Chemoselective Bromination of Active Methylene and Methyne Compounds by Potassium Bromide, Hydrochloric Acid and Hydrogen Peroxide
作者:Masayuki Kirihara、Yoshiro Hirai、Shiho Ogawa、Takuya Noguchi、Kumiko Okubo、Yoshinari Monma、Ikuko Shimizu、Ryuji Shimosaki、Akihiko Hatano
DOI:10.1055/s-2006-948207
日期:2006.9
Abstract: Active methylene and methyne compounds can bechemoselectively brominated in high yields using potassiumbromide, hydrochloric acid, and hydrogen peroxide at room temper-ature. Key words: halogenation, halaides, green chemistry, bromination,active methylene compounds Halogenated active methylene and methyne compoundsare very important synthetic intermediates for the nucleo-philic substitutions
摘要:在室温下,使用溴化钾、盐酸和过氧化氢可以对活性亚甲基和次甲基化合物进行高产率的化学选择性溴化。关键词:卤化,卤化物,绿色化学,溴化,活性亚甲基化合物卤化活性亚甲基和亚甲基化合物是合成有机化学中亲核取代的非常重要的合成中间体。活性亚甲基化合物1卤化的经典方法是与溴1或硫酰氯反应2,但它们存在试剂毒性、反应后产生酸性气体或1中芳香环过度卤化等缺点。虽然之前已经开发了许多这种转换的新方法,它们中的大多数都有严重的缺点,例如会产生不需要的废物。3-5 Khan 及其同事最近通过使用五氧化二钒催化(V