Description

Fmoc-N-Me-Gln(Trt)-OH (CAS 1632075-13-8): Advanced SPPS Reagent & Technical Guide

In modern solid-phase peptide synthesis (SPPS), chemical biology, and peptidomimetic engineering, controlling peptide backbone conformation and enzymatic stability represents a primary design goal. Incorporating $N^\alpha$-methylated amino acid derivatives allows synthetic chemists to eliminate amide hydrogen-bond donors, disrupt interchain self-assembly, and improve biological half-life. Among these specialized reagents, Fmoc-N-Me-Gln(Trt)-OH (CAS 1632075-13-8) serves as an essential orthogonal building block for introducing backbone-modified glutamine residues into complex peptide sequences.

Glutamine contains a polar side-chain primary amide group that is susceptible to dehydration, nitrile formation, or deamidation if unshielded during synthesis cycles. For research facilities seeking to evaluate Fmoc-N-Me-Gln(Trt)-OH CAS 1632075-13-8 price structure and secure a validated buy Fmoc-N-Me-Gln(Trt)-OH supplier, acquiring analytical-grade reagents from amino asylum ensures high coupling efficiency, structural fidelity, and reproducible batch-to-batch performance.

What is Fmoc-N-Me-Gln(Trt)-OH (Fmoc-N-methyl-L-glutamine(Trt))?

Fmoc-N-Me-Gln(Trt)-OH, chemically designated as $N^\alpha$-(((9H-fluoren-9-yl)methoxy)carbonyl)-$N^\alpha$-methyl-$N^\gamma$-trityl-$L$-glutamine, is an $N^\alpha$-methylated, side-chain protected amino acid derivative engineered for standard Fmoc/tBu SPPS protocols.

Substituting a methyl group onto the $\alpha$-amino nitrogen converts a standard secondary amide linkage into a tertiary amide within the peptide backbone. This modification alters local steric parameters, removes a hydrogen-bond donor site, and shifts the cis/trans amide bond equilibrium toward defined secondary structures.

                 [ Fmoc-N-Me-Gln(Trt)-OH Chemical Architecture ]
                                        │
        ┌───────────────────────────────┼───────────────────────────────┐
        ▼                               ▼                               ▼
[ Base-Labile Fmoc ]           [ N-Methylated Nitrogen ]       [ Acid-Labile Trt Amide Shield ]
(Alpha-Amine Protection)       (Eliminates H-Bond Donor)       (Gamma-Amide Side-Chain)
        │                               │                               │
        ▼                               ▼                               ▼
 Deprotects via 20%             Prevents Beta-Sheets &          Prevents Dehydration &
 Piperidine in DMF              Resin Aggregation               Deamidation Side-Reactions

Molecular Architecture & Chemical Identity of CAS 1632075-13-8

The chemical parameters of CAS 1632075-13-8 define its utility as a core building block for custom peptide modification:

Chemical Specifications Reference:
• Full Chemical Name: N-alpha-(((9H-fluoren-9-yl)methoxy)carbonyl)-N-alpha-methyl-N-gamma-trityl-L-glutamine
• CAS Registry Number: 1632075-13-8
• Common Nomenclature: Fmoc-N-methyl-L-glutamine(Trt)
• Abbreviated Name: Fmoc-N-Me-Gln(Trt)-OH / Fmoc-MeGln(Trt)-OH
• Molecular Formula: C40H36N2O5
• Molecular Weight: 624.74 g/mol
• Protect Group Matrix: N-alpha (Fmoc, base-labile), Gamma-Amide (Trityl/Trt, acid-labile)
• Physical State: Off-white to white powder
• Storage Parameters: Refrigerated (-20°C to 4°C), desiccated, sheltered from light

Orthogonal Protection Chemistry: Fmoc and Trityl (Trt) Amide Shielding

Base-Labile N-alpha Fmoc Deprotection Dynamics

The 9-Fluorenylmethyloxycarbonyl (Fmoc) group protects the $N^\alpha$-methylated amine during storage and coupling steps. Deprotection proceeds efficiently via base-catalyzed $E1cB$ elimination using $20\%$ piperidine in DMF, yielding a secondary $N^\alpha$-methylamine ready for subsequent elongation cycles without affecting acid-sensitive side-chain protecting groups.

Acid-Labile Side-Chain Trityl Protection and Suppression of Deamidation

The primary amide on the glutamine $\gamma$-carbon is shielded by a bulky Triphenylmethyl (Trityl / Trt) group. This bulky group prevents side reactions during peptide assembly, such as base-catalyzed dehydration to cyano side chains or cyclization into glutarimide structures. The Trt group remains intact during base deprotection steps and is removed during final trifluoroacetic acid (TFA) cleavage.

