Ketones as Electrophile in Nitroaldol Reaction: Synthesis of β,β-Disubstituted- 1,3‑dinitroalkanes and Allylic Nitro Compounds
作者:Alex Gomes、Douglas de Souza、Jeronimo Costa、Vera Lúcia Pereira
DOI:10.21577/0103-5053.20210055
日期:——
3-dinitro compounds were obtained exclusively with an overall yield of 83% through a domino nitroaldol/elimination/1,4-addition process, when excess nitromethane was added to cyclohexanone or butanone using DBU (1,8-diazabicyclo[5.4.0]undec-7-ene), as a basic catalyst. On the other hand, β-nitroalcohols could be obtained in 30-84% yield, when nitromethane reacts with different aliphatic ketones in stoichiometric
β,β-双取代-1,3-二硝基化合物通过多米诺硝基醛/消除/1,4-加成过程,当过量硝基甲烷与环己酮或丁酮在DBU (1,8-二氮杂双环[5.4.0]十一烯)作为碱性催化剂的情况下反应时,仅以总产率83%获得。另一方面,当硝基甲烷与不同脂肪酮在化学计量比下,在K2CO3(s)、Amberlyst®-A21或TBAF.3H2O (四正丁基氟化铵三水合物)/THF (四氢呋喃)的催化剂存在下反应,可以获得30-84%的β-硝基醇收率。此外,通过在少量DBU或TBAF.3H2O的催化下,对乙酰化硝基醇和醛进行处理,通过一锅消除/硝基醛反应序列,开发了一种新颖且多功能的方法来获得烯基硝基化合物。