tert-Butyl (2-(bromomethyl)phenyl)carbamate: Key FAQs
tert-Butyl (2-(bromomethyl)phenyl)carbamate: Key FAQs
tert-Butyl (2-(bromomethyl)phenyl)carbamate is a versatile Boc-protected ortho-aminobenzyl bromide building block widely employed in organic synthesis as an electrophilic alkylating agent for the construction of nitrogen-containing heterocycles and complex pharmaceutical intermediates.
- Product Name
- tert-Butyl (2-(bromomethyl)phenyl)carbamate
- SKU
- T724763
- Functional Groups
- Boc-protected amine and benzyl bromide
- Primary Application
- Electrophilic alkylating agent and building block in organic synthesis
- Key Reactivity
- The benzylic C–Br bond is highly reactive toward nucleophilic substitution (SN2); the Boc group protects the amine and can be removed under mild acidic conditions
- Supplier
- Aladdin Scientific
What Is tert-Butyl (2-(bromomethyl)phenyl)carbamate and What Are Its Key Features?
tert-Butyl (2-(bromomethyl)phenyl)carbamate (SKU: T724763) is an ortho-substituted aromatic compound carrying two orthogonal reactive handles: a benzylic bromide and a Boc (tert-butoxycarbonyl)-protected primary amine on the adjacent ring position. This combination makes the molecule a bifunctional building block particularly suited to sequential synthetic strategies.
The benzylic bromide is an activated electrophile due to resonance stabilization of the transition state, making it highly reactive toward a wide range of nucleophiles including amines, thiols, alcohols, malonates, and organometallic species under mild conditions. The Boc carbamate group simultaneously masks the aniline nitrogen, preventing unwanted side reactions during alkylation steps and enabling selective deprotection with dilute acid (e.g., trifluoroacetic acid in dichloromethane or HCl in dioxane) to reveal the free amine at a later synthetic stage.
Together, these features render this compound a valuable intermediate for the synthesis of isoindoline, benzazepine, isoquinoline, and other nitrogen-containing ring systems, as well as acyclic pharmaceutical intermediates.
How Should tert-Butyl (2-(bromomethyl)phenyl)carbamate Be Stored and Handled?
Storage: As a benzylic bromide, this compound is moisture-sensitive and should be stored in a tightly sealed container under an inert atmosphere (nitrogen or argon) in a cool, dry environment. Refrigerated storage (2–8 °C) is generally recommended to minimize slow decomposition or hydrolysis of the benzylic C–Br bond. Avoid prolonged exposure to light, moisture, and elevated temperatures.
Handling: Standard laboratory precautions for reactive alkyl halides apply. Work in a well-ventilated fume hood and wear appropriate PPE including nitrile gloves, safety glasses, and a lab coat. Benzylic bromides can be lachrymatory and skin-sensitizing; avoid inhalation of vapors or dust. Consult the Safety Data Sheet (SDS) for comprehensive hazard information before use.
Stability: The Boc group is stable under neutral and basic conditions but will be cleaved by strong acids or prolonged heating. Avoid storing with protic solvents or aqueous reagents. Under recommended conditions, the compound is expected to be stable for an extended period; however, users should verify purity (e.g., by TLC or NMR) before use in sensitive applications.
What Are the Typical Synthetic Applications of This Building Block?
tert-Butyl (2-(bromomethyl)phenyl)carbamate serves as a key electrophilic partner in a variety of synthetic transformations:
- N-Alkylation: The benzyl bromide reacts with secondary amines, nitrogen heterocycles, or amine equivalents to introduce the 2-(Boc-aminophenyl)methyl moiety. Subsequent Boc removal and intramolecular cyclization can yield isoindoline scaffolds.
- C-Alkylation: Active methylene compounds (e.g., malonates, cyanoacetates) undergo base-promoted alkylation to form C–C bonds.
- Thioether and Ether Formation: Thiols and alkoxides react smoothly under mild basic conditions to give thioethers and benzyl ethers, respectively.
- Cross-Coupling Precursors: After functional group manipulation, the aromatic ring bearing the Boc-amino group can participate in metal-catalyzed cross-coupling reactions.