Applications of Fmoc-N-methyl-L-glutamine(Trt) Bulk Manufacturer Reagents in SPPS

                            [ SPPS Assembly Kinetics ]
                                        │
        ┌───────────────────────────────┴───────────────────────────────┐
        ▼                                                               ▼
[ Unmodified Sequence Assembly ]                             [ N-Methylated Insertion ]
        │                                                               │
        ▼                                                               ▼
[ Interchain H-Bonded Beta-Sheets ]                          [ Steric Backbone Disruption ]
        │                                                               │
        ▼                                                               ▼
[ Premature Termination / Low Yield ]                        [ Solvated Resin / High Coupling Yield ]

Backbone Methylation and Elimination of Beta-Sheet Self-Assembly

During long-chain SPPS, peptide chains often establish interchain hydrogen bonds between backbone amide protons ($\text{-NH-}$) and carbonyl oxygens ($\text{-C=O}$). This interaction can cause hydrophobic $\beta$-sheet aggregation on the resin support, shrinking resin matrix pores and limiting reagent access to the terminal amine.

Utilizing building blocks sourced from a verified Fmoc-N-methyl-L-glutamine(Trt) bulk manufacturer removes the amide hydrogen at the target locus. Inserting Fmoc-N-Me-Gln(Trt)-OH breaks up local $\beta$-sheet secondary structures, preserving resin swelling and improving step-wise coupling yields in difficult sequences.

Enhancing Peptide Pharmacokinetics: Proteolytic Resistance and Metabolic Stability

$N^\alpha$-methylation provides defined pharmacokinetic advantages in peptidomimetic design:

• Enzymatic Shielding: The $N^\alpha$-methyl group sterically blocks cleavage by serum endopeptidases and exopeptidases, increasing compound half-life in biological assays.

• Membrane Permeability: Removing a polar hydrogen-bond donor lowers the desolvation energy barrier, aiding passive trans-epithelial and trans-mucosal transport across biological membranes.

Methodological Protocols: What Is the Coupling Procedure for Fmoc-N-Me-Gln(Trt)-OH?

Overcoming Steric Hindrance During Hindered Amide Bond Formation

When investigating what is the coupling procedure for Fmoc-N-Me-Gln(Trt)-OH, synthesis teams must account for two distinct steric challenges: coupling Fmoc-N-Me-Gln(Trt)-OH onto a growing resin-bound amine, and coupling a subsequent amino acid onto the sterically hindered $N^\alpha$-methylamine of Gln(Trt).

Optimized Coupling Parameters for Fmoc-N-Me-Gln(Trt)-OH:
1. Primary Activation System: HATU (5 eq) / HOAt (5 eq) or COMU (5 eq) with DIPEA (10 eq).
2. Alternative Activation: DIC (5 eq) / Oxyma Pure (5 eq) for suppressed racemization.
3. Extended Reaction Times: Double coupling (2 x 60 min) at ambient temperature or controlled microwave heating (50°C for 30 min).
4. Solvent System: NMP/DMF (1:1 v/v) mixtures to optimize resin solvation.
5. Verification: Perform a Micro-Kaiser test or Chloranil test to verify quantitative coupling before Fmoc removal.

Preventing Dehydration, Glutarimide Side-Products, and TFA Cleavage Protocols

Side-chain Trityl protection prevents intramolecular cyclization during repeated piperidine exposure. During final cleavage, the following protocol minimizes side reactions:

• Cleavage Cocktail Composition: $\text{TFA} / \text{TIS} / \text{H}_2\text{O}$ ($95:2.5:2.5 \text{ v/v/v}$).

• Scavenger Function: Triisopropylsilane ($\text{TIS}$) traps liberated trityl carbocations ($\text{Trt}^+$), preventing re-alkylation of the glutamine side chain or neighboring electron-rich residues (such as Trp, Cys, or Tyr).

Comparative Analysis & Catalog Integration

Comparing N-Methyl Glutamine Building Blocks with Fmoc-N-Me-His(Trt)-OH and Protected Derivatives

Integrating Fmoc-N-Me-Gln(Trt)-OH alongside other $N^\alpha$-methylated derivatives—such as Fmoc-N-Me-His(Trt)-OH—provides synthetic chemists with a functional toolset to modify both neutral polar and basic positions within target peptide sequences.

