and regiochemical outcome of electrophilic reactions on indoles.
- Masked phenol chemistry: the methoxy group can be carried through a sequence and later unmasked, allowing researchers to introduce a free hydroxyl at the 7-position at the most convenient point in a route.
| Brand | TCI (Tokyo Chemical Industry) |
|---|---|
| CAS number | 3189-22-8 |
| Molecular formula | — |
| Purity | — |
| Category | Chemistry > Building Blocks > Heterocyclic Building Blocks |
| Pack sizes | supplied in standard TCI research-scale packaging; please confirm the available pack size when ordering |
| Physical form | — |
| Storage | keep in a cool, dry place in the tightly closed original container, following the storage guidance on the manufacturer's label |
- Catalogue code: M1751
Store 7-Methoxyindole in its tightly closed original container in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and strong oxidising agents. Keep containers sealed when not in use to limit exposure to air and moisture, and observe the storage temperature stated on the manufacturer's label. Handle the material inside a functioning fume hood, wearing safety goggles, chemical-resistant gloves, and a laboratory coat. Use clean, dry spatulas and glassware when weighing to avoid cross-contamination of the stock. Avoid generating dust, do not eat or drink in the handling area, and wash hands thoroughly after use. Consult the manufacturer's Safety Data Sheet before first use, and dispose of residues and contaminated materials through the institution's approved chemical waste channel.
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