Fmoc-N-Me-Trp(Boc)-OH

Fmoc-N-Me-Trp(Boc)-OH is a protected N-methyl tryptophan derivative serving as a building block for introducing N-α-methyl-tryptophan residues via Fmoc solid-phase peptide synthesis (SPPS). Fmoc-N-Me-Trp(Boc)-OH features dual protecting groups — Fmoc and Boc — facilitating selective deprotection in advanced SPPS protocols. The compound has been used to synthesize peptide antibiotics with antibacterial activity against Pseudomonas aeruginosa, demonstrating its value in antimicrobial peptide discovery. The N-methylation at the α-position introduces backbone rigidity and enhances proteolytic stability while reducing hydrogen bonding capacity, making Fmoc-N-Me-Trp(Boc)-OH particularly useful in constructing macrocyclic β-hairpin peptidomimetics.

Product Parameters

Synthetic Route

The synthesis of Fmoc-N-Me-Trp(Boc)-OH typically involves two sequential protection steps: (1) Fmoc protection of the α-amino group of N-methyl-tryptophan using Fmoc chloride in the presence of a base such as sodium carbonate, and (2) Boc protection of the indole side chain using Boc anhydride in the presence of a base like triethylamine. Industrial production follows similar synthetic routes on larger scale, with reactions optimized for higher yields and purity, often involving automated synthesizers and advanced purification techniques such as preparative HPLC.

FAQ

Q1: What does Fmoc-N-Me-Trp(Boc)-OH stand for?

A: Fmoc-N-Me-Trp(Boc)-OH is N-α-(9-fluorenylmethoxycarbonyl)-N-α-methyl-N-in-tert-butoxycarbonyl-L-tryptophan. Fmoc protects the α-amino group, N-Me indicates methylation at the α-nitrogen, Trp indicates tryptophan, Boc protects the indole nitrogen, and OH refers to the free carboxylic acid.

Q2: Why is the N-methyl group important?

A: The N-methyl group at the α-position introduces a tertiary amide bond when Fmoc-N-Me-Trp(Boc)-OH is incorporated into peptides. This modification reduces backbone hydrogen bonding, restricts conformational flexibility, and enhances proteolytic stability — properties critical for designing bioactive peptidomimetics and therapeutic peptides.

Application Scenarios

Antibacterial Peptide Synthesis against P. aeruginosa

Fmoc-N-Me-Trp(Boc)-OH has been used to synthesize peptide antibiotics with antibacterial activity against Pseudomonas aeruginosa, a notoriously drug-resistant pathogen responsible for hospital-acquired infections. N-methylation at tryptophan positions contributes to enhanced antibacterial potency.

Macrocyclic β‑Hairpin Peptidomimetic Antibiotics

The compound is a key building block for constructing macrocyclic β‑hairpin peptidomimetics, where N-methylated tryptophan residues induce specific β‑turn conformations critical for antimicrobial activity.

N‑Methylated Peptide Library Synthesis

Fmoc-N-Me-Trp(Boc)-OH is used in solid-phase peptide synthesis to generate N‑methylated peptide libraries for structure-activity relationship (SAR) studies, enabling identification of bioactive peptides with enhanced metabolic stability.

Proteolytically Stable Therapeutic Peptide Development

The N-methyl group at the α-position significantly enhances resistance to proteolytic degradation. Fmoc-N-Me-Trp(Boc)-OH enables development of therapeutic peptides with extended in vivo half-lives for chronic disease treatment.

Fmoc SPPS for Peptidomimetics

Fmoc-N-Me-Trp(Boc)-OH is a standard building block in Fmoc-based SPPS for constructing peptidomimetics — compounds that mimic peptide structures but offer improved pharmacological properties.

Process Development & Scale‑Up

Pharmaceutical process chemists use Fmoc-N-Me-Trp(Boc)-OH for coupling optimization and development of scalable manufacturing routes for peptide-based therapeutics requiring backbone N-methylation.

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