                      [ Reagent Sourcing to Finished Research ]
                                         │
     ┌───────────────────────────────────┼───────────────────────────────────┐
     ▼                                   ▼                                   ▼
[ Chemical Synthesis Blocks ]   [ Stabilized Neuropeptides ]        [ Metabolic & Repair Compounds ]
 • Fmoc-N-Me-Gln(Trt)-OH        • N-Acetyl-Semax Spray              • Buy Noopept
 • Fmoc-N-Me-His(Trt)-OH        • N-Acetyl-Selank Spray             • NAD+ Spray
                                • PT-141 Spray / MT-II Spray        • glutathione spray
                                                                    • BPC-157 Spray / AOD-9604 Spray

From Chemical Synthesis to Bioactive Formulations

Laboratory workflows bridge raw reagent synthesis and post-synthesis empirical research. Chemical strategies evaluated during solid-phase assembly directly inform research on finished reference products:

• Cognitive & Nootropic Protocols: Custom peptide synthesis data complement evaluations of established central dipeptides like Buy Noopept.

• Cellular Bioenergetics & Redox: Synthetic design projects frequently run alongside investigations into cellular energy catalysts like NAD+ Spray and endogenous antioxidants like glutathione spray.

• Tissue Repair & Metabolic Signaling: Advanced peptide research pairs custom-synthesized chains with functional reference compounds like BPC-157 Spray and lipolytic fragments such as AOD-9604 Spray.

• Melanocortin & Neuropeptide Pathways: Structural stabilization techniques mirror protocols used in specialized research products, including melanocortin agonists like PT-141 Spray and MT-II Spray, as well as stabilized intranasal neuropeptides like N-Acetyl-Semax Spray and N-Acetyl-Selank Spray.

Sourcing Reagents: Where to Buy Fmoc-N-Me-Gln(Trt)-OH for Peptide Synthesis

When determining where to buy Fmoc-N-Me-Gln(Trt)-OH for peptide synthesis, procurement managers evaluate analytical purity, batch consistency, and supplier verification.

Evaluating Fmoc-N-Me-Gln(Trt)-OH CAS 1632075-13-8 Price and Quality Standards

Reagent purity directly impacts crude peptide assembly quality and downstream purification workloads. Every batch of Fmoc-N-Me-Gln(Trt)-OH (CAS 1632075-13-8) supplied by Amino Asylum undergoes full analytical quality testing:

• High-Performance Liquid Chromatography (HPLC): Confirms chemical purity ($\ge 98.0\%$).

• Proton Nuclear Magnetic Resonance ($^1\text{H-NMR}$): Verifies correct structural assignment of the Fmoc group, $N^\alpha$-methyl group, and side-chain Trt protecting group without unassigned impurities.

• Mass Spectrometry (MS): Validates precise molecular weight ($624.74\text{ g/mol}$).

Selecting a Reliable Buy Fmoc-N-Me-Gln(Trt)-OH Supplier at Amino Asylum

Laboratories securing reagents through a verified buy Fmoc-N-Me-Gln(Trt)-OH supplier like amino asylum receive high-purity, batch-tested synthesis building blocks backed by analytical documentation and reliable fulfillment.

Frequently Asked Questions (FAQ)

What Is the Exact IUPAC Nomenclature for Fmoc-N-methyl-L-glutamine(Trt)?

The full chemical name is $N^\alpha$-(((9H-fluoren-9-yl)methoxy)carbonyl)-$N^\alpha$-methyl-$N^\gamma$-trityl-$L$-glutamine, indexed under CAS 1632075-13-8 and abbreviated as Fmoc-N-Me-Gln(Trt)-OH or Fmoc-MeGln(Trt)-OH.

How Does Side-Chain Trityl Protection Shield the Primary Amide During Deprotection?

The steric bulk of the Triphenylmethyl ($\text{Trt}$) group prevents base-catalyzed dehydration of the primary $\gamma$-amide into a nitrile during repeated piperidine treatments.

What Storage Guidelines Maintain the Purity of CAS 1632075-13-8 Reagents?

Store dry powders long-term at $-20^\circ\text{C}$ in tightly sealed, desiccated containers protected from light to prevent slow hydrolysis or moisture absorption.

Final Verdict: Sourcing High-Purity Fmoc-N-Me-Gln(Trt)-OH for Research

Optimizing peptide assembly, overcoming secondary aggregation, and engineering backbone stability require analytical-grade chemical building blocks. Fmoc-N-Me-Gln(Trt)-OH (CAS 1632075-13-8) provides the structural control necessary for incorporating protected $N^\alpha$-methylated glutamine residues into custom SPPS sequences.

When evaluating Fmoc-N-Me-Gln(Trt)-OH CAS 1632075-13-8 price options or selecting a verified supplier for your laboratory, amino asylum delivers batch-verified purity, detailed analytical documentation, and consistent fulfillment to support your custom synthesis protocols.