PyOxim® is a novel and highly efficient coupling reagent that mediates coupling reactions with efficiencies superior to HATU and PyBOP® and comparable to COMU®.
Synonym:1-Cyano-2-ethoxy-2-oxoethylideneaminooxy-tris-pyrrolidino-phosphonium hexafluorophosphate; O-[(1-cyano-2-ethoxy-2-oxoethylidene)amino]-oxytri(pyrrolidin-1-yl) phosphonium hexafluorophosphate
White crystalline powder
Store in a cool and dry place (2-8oC)
- It has excellent solubility in DMF and is stable in solution under an inert atmosphere for two days.
- PyOxim® shows higher stability in acetone and DMF than all benzotriazole counterparts, consequently standing out as promising choice for cyclization.
- Furthermore, PyOxim® is safer to handle and less allergenic than HOBt-based coupling reagents, and it is not explosive under normal operating conditions.
- PyOxP and PyOxB: the Oxyma-based novel family of phosphonium salts
Ramon Subir´os-Funosas, Ayman El-Faham and Fernando Albericio Org. Biomol. Chem., 2010, 8, 3665–3673.
- Fast conventional Fmoc solid-phase peptide synthesis: a comparative study of different activators
Christina Ann Chantell, Michael Abayomi Onaiyekan and Mahendra Menakuru J. Pept. Sci. 2012; 18: 88–91.
Kilogram-Scale GMP Manufacture of Tirzepatide Using a Hybrid SPPS/LPPS Approach with Continuous ManufacturingMichael O. Frederick, Raymond A. Boyse, Timothy M. Braden, Joel R. Calvin, Bradley M. Campbell, Shujauddin M. Changi, Stephanie R. Coffin, Carmel Condon, Olivia Gowran, Jennifer McClary Groh, Stephen R. Groskreutz, Zachary D. Harms, Ashley A. Humenik, Neil J. Kallman, Nicholas D. Klitzing, Michael E. Kopach, Juliana K. Kretsinger, Gordon R. Lambertus, Jeffrey T. Lampert, Laura M. Maguire, Humphrey A. Moynihan, Nessa S. Mullane, John D. Murphy, Marie E. O’Mahony, Rachel N. Richey, Kevin D. Seibert, Richard D. Spencer, Mark A. Strege, Nil Tandogan, Frank L. Torres Torres, Sergey V. Tsukanov, and Han XiaOrganic Process Research & Development 2021 25 (7), 1628-1636
Reactivity and Racemization
Solid-Phase Fragment Condensation of Z-Gly-Gly-Val-OH + H-Pro-Gly-Gly-NH-Resin (1) in 2eq. DIEA
|Coupling Reagent||DL (%)|
Solution Cyclization of H-Ala-Ala-MeAla-Ala-Ala-OH (1)
|Coupling Reagent||Cyclic(%)||Linear (%)||Linear Dimer (%)|
Manufacture of Tirzepatide (GIP/GLP-1 dual agonist). Fragment coupling. (3)
|Fragments coupling||reagent||solvent||Base||Coupling time/temp||Yield after purification %|
|AA 22-20 + AA 30-39||PyOxim||DMSO:ACN||DIEA||1h/200C||75-80|
|AA22-39 + AA 15-21||PyOxim||DMSO: ACN||DIEA||3h/200C||68-75|
|AA 15-39+ AA1-14||HATU||DMF:ACN||DIEA||3h/00C||95-100|
Pyoxim is a much greener coupling reagent that PyBOP, hazardous and mutagenic HOBt is not used in production. It is also safer for the user than uronium(guanidinium) coupling reagents because it does not produce toxic urea waste and is not a sensitizer.
PyOxim solid is stable at 540C for at least two weeks. Stable for at least 24 months if stored at RT and keep away from light.
Shows superior to PyBOP stability in a solvent.
|0.25 M solutions of coupling reagents in DMF||0 days||1 day||2 days
|PyAOP||260mg/0.25ml (1.99M)||230mg/0.25ml (1.79M)|
|PyBOP||200mg/0.25ml (1.54M)||160mg/0.25ml (1.23M)|
|PyClock||200mg/0.25ml (1.44M)||100mg/0.25ml (0.72M)|
|PyOxim||340mg/0.25ml (2.58M)||260mg/0.25ml (1.97M)|
Flamability and Expolsivity hazard
According to test results, PyOxim should not be regulated as a Class 1 explosive and Class 4.1 flammable.
We are offering several packing options that can be tailored to the customer’s needs.
-Various-sized HDPE stacking containers with Black antistatic PE liner.
-DoverPac® provides a high level of powder containment during loading and offloading operation.