2-(Benzyloxy)ethanol

 CAS No.: 622-08-2  Cat No.: BP-500502  Purity: ≥95% 4.5  

2-(Benzyloxy)ethanol is a bifunctional ether alcohol featuring a benzyloxy-protected hydroxyl motif connected through a two-carbon ethylene spacer, enabling controlled linkage formation in synthetic building blocks. In PROTAC construction, such ether alcohol linkers are commonly used to introduce a flexible, chemically addressable handle that can be converted into coupling-ready derivatives (e.g., activated esters or halides) and subsequently joined to ligands bearing complementary functional groups. The benzyloxy group can also serve as a removable protecting group strategy during multi-step assembly, allowing selective deprotection to reveal a reactive alcohol for final conjugation or for tuning physicochemical properties such as polarity and solubility. Its ether-based, short-chain architecture helps modulate linker flexibility and effective reach between the target-binding moiety and the E3 ligase ligand, which is critical for productive ternary complex formation. As a practical intermediate, it supports systematic linker optimization and efficient synthesis of degraders for mechanistic and structure–activity relationship studies.

2-(Benzyloxy)ethanol

Structure of 622-08-2

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Category
PROTAC Linker
Molecular Formula
C9H12O2
Molecular Weight
152.19
Related CAS
26403-74-7 (polymer) 1201808-31-2 (polymer)
Appearance
Colorless to Light Yellow Liquid

* For research and manufacturing use only. Not for human or clinical use.

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Popular Publications Citing BOC Sciences Products
Purity
≥95%
Solubility
Soluble in Chloroform (Slightly), Methanol (Slightly)
Appearance
Colorless to Light Yellow Liquid
Storage
Store at 2-8°C under inert atmosphere
Shipping
Room temperature in continental US; may vary elsewhere.
IUPACName
2-phenylmethoxyethanol
Synonyms
2-Benzyloxyethyl alcohol; Benzyl 2-hydroxyethyl ether; Benzyl-PEG2-alcohol; Benzyloxyethanol; BzG; Ethylene glycol benzyl ether; Ethylene glycol monobenzyl ether; Glycol monobenzyl ether; NSC 8886; Ethanol, 2-(phenylmethoxy)-; 2-Benzyloxy-1-ethanol; 2-(benzyloxy)ethan-1-ol; Benzyl cellosolve
Boiling Point
254.4±15.0°C at 760 mmHg
Melting Point
<-75°C
Density
1.071 g/mL at 25°C
InChI Key
CUZKCNWZBXLAJX-UHFFFAOYSA-N
InChI
InChI=1S/C9H12O2/c10-6-7-11-8-9-4-2-1-3-5-9/h1-5,10H,6-8H2
SMILES
C1=CC=C(C=C1)COCCO
1. An Intramolecular Hydroaminomethylation-Based Approach to Pyrrolizidine Alkaloids under Microwave-Assisted Heating
Elena Petricci, Simone Zurzolo, Camilla Matassini, Samuele Maramai, Francesca Cardona, Andrea Goti, Maurizio Taddei Molecules. 2022 Jul 25;27(15):4762. doi: 10.3390/molecules27154762.
A general method for the synthesis of pyrrolizidine derivatives using an intramolecular hydroaminomethylation protocol (HAM) under microwave (MW) dielectric heating is reported. Starting from a 3,4-bis(benzyloxy)-2-[(benzyloxy)methyl]-5-vinylpyrrolidine, MW-assisted intramolecular HAM in the presence of gaseous H2 and CO gave the natural alkaloid hyacinthacine A2 protected as benzyl ether. The same approach gave a lentiginosine analogue starting from the corresponding vinyl N-hydroxypyrrolidine. The nature of the reaction products and the yields were strongly influenced by the relative stereochemistry of the starting pyrrolidines, as well as by the catalyst/ligand employed. The use of ethanol as a solvent provides environmentally friendly conditions, while the ligand/catalyst system can be recovered by separating the alkaloid product with an SCX column and recycling the ethanolic solution. HAM worked up to three times with the recycled catalyst solution without any significant impact on yield.

2-(Benzyloxy)ethanol, provides a flexible ether-containing handle that can be used to connect and spatially tune small-molecule ligands in targeted protein degradation constructs. Its ether linkage and terminal alcohol functionality support robust synthetic modification strategies commonly employed in PROTAC assembly. The resulting linker architecture can help optimize linker length and conformational freedom to improve productive ternary complex formation, and the detailed structure and reactivity considerations are provided below.

Structure: The molecule contains a benzyloxy ether and a terminal primary alcohol, connected through an ethylene spacer. It features an aromatic benzyl group, ether oxygen atoms, and an alcohol capable of hydrogen bonding. Overall, it is a small, polar, oxygen-rich linker with ether and hydroxyl functional groups suitable for derivatization.

Reactivity: The terminal alcohol enables standard PROTAC linker functionalization via esterification or ether formation, typically using activated carboxylic acids or electrophiles under mild base conditions. For benzyl-protected alcohol strategies, hydrogenolysis or other deprotection methods can regenerate the free hydroxyl when needed. Common coupling approaches rely on nucleophilic substitution or acylation principles, with appropriate catalysts and dry, inert solvents to minimize side reactions.

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

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Tip: Chemical formula is case sensitive. C22H30N4O c22h30n40
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