The Reaction of Primary Nitro Compounds with Dipolarophiles in the Presence of<i>p</i>-Toluenesulfonic Acid
作者:Tomio Shimizu、Yoshiyuki Hayashi、Kazuhiro Teramura
DOI:10.1246/bcsj.57.2531
日期:1984.9
were obtained from the reaction of primary nitro compounds [methyl nitroacetate, 2-nitro-1-phenylethanone, (nitromethyl)benzene, 1-nitropropane, and (phenylsulfonyl)nitromethane] with dipolarophiles in refluxing mesitylene in the presence of a small amount of p-toluenesulfonic acid. The formation of these products can be explained in terms of 1,3-dipolar cycloaddition of nitrile oxide generated by a
3-取代的 2-异恶唑啉或异恶唑是从初级硝基化合物 [硝基乙酸甲酯、2-硝基-1-苯基乙酮、(硝基甲基)苯、1-硝基丙烷和(苯磺酰基)硝基甲烷]与偶极体在回流的均三甲苯中反应获得的存在少量对甲苯磺酸。这些产物的形成可以通过初级硝基化合物脱水产生的腈氧化物的 1,3-偶极环加成来解释。另一方面,4,5-十亚甲基-3-苯基磺酰基-2-异恶唑啉N-氧化物是从(苯基磺酰基)硝基甲烷与环十二烯的类似反应中获得的。异恶唑啉N-氧化物的形成可以基于3,4-双(苯基磺酰基)呋喃2-氧化物的中间体来解释。