AK 2 S 2 O 8促进了伯醇与2-氨基苯甲酰胺的氧化串联环化以合成喹唑啉酮,在没有过渡金属和碱的不分电解条件下成功实现。该协议的主要特点是利用 K 2 S 2 O 8作为一种廉价且易于处理的自由基替代物,可以通过简单的程序有效地促进反应,从而通过形成氮杂环在恒定电流下以一锅法在室温下直接氧化环化。由于使用了连续流动的电化学装置,这种绿色、温和、实用的电合成具有高效率和优异的官能团耐受性,并且易于放大。
A novel seven‐step methodology for the synthesis of N‐substituted‐6‐alkoxypteridin‐4‐amine has been developed with the total yields of 35.4–41%. Twenty new compounds were synthesized by heterocyclization of easily prepared 3‐amino‐6‐bromopyrazine‐2‐carboxamide, subsequent alkoxylation, chlorination, and nucleophilic substitution. Their structures were confirmed by 1H‐NMR, 13C‐NMR, ESI‐MS, and elemental analysis. The structure of N‐(3‐chloro‐4‐fluorophenyl)‐6‐ethoxypteridin‐4‐amine was further determined by X‐ray crystallographic analysis. It was found that different chlorinating reagents gave different products. The possible chlorination mechanism was discussed.