react with alkynoic acids (AAs) to achieve gold‐catalyzed highly selective cascade reactions to furnish novel indole‐fused skeletons. Furthermore, with this powerful gold catalytic system, a library of indole/pyrrole/thiophene/benzene/naphthalene/pyridine‐based nitrogen‐containing heterocyclic compounds (NCHCs) with scaffold diversity and molecular complexity was constructed rapidly using various amine
scope. In addition, this is the first example of the generation of an indole/thiophene/pyrrole/pyridine/naphthalene/benzene-fused N-heterocycle library through gold catalysis in water from readily available materials. Notably, the discovery of antibacterial molecules from this library demonstrates its high quality and potential for the identification of active pharmaceutical ingredients.
Convenient syntheses of dihydropyrrolo[2′,1′:3,4]pyrazino- and dihydropyrrolo[2′,1′:3,4][1,4]diazepino-[2,1-a]isoindolones
作者:Alan R. Katritzky、Hai-Ying He、Rong Jiang
DOI:10.1016/s0040-4039(02)00350-7
日期:2002.4
Dihydropyrrolo[2'.1':3,4]pyrazino[2.1-a]isoindolones 10a-10c were obtained in 76-81% yields by the reaction of 2-(1H-pyrrol-l-yl)ethylamine 8 with 2-formylbenzoic acids 9a, 9b or 22-acetylbenzoic acid 9c via N-acyliminium cation aromatic cyclizations. Similarly, dihydropyrrolo[2',1':3,4][1,4]diazepino[2.1-a]isoindolones 12a, 12b were prepared in one-pot reactions front 3-(1H-pyrrol-l-yl)propylamine 11 and 2-formylbenzoic acids 9a, 9b. (C) 2002 Elsevier Science Ltd. All rights reserved.