Regioselective Amination or Alkoxylation of Halogenated Amino-, Thio- or Alkoxypyridines via Pyridyne Intermediates
作者:Paul Knochel、Benjamin Heinz、Dimitrije Djukanovic、Fiona Siemens、Mohamed Idriess、Benjamin Martin
DOI:10.1055/s-0037-1610786
日期:2022.11
bearing an R-substituent in position 2 (R = OEt, NEt2, N-piperidyl, or SEt) or in position 5 (R = OMe, OEt, SEt, NMe2, NEt2, or aryl) with KHMDS and an amine at 25 °C for 12 hours in THF provided regioselectively 3- and 4-aminated pyridines in 56–90% yields. The reaction of 3-bromo-2-diethylaminopyridine with various alcohols in the presence of t-BuOK/18-crown-6 in THF at 80 °C for 20–60 hours gave various
处理在位置 2(R = OEt、NEt 2、N-哌啶基或 SEt)或位置 5(R = OMe、OEt、SEt、NMe 2、 NEt 2或芳基)与 KHMDS 和胺在 25°C 下在 THF 中保持 12 小时,以 56-90% 的产率提供区域选择性的 3- 和 4- 胺化吡啶。在t -BuOK/18-crown-6存在下,3-溴-2-二乙氨基吡啶与各种醇在80°C 的 THF 中反应 20-60 小时,在 61-81 中得到各种 4-烷氧基-2-二乙氨基吡啶% 产量。这些取代反应被提议通过吡啶中间体进行。