Development and <i>In Vivo</i> Evaluation of Small-Molecule Ligands for Positron Emission Tomography of Immune Checkpoint Modulation Targeting Programmed Cell Death 1 Ligand 1
substantial portion of patients do not benefit from programmedcelldeath protein 1/programmed celldeath1ligand1 (PD-1/PD-L1) checkpoint inhibition therapies, necessitating a deeper understanding of predictive biomarkers. Immunohistochemistry (IHC) has played a pivotal role in assessing PD-L1 expression, but small-moleculepositronemissiontomography (PET) tracers could offer a promising avenue to
Parallel Solution-Phase Synthesis and General Biological Activity of a Uridine Antibiotic Analog Library
作者:Omar Moukha-chafiq、Robert C. Reynolds
DOI:10.1021/co4001452
日期:2014.5.12
coupling of the amino terminus of d-phenylalanine methylester to the free 5′-carboxylic acid moiety of 33 followed by sodium hydroxide treatment led to carboxylic acid analog 77. Hydrolysis of this material gave analog 78. The intermediate 77 served as the precursor for the preparation of novel dipeptidyl uridine analogs 79–99 through peptide coupling reactions to diverse amine reactants. None of the described
Domino 1,3-Dipolar Cycloadditions of N-Alkyl-α-Amino Esters with Paraformaldehyde: A Direct Access to α-Hydroxymethyl α-Amino Acids
作者:Carmen Nájera、José Sansano、Luis Castelló
DOI:10.1055/s-0033-1340816
日期:——
Abstract N-Alkyl-α-amino esters undergo a domino reaction, based on the iminium cation generation, with paraformaldehyde, followed by a 1,3-dipolar cycloaddition of the stabilized azomethine ylide with another equivalent of formaldehyde. The resulting products are oxazolidines, which can be transformed after hydrolysis into α-hydroxymethyl α-aminoacid or its derivatives. The diastereoselective 1