4-Quinolone fused heterocyclic ring systems by intramolecular reactions of 4-quinolone-2-carboxamides
作者:Raffaella Cincinelli、Loana Musso、Giangiacomo Beretta、Sabrina Dallavalle
DOI:10.1016/j.tet.2014.11.018
日期:2014.12
A versatile synthetic route to new 4-quinolone-based polycyclic systems is described. TFA-catalyzed intramolecular reaction of N-unsubstituted quinolone-2-carboxylic acid amides gives structurally diverse compounds, depending on the length of the chain. Acid treatment of β-oxoamides furnishes 3H-pyrazino[1,2-a]quinoline-4,6-diones, due to the nucleophilic attack of N-1 to the carbonyl group, whereas
描述了一种新的基于4-喹诺酮的多环体系的通用合成途径。TFA催化的N-未取代的喹诺酮-2-羧酸酰胺的分子内反应根据链的长度提供结构上不同的化合物。由于N-1对羰基的亲核攻击,β-草酰胺的酸处理可提供3H-吡嗪并[1,2-a]喹啉-4,6-二酮,而TFA处理δ-和ε-草酰胺可导致3H-吡嗪并[1,2-a]喹啉-4,6-二酮。通过串联异环化反应形成四环化合物。