presence of molecular sieves. Among various triflates, Zn(OTf)2 has been found to be the best. The cleavage of the N-Ts bond of the cyclized products has been studied in order to make it more versatile in synthesis. The mechanistic aspect of the reaction has been studied by using chiral aziridines as substrates. These formal [3 + 2] cycloaddition reactions of aziridines with nitriles and carbonyls proceed
在多种
路易斯酸的存在下,已经研究了N-
甲苯磺酰基
氮丙啶与腈和羰基的反应生成
咪唑啉和
恶唑烷。用1当量的BF 3 ·Et 2 O或Et 3 OBF 4在CH 2 Cl 2中反应是有效的。然而,在无溶剂条件下,
金属
三氟甲磺酸酯具有催化作用,可为N-
甲苯磺酰
氮丙啶与腈环加成反应提供最佳结果。在
分子筛存在下,与羰基化合物的相同反应在CH 2 Cl 2中进行得最好。在各种
三氟甲磺酸酯中,Zn(OTf)2被发现是最好的。为了使其在合成中更具通用性,已经研究了环化产物的N -Ts键的裂解。已经通过使用手性
氮丙啶作为底物研究了反应的机理。
氮丙啶与腈和羰基的这些正式的[3 + 2]环加成反应以Ritter方式进行。