Switching the Stereochemical Outcome of 6-<i>Endo</i>-<i>Trig</i> Cyclizations; Synthesis of 2,6-<i>Cis</i>-6-Substituted 4-Oxopipecolic Acids
作者:Mark Daly、Alastair A. Cant、Lindsay S. Fowler、Graham L. Simpson、Hans Martin Senn、Andrew Sutherland
DOI:10.1021/jo3022583
日期:2012.11.16
A base-mediated 6-endo-trig cyclization of readily accessible enone-derived α-aminoacids has been developed for the direct synthesis of novel 2,6-cis-6-substituted-4-oxo-l-pipecolic acids. A range of aliphatic and aryl side chains were tolerated by this mild procedure to give the target compounds in good overall yields. Molecular modeling of the 6-endo-trig cyclization allowed some insight as to how
Synthesis and Fluorescent Properties of β-Pyridyl α-Amino Acids
作者:Alexander H. Harkiss、Jonathan D. Bell、Astrid Knuhtsen、Andrew G. Jamieson、Andrew Sutherland
DOI:10.1021/acs.joc.9b00036
日期:2019.3.1
class of β-pyridyl α-amino acid is described using a highly regioselective, ytterbium-catalyzed hetero-Diels–Alder reaction of enones with vinyl ethers followed by a modified Knoevenagel–Stobbe reaction as the key heterocycle forming steps. Investigation of the properties and applications of these amino acids showed that they could be utilized in solid phase peptide synthesis for the preparation of a