有机催化修饰的Guareschi-Thorpe型区域选择性合成:统一直接获得5,6,7,8-四氢喹啉和其他脂环式[ b ]吡啶
摘要:
前所未有的有机催化,区域选择性,改良的Guareschi-Thorpe型方案,通过鉴定壳聚糖作为多相催化剂,可模块化合成5,6,7,8-四氢喹啉22a – g和其他脂环式[ b ]稠合吡啶23 – 28。被报道。这种新颖的策略操作简单,并且具有广泛的官能团耐受性和底物相容性。拟议的机制途径涉及亚胺-烯胺级联方法,用于合成结构多样的脂环式[ b ]稠合吡啶杂环。新型抗真菌分子的克级合成和鉴定29 –图31强调了这种方法的实用性。
Replacement of the quinoline system in 2-phenyl-4-quinolinecarboxamide NK-3 receptor antagonists
摘要:
Results from a medicinal chemistry approach aimed at replacing the quinoline ring system in the potent and selective human neurokinin-3 (hNK-3) receptor antagonists 1-4 of general formula I are discussed. The data give further insight upon the potential NK-3 pharmacophore. In particular, it is highlighted that both the benzene-condensed ring and the quinoline nitrogen are crucial determinants for optimal binding affinity to the hNK-3 receptor. Some novel compounds maintained part of the binding affinity to the receptor (5, 6, 10 and 13) and compound 5, featuring the naphthalene ring system, appears to be suitable for further modifications; it offers the option to introduce electron-withdrawing groups at position 2 and 4, conferring on the ring an overall electron-deficiency similar to that of the quinoline. (C) 1999 Elsevier Science S.A. All rights reserved.