Artículos de revistas
Enantioselective total synthesis of (S)-(+)-lennoxamine through asymmetric hydrogenation mediated by L-proline-tetrazole ruthenium catalyst
Registro en:
TETRAHEDRON LETTERS Volume: 53 Issue: 28 Pages: 3672-3675 DOI: 10.1016/j.tetlet.2012.05.033
0040-4039
Autor
Mirabal-Gallardo, Y.
Pierola, J.
Shankaraiah, N.
Santos, L.S.
Institución
Resumen
Santos, LS (reprint author), Univ Talca, Chem Inst Nat Resources, Lab Asymmetr Synth, POB 747, Talca, Chile A novel asymmetric synthetic strategy to prepare isoindolobenzazepine based lennoxamine alkaloid has been achieved in high ee% starting from 2-(benzo[d][1,3]dioxol-5-yl)ethanamine and 1-(chloromethyl)-2,3-dimethoxybenzene in 5 steps and with a 34% overall yield. The potentiality of this route involved the Bischler-Napieralsky cyclization that leads to tetracyclic indolinium skeleton, generation of chiral center through asymmetric hydrogen-transfer reaction employing L-proline-tetrazole as chiral ligand with Ru/Ir/Rh, and anodic oxidation as the key steps in the synthesis. (C) 2012 Elsevier Ltd. All rights reserved.