Name: N-(Azido-PEG2)-N-Boc-PEG3-NHS ester
Brand: BOC Sciences
Rating: 5 (1 reviews)

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Purity

98%

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Please store the product under the recommended conditions in the Certificate of Analysis.

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Room temperature in continental US; may vary elsewhere.

IUPACName

(2,5-dioxopyrrolidin-1-yl) 3-[2-[2-[2-[2-[2-(2-azidoethoxy)ethoxy]ethyl-[(2-methylpropan-2-yl)oxycarbonyl]amino]ethoxy]ethoxy]ethoxy]propanoate

Synonyms

N-(AZIDO-PEG2)-N-BOC-PEG3-NHSESTER; 2,5-dioxopyrrolidin-1-yl 1-azido-9-(tert-butoxycarbonyl)-3,6,12,15,18-pentaoxa-9-azahenicosan-21-oate; 2,5-dioxopyrrolidin-1-yl 3-(2-{2-[2-(13-azido-2,2-dimethyl-4-oxo-3,8,11-trioxa-5-azatridecan-5-yl)ethoxy]ethoxy}ethoxy)propanoate

InChI Key

LICLIIAXFJFOMD-UHFFFAOYSA-N

InChI

InChI=1S/C24H41N5O11/c1-24(2,3)39-23(33)28(8-12-36-16-15-35-11-7-26-27-25)9-13-37-17-19-38-18-14-34-10-6-22(32)40-29-20(30)4-5-21(29)31/h4-19H2,1-3H3

SMILES

CC(C)(C)OC(=O)N(CCOCCOCCN=[N+]=[N-])CCOCCOCCOCCC(=O)ON1C(=O)CCC1=O

1. N-phosphoryl amino acids and biomolecular origins

C M Cheng, X H Liu, Y M Li, Y Ma, B Tan, R Wan, Y F Zhao Orig Life Evol Biosph. 2004 Oct;34(5):455-64.doi: 10.1023/b:orig.0000043122.97856.79.

The possible role of phosphoryl amino acids for biomolecular origins is briefly reviewed. Peptide formation, ester formation, ester exchange on phosphorus and N to O migration occurred when the N-phosphoryl amino acid was incubated at room temperature. Short nucleotides and peptides were formed when nucleoside was reacted with N-phosphoryl amino acid at room temperature. Serine and threonine residues in their conjugate with different nucleosides (mediated with phosphorus) showed different self-cleavage activities. N-phosphoryl Histine and Ser-His dipeptide could cleave nucleic acids, proteins and esters in neutral medium. Based on a simple model, a pathway of 'co-evolution of protein and nucleic acid' was proposed.

2. Prodrugs of the Archetypal Dynamin Inhibitor Bis-T-22

Luke R Odell, Mark J Robertson, Kelly A Young, Andrew B McGeachie, Annie Quan, Phillip J Robinson, Adam McCluskey ChemMedChem. 2022 Dec 16;17(24):e202200400.doi: 10.1002/cmdc.202200400.Epub 2022 Nov 9.

The Bis-T series of compounds comprise some of the most potent inhibitors of dynamin GTPase activity yet reported, e. g., (2E,2'E)-N,N'-(propane-1,3-diyl)bis(2-cyano-3-(3,4-dihydroxyphenyl)acrylamide) (2), Bis-T-22. The catechol moieties are believed to limit cell permeability, rendering these compounds largely inactive in cells. To solve this problem, a prodrug strategy was envisaged and eight ester analogues were synthesised. The shortest and bulkiest esters (acetate and butyl/tert-butyl) were found to be insoluble under physiological conditions, whilst the remaining five were soluble and stable under these conditions. These five were analysed for plasma stability and half-lives ranged from ~2.3 min (propionic ester 4), increasing with size and bulk, to greater than 24 hr (dimethyl carbamate 10). Similar profiles where observed with the rate of formation of Bis-T-22 with half-lives ranging from ~25 mins (propionic ester 4). Propionic ester 4 was chosen to undergo further testing and was found to inhibit endocytosis in a dose-dependent manner with IC50 ~8 μM, suggesting this compound is able to effectively cross the cell membrane where it is rapidly hydrolysed to the desired Bis-T-22 parent compound.

3. Selective protein N-terminal labeling with N-hydroxysuccinimide esters

Hanjie Jiang, Gabriel D D'Agostino, Philip A Cole, Daniel R Dempsey Methods Enzymol. 2020;639:333-353.doi: 10.1016/bs.mie.2020.04.018.Epub 2020 Apr 28.

In order to gain detailed insight into the biochemical behavior of proteins, researchers have developed chemical tools to incorporate new functionality into proteins beyond the canonical 20 amino acids. Important considerations regarding effective chemical modification of proteins include chemoselectivity, near stoichiometric labeling, and reaction conditions that maintain protein stability. Taking these factors into account, we discuss an N-terminal labeling strategy that employs a simple two-step "one-pot" method using N-hydroxysuccinimide (NHS) esters. The first step converts a R-NHS ester into a more chemoselective R-thioester. The second step reacts the in situ generated R-thioester with a protein that harbors an N-terminal cysteine to generate a new amide bond. This labeling reaction is selective for the N-terminus with high stoichiometry. Herein, we provide a detailed description of this method and further highlight its utility with a large protein (>100kDa) and labeling with a commonly used cyanine dye.

This N-(Azido-PEG2)-N-Boc-PEG3-NHS ester is a versatile PROTAC linker building block combining an NHS ester for efficient amide coupling, a Boc-protected amine for controlled downstream functionalization, and an azide handle for orthogonal conjugation. Its PEG-based architecture supports aqueous solubility and flexible spacing between ligands, which is advantageous for tuning ternary complex formation and targeted protein degradation. The detailed structural and reactivity characteristics are provided below.

Structure: The molecule contains polyethylene glycol segments separated by ether linkages, providing hydrophilic, flexible spacing. It bears an NHS ester for acyl transfer chemistry, a Boc-protected amine, and a terminal azide suitable for bioorthogonal reactions. The azide and ester functionalities are chemically distinct yet compatible in stepwise synthesis.

Reactivity: The NHS ester typically reacts with primary amines under mild, aqueous-compatible base conditions to form stable amide bonds, enabling conjugation to ligand-bearing amines. The Boc group allows temporary protection during coupling steps and can be removed using standard acid deprotection conditions when required. The azide can then participate in azide–alkyne cycloaddition or related azide chemistries, using appropriate catalysts and solvent systems compatible with sensitive PROTAC components.

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Concentration (start) x Volume (start) = Concentration (final) x Volume (final)
It is commonly abbreviated as: C₁V₁ = C₂V₂