Microwave assisted straightforward synthetic method for benzimidazole linked quinoxalinones on soluble polymer support
作者:Cheng-Ting Chou、Gorakh S. Yellol、Wong-Jin Chang、Mei-Lian Sun、Chung-Ming Sun
DOI:10.1016/j.tet.2011.01.040
日期:2011.3
implemented linear synthesis. In key cyclization step, the regioselective N-acylation at secondary amine with chloroacetyl chloride followed by spontaneous intramolecular ring closure through ortho-amine functionality generate the quinoxaline skeleton under microwave irradiation. The removal of polymer support and exposure of quinoxalines for auto-oxidation finally produce the benzimidazole linked quinoxalinone
开发了一种简单有效的方法,用于在微波条件下在可溶性聚合物载体上合成苯并咪唑连接的喹喔啉酮。酸催化4-氟-3-硝基苯甲酸与聚合物固定的邻苯二胺,ipso的缩合反应用各种伯胺进行氟亲核取代和用乙酰氯环化是实施线性合成的关键步骤。在关键的环化步骤中,在仲胺处用氯乙酰氯进行的区域选择性N-酰化,然后通过邻胺官能团自发地分子内闭环,在微波辐射下生成了喹喔啉骨架。除去聚合物载体和暴露于喹喔啉以进行自氧化,最终产生具有高纯度和高收率的苯并咪唑连接的喹喔啉酮衍生物。