automated and manual synthesis, superior to those of HOBt and at least comparable to those of HOAt, and surpassing the latter coupling agent in the more demanding peptide models. Stability assays showed that there was no risk of capping the resin under standard coupling conditions. Finally, calorimetry assays (DSC and ARC) showed decomposition profiles for benzotriazole‐based additives that were consistent
Ethyl 2-Cyano-2-(hydroxyimino)acetate (Oxyma): An Efficient and Convenient Additive Used with Tetramethylfluoroformamidinium Hexafluorophosphate (TFFH) to Replace 1-Hydroxybenzotriazole (HOBt) and 1-Hydroxy-7-azabenzotriazole (HOAt) during Peptide Synthesis
作者:Sherine N. Khattab
DOI:10.1246/bcsj.20100075
日期:2010.11.15
The appropriateness of ethyl 2-cyano-2-(hydroxyimino)acetate (Oxyma) as a substitute for benzotriazole-basedadditives, for use in the TFFH approach for peptidesynthesis, is discussed in terms of ...
family of uronium‐type couplingreagents that differ in their iminium moieties and leaving groups. The presence of the morpholino group in conjunction with an oxime derivative—especially ethyl 2‐cyano‐2‐(hydroxyimino)acetate (Oxyma)—had a marked influence on the solubilities, stabilities, and reactivities of the reagents. Finally, the new uronium salt derived from Oxyma (COMU) performed extremely well
Oxyma-T, expanding the arsenal of coupling reagents
作者:Yahya E. Jad、Beatriz G. de la Torre、Thavendran Govender、Hendrik G. Kruger、Ayman El-Faham、Fernando Albericio
DOI:10.1016/j.tetlet.2016.06.109
日期:2016.8
structure to HONM and Oxyma-B for use in peptide synthesis. Oxyma-T produces less racemization than HOBt, HOAt, OxymaPure, and Oxyma-B during the stepwise solution-phase synthesis of Z-Phg-Pro-NH2. Moreover, it exhibits superior coupling efficiency in comparison to HOBt during the SPPS of an Aib-enkephalin pentapeptide. Racemization during segmentcoupling follows the order: HOBt > Oxyma-T > Oxyma
作者:Fernando Albericio、Miguel A Bailén、Rafael Chinchilla、David J Dodsworth、Carmen Nájera
DOI:10.1016/s0040-4020(01)00985-1
日期:2001.11
3-tetramethylurea (TMU) or 1,3-dimethylpropyleneurea (DMPU), have been employed as reagents in solution and solid-phase peptidecoupling chemistry. Furthermore, 2-mercaptopyridine-1-oxide has been employed as racemization-reducing additive combined with the new thiouronium salts and other frequently used peptidecouplingreagents such as DCC or TBTU.