A highly efficient aza-Diels-Alder reaction of trans-1-methoxy-2-methyl-3-trimethylsiloxybuta-1,3-diene with N-benzhydryl imines was catalyzed by Yb(OTf)3 in toluene at room temperature to give corresponding 2,5-disubstituted 2,3-dihydro-4-pyridones in high yields. Three-component reactions of diene with aldehydes and amines were also performed smoothly to afford the desired cycloadducts under solvent-free condition in 51-86% yields.
在室温下,Yb(OTf)3 在
甲苯中催化了反式-1-甲氧基-2-甲基-3-三甲基
硅氧基丁-1,3-二烯与 N-二苯基
亚胺的高效杂氮-Diels-Alder 反应,得到了相应的 2,5-二取代 2,3-二氢-4-
吡啶酮,收率很高。二烯与醛和胺的三组分反应也在无溶剂条件下顺利进行,以 51-86% 的收率得到了所需的环加载产物。