Enantioselective Synthesis of Spiro[indolizidine-1,3′-oxindoles]
作者:Maria Pérez、Carlos Ramos、Lucia Massi、Silvia Gazzola、Chiara Taglienti、Nihan Yayik、Elies Molins、Antonio Viayna、F. Javier Luque、Joan Bosch、Mercedes Amat
DOI:10.1021/acs.orglett.7b01818
日期:2017.8.4
A three-step procedure for the enantioselective synthesis of spiro[indolizidine-1,3′-oxindoles], consisting of a stereoselective cyclocondensation reaction between (S)-tryptophanol and a prochiral or racemic δ-oxoester, bromination of the resulting oxazolopiperidone lactam, and a final stereoselective spirocyclization, is reported.
molecules containing the aminoalcohol functionality. In this communication, we report the development of a small library of indolo[2,3-a]quinolizidines and evaluation of their activity as N-Methyl d-Aspartate (NMDA) receptor antagonists. The indolo[2,3-a]quinolizidine scaffold was obtained using the following key steps: (i) a stereoselective cyclocondensation of (S)- or (R)-tryptophanol with appropriate
Enantioselective Spirocyclizations from Tryptophanol-Derived Oxazolopiperidone Lactams
作者:Mercedes Amat、Maria M. M. Santos、Antonia M. Gómez、Danica Jokic、Elies Molins、Joan Bosch
DOI:10.1021/ol0712327
日期:2007.7.1
A straightforward synthetic route to enantiopure spiro[indole-3,3'-indolizidines] is reported. The key step is a Lewis acid promoted cyclization of a N-a-tosyltryptophanol-derived oxazolopiperidone lactam in the presence of Et3SiH.
Tryptophanol-derived oxazolopiperidone lactams: Identification of a hit compound as NMDA receptor antagonist
N-Methyl-D-aspartate receptors (NMDAR) exacerbated activation leads to neuron death through a phenomenon called excitotoxicity. These receptors are implicated in several neurological diseases (e.g., Alzheimer and Parkinson) and thus represent an important therapeutic target. We herein describe the study of enantiopure tryptophanol-derived oxazolopiperidone lactams as NMDA receptor antagonists. The most active hit exhibited an IC50 of 63.4 mu M in cultured rat cerebellar granule neurons thus being 1.5 fold more active than clinically approved NMDA antagonist amantadine (IC50 = 92 mu M). (C) 2014 Elsevier Ltd. All rights reserved.
Enantioselective formal synthesis of ent-rhynchophylline and ent-isorhynchophylline
作者:Mercedes Amat、Carlos Ramos、Maria Pérez、Elies Molins、Pedro Florindo、Maria M. M. Santos、Joan Bosch
DOI:10.1039/c2cc38540f
日期:——
Starting from (S)-tryptophanol, a formal synthesis of ent-rhynchophylline and ent-isorhynchophylline, involving stereoselective cyclocondensation, spirocyclization, and alkylation reactions, and the final adjustment of the oxidation level at the oxindole and piperidine moieties, is reported.