Ac-Asn(Trt)-OH is N-alpha-acetyl, N-gamma-trityl-protected L-asparagine. Its protection pattern is different from a standard Fmoc amino acid: the alpha amino group is already acetylated, while the asparagine side-chain amide is protected with trityl (Trt).

Because the alpha amine is capped, Ac-Asn(Trt)-OH is most useful as a terminal or fragment building block when the final sequence is intended to contain N-acetyl-Asn. It should not be treated as a routine chain-extension monomer that will undergo another N-terminal coupling after incorporation.

Product Information

Why Use Ac-Asn(Trt)-OH?

Direct use of a pre-acetylated amino-acid building block can simplify synthesis when N-terminal acetylation and residue identity must be fixed in advance. The Trt group protects the asparagine side-chain amide during peptide coupling and is compatible with acid-labile global deprotection strategies.

Terminal-Residue and Fragment Applications

Typical uses include preparation of N-acetylated peptide standards, protected fragments, modified peptide libraries and sequences where N-terminal acetylation is part of the target molecular identity. Because the alpha nitrogen is acetylated, this building block is normally positioned at the terminus rather than within a chain that must continue growing through that nitrogen.

Asn-Specific Synthesis Considerations

Asparagine derivatives can be sensitive to sequence context and activation conditions. The Trt side-chain protection helps control unwanted side-chain chemistry, but coupling conditions should still be selected with attention to neighboring residues, reaction time and deprotection strategy.

Downstream Assay Relevance

Final peptides containing N-acetyl-Asn may be used in biochemical, binding, stability or cell-based studies where N-terminal acetylation is relevant. The protected building block itself is a synthetic intermediate and is not intended for direct in vitro or in vivo use.

Product Documents

A Material Safety Data Sheet (MSDS) is available for this product to support laboratory handling, storage and safety assessment.

MSDS_Ac-Asn-Trt--OH_AS4038

Certificates of Analysis (COAs) are batch-specific. Please contact us to request the COA for your product, and we will provide it by email.

Frequently Asked Questions

Can Ac-Asn(Trt)-OH be used for routine chain elongation?

Not in the same way as Fmoc-Asn(Trt)-OH. Its alpha amino group is already acetylated, so it is mainly suited to terminal or fragment applications.

What does Trt protect?

Trt protects the asparagine side-chain amide nitrogen during synthesis.

Why use a pre-acetylated Asn building block?

It provides direct control over N-terminal acetylation and can reduce a separate post-assembly acetylation step when the synthesis route is designed around terminal Ac-Asn.

Related Technical Resources

Explore Specialty Peptide Building Blocks and Custom Peptide Synthesis.

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