Stereoselective synthesis and preliminary evaluation of new d-3-heteroarylcarbonylalanines as ligands of the NMDA receptor
摘要:
New N-heteroarylcarbonylalanines of the D-series were stereoselectively prepared from enoates derived from D-mannitol. These compounds were active in binding and functional assays of the NMDA sub-type of glutamate receptors. A pyridine derivative inhibited MK801 binding, protected neurons from excitotoxic damage and blocked NMDA-induced currents in neurons. A thiophene derivative positively modulated the NMDA receptor, possibly through the allosteric glycine site. (C) 2004 Elsevier Ltd. All rights reserved.
Synthesis of β-amino arylketones through the addition of ArLi derivatives to β-aminoesters
摘要:
2-Lithiumthiophene and 2-lithiumpyridine were allowed to react with iv-substituted beta -aminoesters. Only beta -amino arylketones were obtained from N-BOC, IV-H derivatives, while arylenoates were formed (retro-conjugate addition) from those substrates bearing N-Bn, N-H substituents, despite the aryllithium used. When the nitrogen is disubstituted (BOC and Bn), the product distribution depended on the nucleophile, leading to tertiary alcohols for 2-lithiumthiophene or ketones for 2-lithiumpyridine. Tertiary alcohols were also formed when PhLi was used as a nucleophile. (C) 2001 Elsevier Science Ltd. All rights reserved.