Asymmetric Synthesis of δ-Substituted α,β-Unsaturated δ-Lactams by Ring Closing Metathesis of Enantiomerically Pure <i>N</i>-Acryloyl-homoallylic Amines
作者:Claudio Fiorelli、Diego Savoia
DOI:10.1021/jo0703000
日期:2007.8.1
Optically pure secondary homoallylic amines, obtained by highly diastereoselective addition of allylmetal reagents to imines derived from chiral amines, were N-dealkylated, and the primary amines were converted to N-acryloyl amides. Then, ring closing metathesis gave delta-substituted delta-lactams in good overall yields.
Stereospecific Intramolecular Arylation of 2- and 3-Pyridyl Substituted Alkylamines via Configurationally Stable α-Pyridyl Organolithiums
作者:Julien Maury、Wojciech Zawodny、Jonathan Clayden
DOI:10.1021/acs.orglett.6b03603
日期:2017.2.3
Treatment of N′-aryl urea derivatives of enantiomerically enriched α-(2-pyridyl) and α-(3-pyridyl)alkylamines with a base leads to the migration of the N′-aryl substituent from N to C in a ‘nonclassical’ intramolecular nucleophilic aromatic substitution reaction. Both electron-rich and -poor rings migrate successfully. A new quaternary stereogenic center is formed adjacent to the pyridine ring with
Addition of allylmetal reagents to the imine derived from 2-pyridine carboxaldehyde and methyl (S)-valinate. Synthesis of (S)- and (R)-1-(2-pyridyl)-3-butenamine
作者:Giuseppe Alvaro、Diego Savoia
DOI:10.1016/0957-4166(96)00251-0
日期:1996.7
Allylmetal reagents add to the iminederivedfrom 2-pyridine carboxaldehyde and methyl (S)-valinate or to preformed imine-metal salt complexes to give mainly the S,S- or the R,S-secondary homoallylic amine, depending on the nature of the allylmetal reagent. Both the (S)- and (R)-1-(2-pyridyl)-3-butenamine were prepared with high enantiomeric purity by removal of the auxiliary group.