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Pomalidomide-4-piperidine-C1-piperazine hydrochloride

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2-(2,6-Dioxopiperidin-3-yl)-4-(4-(piperazin-1-ylmethyl)piperidin-1-yl)isoindoline-1,3-dione hydrochloride, Crosslinker−E3 ligase ligand conjugate, Protein degrader building block
Empirical Formula (Hill Notation):
C23H29N5O4 · xHCl
Molecular Weight:
439.51 (free base basis)

reaction suitability

reactivity: carboxyl reactive
reagent type: ligand-linker conjugate

Quality Level

functional group


storage temp.


SMILES string



Protein degrader building block Pomalidomide-4-piperidine-C1-piperazine hydrochloride enables the synthesis of molecules for targeted protein degradation and PROTAC® (proteolysis-targeting chimeras) research. This conjugate contains a Cereblon (CRBN) recruiting ligand, a rigid linker, and a pendant amine for reactivity with a carboxylic acid on the target ligand. Because even slight alterations in ligands and crosslinkers can affect ternary complex formation between the target, E3 ligase, and degrader, many analogs are prepared to screen for optimal target degradation. When used with other protein degrader building blocks with a terminal amine, parallel synthesis can be used to more quickly generate degrader libraries that feature variation in crosslinker length, composition, and E3 ligase ligand.

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Legal Information

PROTAC is a registered trademark of Arvinas Operations, Inc., and is used under license

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Health hazard




Hazard Classifications

Repr. 1B

Storage Class

6.1C - Combustible, acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects




Not applicable


Not applicable

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Daniel P Bondeson et al.
Annual review of pharmacology and toxicology, 57, 107-123 (2016-10-13)
Protein homeostasis networks are highly regulated systems responsible for maintaining the health and productivity of cells. Whereas therapeutics have been developed to disrupt protein homeostasis, more recently identified techniques have been used to repurpose homeostatic networks to effect degradation of
Momar Toure et al.
Angewandte Chemie (International ed. in English), 55(6), 1966-1973 (2016-01-13)
The current inhibitor-based approach to therapeutics has inherent limitations owing to its occupancy-based model: 1) there is a need to maintain high systemic exposure to ensure sufficient in vivo inhibition, 2) high in vivo concentrations bring potential for off-target side effects, and 3) there is
Kedra Cyrus et al.
Molecular bioSystems, 7(2), 359-364 (2010-10-06)
Conventional genetic approaches have provided a powerful tool in the study of proteins. However, these techniques often preclude selective manipulation of temporal and spatial protein functions, which is crucial for the investigation of dynamic cellular processes. To overcome these limitations
Philipp M Cromm et al.
Cell chemical biology, 24(9), 1181-1190 (2017-06-27)
Traditional pharmaceutical drug discovery is almost exclusively focused on directly controlling protein activity to cure diseases. Modulators of protein activity, especially inhibitors, are developed and applied at high concentration to achieve maximal effects. Thereby, reduced bioavailability and off-target effects can


Protein Degrader Building Blocks are a collection of crosslinker-E3 ligand conjugates with a pendant functional group for covalent linkage to a target ligand.

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