Synthesis of Methoxy-2-quinolones via Pummerer-type Cyclization of N-Aryl-N-methyl-3-(phenylsulfinyl)propionamides.
作者:Jun TODA、Michiya SAKAGAMI、Yoko GOAN、Mina SIMAKATA、Toshiaki SAITOH、Yoshie HORIGUCHI、Takehiro SANO
DOI:10.1248/cpb.48.1854
日期:——
The thionium ions 10 generated by Pummerer reaction of N-aryl-N-methyl-3-(phenylsulfinyl)propionamides 4 caused not only an electrophilic cyclization reaction producing 2-quinolones 8, but also the formation of the vinyl sulfides 5 and 6 in favor of the latter reaction. On the other hand, the treatment of the vinyl sulfides 5 and 6 with p-toluenesulfonic acid induced cyclization to afford the 2-quinolones
由N-芳基-N-甲基-3-(苯基亚磺酰基)丙酰胺Pummerer反应产生的硫鎓离子10不仅引起产生2-喹诺酮8的亲电环化反应,而且有利地形成了乙烯基硫化物5和6。后一种反应。另一方面,取决于芳环的电子性质,用对甲苯磺酸对乙烯基硫化物5和6的处理引起环化,从而以优异至中等的收率得到2-喹诺酮8,从而提供了一种方便的方法用于合成甲氧基-2-喹诺酮。