- Heterocycle Synthesis: The ortho relationship between the bromomethyl group and the protected amine is exploited for ring-closure reactions to access pharmaceutically relevant scaffolds such as isoindolines, benzodiazepines, and isoquinolinones.
This compound is particularly prevalent as an intermediate in medicinal chemistry programs targeting kinases, GPCRs, and other drug targets where nitrogen-containing bicyclic motifs are common pharmacophores.
How Can I Order tert-Butyl (2-(bromomethyl)phenyl)carbamate from Aladdin Scientific?
tert-Butyl (2-(bromomethyl)phenyl)carbamate is available from Aladdin Scientific under SKU T724763. To place an order:
- Search for SKU T724763 directly on the Aladdin Scientific website to access current pricing, available pack sizes, and stock status.
- Add the desired quantity to your cart and proceed through the standard checkout process, selecting your preferred payment method and shipping option.
- For bulk quantities, custom pack sizes, or institutional purchasing agreements, contact the Aladdin Scientific sales team directly for a quotation.
- Registered account holders can track orders, access invoices, and manage reorders through the online account portal.
If you require a Certificate of Analysis (CoA), Safety Data Sheet (SDS), or additional technical documentation, these are typically available for download on the product page or upon request from customer service.
Frequently asked questions
What nucleophiles react well with the benzylic bromide in this compound?
The benzylic bromide in tert-Butyl (2-(bromomethyl)phenyl)carbamate is highly reactive toward soft and hard nucleophiles alike, including primary and secondary amines, thiols, alkoxides, stabilized carbanions (e.g., from malonates or cyanoacetates), and azide. Reactions are typically performed in polar aprotic solvents such as DMF, acetonitrile, or THF in the presence of a mild base (e.g., K2CO3 or Et3N) at room temperature or with gentle warming.
How is the Boc protecting group removed after the alkylation step?
The Boc group is most commonly removed using trifluoroacetic acid (TFA) in dichloromethane (typically 20–50% v/v, room temperature, 30 min to 2 h) or 4 M HCl in dioxane. Both conditions are mild enough to preserve other sensitive functional groups in most substrates. The resulting free amine is obtained as its TFA or HCl salt, which can be neutralized prior to further reactions.
Is tert-Butyl (2-(bromomethyl)phenyl)carbamate suitable for use in palladium-catalyzed cross-coupling reactions?
The compound itself is not a classical cross-coupling partner (it lacks an aryl halide or boronic acid); however, the aromatic ring bearing the Boc-amino group can be functionalized by electrophilic aromatic substitution or directed metalation prior to coupling. Additionally, products derived from alkylation of this building block may contain functional handles suitable for subsequent Suzuki, Negishi, or Buchwald–Hartwig couplings. Researchers should evaluate compatibility of the Boc group and benzylic C–Br bond with specific catalytic conditions.
What is the significance of the ortho relationship between the bromomethyl and Boc-amino groups?
The ortho configuration places the electrophilic benzyl bromide in close proximity to the protected amine nitrogen. Upon Boc deprotection, the free amine is ideally positioned for intramolecular cyclization with electrophiles introduced at the methylene carbon, facilitating efficient ring closure to form five- or six-membered nitrogen-containing heterocycles such as isoindolines or benzodiazepines. This geometric constraint is a key design feature exploited in target-oriented synthesis.
What analytical methods are recommended to confirm purity before use?
For routine quality checks, thin-layer chromatography (TLC) with UV visualization is a rapid first assessment. For quantitative purity determination, reverse-phase HPLC or GC is recommended. Structural confirmation should be performed by 1H NMR and 13C NMR spectroscopy, and the presence of the benzylic bromide can be further confirmed by mass spectrometry. A Certificate of Analysis (CoA) for the specific lot is available from Aladdin Scientific and should be reviewed prior to use in critical applications.
References
- Greene, T. W.; Wuts, P. G. M. Protective Groups in Organic Synthesis, 4th ed.; Wiley-Interscience: New York, 2007. (General reference for Boc protecting group chemistry.)
- March, J. Advanced Organic Chemistry: Reactions, Mechanisms, and Structure, 5th ed.; Wiley: New York, 2001. (General reference for SN2 reactivity of benzylic halides.)
- Aladdin Scientific product page for tert-Butyl (2-(bromomethyl)phenyl)carbamate, SKU T724763.
Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.
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