Selenium-promoted electrophilic cyclization of arylpropiolamides: synthesis of 3-organoselenyl spiro[4,5]trienones
作者:Ana Maria S. Recchi、Pedro H. P. Rosa、Davi F. Back、Gilson Zeni
DOI:10.1039/d0ob00609b
日期:——
3-organoselenyl-quinolinone derivative formation via 6-endo-dig was avoided using an electrophilic organoselenium species in a metal-free protocol. The use of phenylselenyl bromide (1.3 equiv.), as the electrophilic source, in nitromethane (3 mL) at 90 °C enabled the cyclization of N-(2-methoxyphenyl)-N-methyl-3-phenylpropiolamides, giving 3-organoselenyl[4,5]triene-2,6-dione derivatives. The extension of the
本文介绍了硒促进芳基丙酰胺的亲电环化反应,该反应可通过5-endo-dig ipso-mode合成3-organoselenyl spiro [4,5] trienones。在无金属方案中,使用亲电子有机硒物种可避免通过6-endo-dig形成3-organoselenyl-quinolinone衍生物。在90°C的硝基甲烷(3 mL)中,使用苯基硒烯基溴化物(1.3当量)作为亲电子源,可以使N-(2-甲氧基苯基)-N-甲基-3-苯基丙酰胺化物环化,得到3-有机硒基[4,5]三烯-2,6-二酮衍生物。将标准条件扩展至N-(4-甲氧基苯基)-苯基丙酰胺,导致相应的3-有机硒基螺[4,5]三烯酮在8位具有羰基。除了,