作者:Riccardo Surmont、Guido Verniest、Norbert De Kimpe
DOI:10.1021/ol1019713
日期:2010.10.15
A new synthesis of fluorinated pyrazoles, a class of compounds with potential in medicinal chemistry, is described. The treatment of benzoylfluoroacetonitrile with hydrazine yielded the expected new 3-amino-4-fluoropyrazole, while the analogous reaction of α-cyano-α,α-difluoroketones with hydrazine in refluxing isopropanol surprisingly gave rise to 3-unsubstituted 4-fluoropyrazoles via an unprecedented
描述了一种氟化吡唑的新合成方法,它是一类在药物化学中具有潜力的化合物。用肼处理苯甲酰氟乙腈可得到预期的新的3-氨基-4-氟吡唑,而α-氰基-α,α-二氟酮与肼在异丙醇回流中的类似反应令人惊讶地通过空前的反应生成了3-未取代的4-氟吡唑机制。中间体肼加合物的分离导致该转化的机理基础。