Catalytic Amide Activation with Thermally Stable Molybdenum(VI) Dioxide Complexes
作者:Garrett E. Evenson、Wyatt C. Powell、Aaron B. Hinds、Maciej A. Walczak
DOI:10.1021/acs.joc.3c00218
日期:2023.5.5
practical method of oxazoline and thiazoline formation, which can facilitate the synthesis of natural products, chiral ligands, and pharmaceutical intermediates. This method capitalized on a Mo(VI) dioxide catalyst stabilized by substituted picolinic acid ligands, which is tolerant to many functional groups that would otherwise be sensitive to highly electrophilic alternative reagents.
pseudoprolines. To minimize the loss of the Fmoc protection, we optimized the saponification conditions and included a calcium additive that protected the other base-sensitive functionalities and improved the yield of the free acid (36–82%). The reaction requires a combination of CaCl2 and NaOH in a mixture of iPrOH and water at room temperature.
A simple route towards peptide analogues containing substituted (S)- or (R)-tryptophans
作者:Luca Gentilucci、Lucia Cerisoli、Rossella De Marco、Alessandra Tolomelli
DOI:10.1016/j.tetlet.2010.03.017
日期:2010.5
the efficacy of this method for preparing biologically relevant compounds, we synthesized two unprecedented analogues of endomorphin-1, the endogenous agonist of the μ-opioid receptor, having either (S)- or (R)-2-methyltryptophan in position 3.