A series of dipeptide nitriles with a thienyl alanine in P2 were identified as potent and selective cathepsinCinhibitors. Incorporation of a substituted cyclopropyl moiety in P1 effectively protects these derivatives against hydrolase activity in whole blood.
Peptide ligation by chemoselective aminonitrile coupling in water
作者:Pierre Canavelli、Saidul Islam、Matthew W. Powner
DOI:10.1038/s41586-019-1371-4
日期:2019.7
N-to-C peptide ligation. Our model unites prebiotic aminonitrile synthesis and biological α-peptides, suggesting that short N-acyl peptide nitriles were plausible substrates during early evolution.Prebiotic peptide formation is achieved through chemoselective, high-yielding ligation of α-aminonitriles in water, showing selectivity for α-peptide coupling and tolerance of all proteinogenic amino acid residues
Disclosed are compounds of Formula (I) or stereoisomers, salts, or prodrugs thereof, wherein: Q is, or R
1
is phenyl substituted with zero to 3 substituents; and R
1
, R
2
, R
3
, R
4
, R
5
, and G are defined herein. Also disclosed are methods of using such compounds as selective agonists for G protein-coupled receptor S1P1, and pharmaceutical compositions comprising such compounds. These compounds are useful in treating, preventing, or slowing the progression of diseases or disorders in a variety of therapeutic areas, such as autoimmune diseases and vascular disease.
Disclosed are compounds of Formula (I) or stereoisomers, salts, or prodrugs thereof, wherein: Q is, or R1 is phenyl substituted with zero to 3 substituents; and R1, R2, R3, R4, R5, and G are defined herein. Also disclosed are methods of using such compounds as selective agonists for G protein-coupled receptor S1P1, and pharmaceutical compositions comprising such compounds. These compounds are useful in treating, preventing, or slowing the progression of diseases or disorders in a variety of therapeutic areas, such as autoimmune diseases and vascular disease.
Prebiotic synthesis of 2-deoxy-<scp>d</scp>-ribose from interstellar building blocks promoted by amino esters or amino nitriles
作者:Andrew M. Steer、Nicolas Bia、David K. Smith、Paul A. Clarke
DOI:10.1039/c7cc06083a
日期:——
to debate. Here we demonstrate that 20 mol% of proteinogenic amino esters promote the selective formation of 2-deoxy-D-ribose over 2-deoxy-D-threopentose in combined yields of ≥4%. We also demonstrate the first aldol reaction promoted by prebiotically-relevant proteinogenic amino nitriles (20 mol%) for the enantioselective synthesis of D-glyceraldehyde with 6% ee, and its subsequent conversion into