Safe cyano(nitro)methylating reagent—Michael addition of cyano-aci-nitroacetate leading to δ-functionalized α-nitronitriles
作者:Haruyasu Asahara、Kyo Muto、Nagatoshi Nishiwaki
DOI:10.1016/j.tet.2014.07.013
日期:2014.9
A practical, convenient, and safe cyano(nitro)methylation method was developed, in which cyano-aci-nitroacetate served as a synthetic equivalent of anionic nitroacetonitrile. A control of the single/double Michael additions was achieved, which enabled the synthesis of unsymmetrical double Michael adducts. Moreover, the Michael adducts can be used as precursors of pyridine and naphthyridine frameworks. (C) 2014 Elsevier Ltd. All rights reserved.
Synthesis of vicinally functionalized 1,4-dihydropyridines and diazabicycles via a pseudo-intramolecular process
An alpha-nitro-delta-keto nitrile readily forms the corresponding ammonium salt immediately upon treatment with an amine. When the amine liberated under equilibrium, the nucleophilic amine and the electrophilic keto nitrile come close to each other to afford so-called an intimate pair. The spatial proximity realized an efficient reaction to give a 2-amino-3-nitro-1,4-dihydropyridine; the reaction proceeded like an intramolecular reaction although it is actually an intermolecular reaction, namely the pseudo-intramolecular reaction. The bifunctionality of the keto nitrile also enabled the pseudo-intramolecular imination followed by tandem cyclization leading to diazabicyclic frameworks. (C) 2013 Elsevier Ltd. All rights reserved.
Bicyclization involving pseudo-intramolecular imination with diamines
α-Nitro-δ-keto
nitriles and α-nitro-δ-keto ester were readily converted to diazabicyclo compounds having vicinal functionality upon treatment with diamines. The keto nitrile attracts the diamine nearby to an acidic hydrogen to cause the pseudo-intramolecular imination which proceeds efficiently without any catalyst at room temperature.