832096-87-4Relevant articles and documents
Preparation of axially chiral quinolinium salts related to NAD+ models: New investigations of these biomimetic models as 'chiral amide-transferring agents'
Leleu, Stephane,Papamicael, Cyril,Marsais, Francis,Dupas, Georges,Levacher, Vincent
, p. 3919 - 3928 (2004)
The general purpose of this work is to investigate the potential of biomimetic NAD+ models as 'nucleophile-transferring agents' with the ultimate motivation to develop new synthetic tools. This first report focuses on the preparation of an axially chiral quinolinium salt 8. A preliminary investigation of these NAD+ analogues as 'chiral amide-transferring agents' is reported herein. The synthesis of the desired quinolinium salt 8 was first attempted via a Friedlaender approach. Given the poor reproducibility of this first synthetic route, a second strategy making use of an intramolecular nickel-catalyzed coupling was developed with success, furnishing the quinolinium salt 8 in 12% overall yield. The potential of the quinolinium salt 8 as a 'chiral amide-transferring agent' was then investigated. Regioselective 1,4-addition of benzylamine and piperidine produced, respectively, adducts 18a and 18b with high diastereoselectivity (de >95%). The resulting 'chiral masked-amide' 18b was reacted with various activated aryl esters affording the corresponding atropisomeric amide 20 with modest atropenantioselectivity (ee = 2-20%).
