Efficient de novo access to 2,3,6-trisubstituted pyridines was successfully synthesized through a mono- or dialkylation reaction between 4/3-alkyl-N-sulfonyl ketimines with 3-chloropropiophenones using DIPEA/NaHCO3 as a cheap cooperative basic system and subsequent aza-cyclization in the presence of NH4OAc under an air.
使用 DI
PEA/NaHCO 3作为廉价的协作基础体系,通过 4/3-烷基-N-磺酰基酮
亚胺与
3-氯代苯丙酮之间的单烷基化或二烷基化反应,成功地从头合成了 2,3,6-三取代
吡啶。随后在NH 4 OAc存在下在空气下进行氮杂环化。