作者:Riccardo Surmont、Guido Verniest、Jan Willem Thuring、Peter ten Holte、Frederik Deroose、Norbert De Kimpe
DOI:10.1039/c0ob00231c
日期:——
Synthetic routes toward new 5-amino- and 5-hydroxy-3,3-difluoropiperidines, which are of high interest as building blocks in medicinal chemistry, are described. The key step involves the N-halosuccinimide-induced cyclization of 2,2-difluoro-4-pentenylamines toward 5-halo-3,3-difluoropiperidines, which were used to synthesize 5-amino-3,3-difluoropiperidine. In a second strategy, iodolactonization of 2,2-difluoro-4-pentenoic acid gave the corresponding γ-lactone, which was transformed into 5-hydroxy-3,3-difluoropiperidine.
本研究描述了新的 5-氨基和 5-羟基-3,3-二氟哌啶的合成路线,这些化合物是药物化学中备受关注的构建基块。关键步骤是通过 N-卤代丁二酰亚胺诱导 2,2-二氟-4-戊烯胺环化,生成 5-卤代-3,3-二氟哌啶,并用其合成 5-氨基-3,3-二氟哌啶。在第二种策略中,2,2-二氟-4-戊烯酸的碘内酯化反应产生了相应的γ-内酯,并将其转化为 5-羟基-3,3-二氟哌啶。