Incorporation of <i>cis</i>- and <i>trans</i>-4,5-Difluoromethanoprolines into Polypeptides
作者:Vladimir S. Kubyshkin、Pavel K. Mykhailiuk、Sergii Afonin、Anne S. Ulrich、Igor V. Komarov
DOI:10.1021/ol302412a
日期:2012.10.19
trans-adduct as the sole product with 71% yield. Upon cleavage of the N-protection group the free amino acid decomposed rapidly. Its incorporation into the proline-rich cell-penetrating “sweet arrow peptide” was thus accomplished using a dipeptide strategy. Two building blocks, containing either cis- or trans-4,5-difluoromethanoproline, were obtained by difluorocyclopropanation of the aminoacyl derivatives