Design, Synthesis, and Application of Enantioselective Coupling Reagent with a Traceless Chiral Auxiliary
摘要:
Stable chiral N-triazinylbrucinium tetrafluoroborate enantioselectively activates racemic carboxylic acids yielding enantiomerically enriched amides, esters, and dipeptides with er from 8:92 to 0.5:99.5. Due to the departure of a chiral auxiliary after the activation of the carboxylic function, all of the subsequent stages of the coupling reaction proceed without any perturbation caused by a chirality discriminator (traceless). Therefore, the advantageous coupling conditions, configuration, and enantiomeric purity of the final product are entirely predictable from the model experiment.
作者:Wanjin Zhong、Chuan Wan、Ziyuan Zhou、Chuan Dai、Yichi Zhang、Fei Lu、Feng Yin、Zigang Li
DOI:10.1021/acs.orglett.3c03539
日期:2023.12.8
Through systematic optimization of halopyridinium compounds, we established a peptide coupling protocol utilizing 4-iodine N-methylpyridinium (4IMP) for solid-phase peptidesynthesis (SPPS). The 4IMP coupling reagent is easily prepared, bench stable, and cost-effective. Employing 4IMP in the SPPS process has showcased remarkable chemoselectivity and efficiency, effectively eliminating racemization