Thermal decarboxylation of 1‐phenylpyrazolium‐3‐carboxylates from the mesomeric betaine class of substances leads to pyrazole‐N‐heterocyclic carbenes, which immediately rearrange to multiply substituted 4‐aminoquinolines (see scheme). These species are of interest for the synthesis of heterocycles and pharmacologically active compounds.
消旋
甜菜碱类物质中的
1-苯基吡唑-3-
羧酸盐的热脱羧反应生成
吡唑-N-杂环卡宾,其立即重排成多个取代的
4-氨基喹啉(参见方案)。这些物质对于杂环和药理活性化合物的合成是令人感兴趣的。