In connection with our research of pyrazolo[3,4-b]quinolines we were also interested in the preparation of various pyrazole intermediates. In some cases we found a method useful based on extrusion of elemental sulfur from intermediate 1,3,4-thiadiazines. This short contribution describes the preparation of some new 3-anilino-4-pyrazolecarboxylic acid derivatives using this method.
关于我们对
吡唑并[3,4-
b]
喹啉的研究,我们也对
吡唑中间体的制备感兴趣。在某些情况下,我们发现从1,3,4-噻二嗪中间体中挤出元素
硫的方法非常有用。本文简要介绍了使用此方法制备一些新的3-
苯胺基-4-
吡唑羧酸衍
生物的过程。