The process of reacting a PY-carboxamidine with .alpha.-chloroacrylonitrile in the presence of an acid-acceptor to produce 2-PY-4-pyrimidinamines where PY is 4- or 3- or 2-pyridinyl or 4- or 3- or 2-pyridinyl having one or two lower-alkyl substituents. The products produced by the process are useful as anti-allergic agents per se and, also, are useful as intermediates in the preparation of other anti-allergic agents, namely, dialkyl N-(2-PY-4-pyrimidinyl)-aminomethylenemalonates and analogs, as well as N-(2-PY-4-pyrimidinyl)ureas.
在存在酸接受体的情况下,将PY-
羧酸甲酰胺与α-
氯丙烯腈反应,生成2-PY-4-
嘧啶胺,其中PY是4-或3-或2-
吡啶基或4-或3-或2-
吡啶基,具有一个或两个较低的烷基取代基。该过程产生的产物本身可用作抗过敏剂,同时也可用作其他抗过敏剂的中间体,即二烷基N-(2-PY-4-
嘧啶基)-
氨基
甲叉丙酸酯和类似物,以及N-(2-PY-4-
嘧啶基)
脲。