A novel reaction of 1,4-dipolar intermediate 3,generated from pyridine and dimethyl acetylenedicarboxylate, witharomatic aldehydes, resulted in the facile synthesis of 2-benzoylfumaratesvia the elimination of pyridine, whereas with N-tosyliminesas dipolarophiles the reaction afforded highly substituted 1-azadienes.The reaction of pyridine and dimethyl acetylenedicarboxylate withN-substituted isatins, resulted in a novel three component condensation,affording spiropyrido[2,1-b][1,3]oxazinoderivatives in high yields via 1,4-dipolar cycloaddition.
由
吡啶和
乙炔二
甲酸二甲酯生成的 1,4-偶极中间体 3 与芳香醛的新反应,通过消除
吡啶,轻松合成 2-苯甲酰
富马酸酯,而与 N-
甲苯磺
酰亚胺作为亲偶极物,反应得到高度取代的 1-氮杂二烯.
吡啶和
乙炔二
甲酸二甲酯与N-取代
靛红的反应,产生一种新型的三组分缩合,通过1,4-偶极环加成以高产率提供螺
吡啶并[2,1-b][1,3]恶嗪衍
生物。