Cyclocondensation of α-Oxoketene<i>N,S</i>-Acetals with β-Lithioamino-β-Substituted Acrylonitriles: A Facile Route to 2,6-Substituted 4-Amino-3-cyanopyridines
作者:Janagani Satyanarayana、Hiriyakkanavar Ila、Hiriyakkanavar Junjappa
DOI:10.1055/s-1991-26602
日期:——
A novel synthesis of a variety of 2,6-substituted and 3-cyano-4-dialkylamino-2,6-diheteroarylpyridines (4-dialkylamino≡pyrrolidin-1-yl, piperidino, morpholino, diethylamino and N-methylanilino; 6-heteroaryl≡phenyl, anisyl, 2-thienyl; 2-heteroaryl≡methyl, phenyl, 2-furyl and 2-thienyl) has been developed by the reaction of α-oxoketene N,S-acetals 1 with β-substituted β-lithioaminoacrylonitriles 2, generated in situ by either self condensation of lithioacetonitrile or by its reaction with substituted acetonitriles.
多种2,6-取代和3-氰基-4-二烷基氨基-2,6-二杂芳基吡啶(4-二烷基氨基=吡咯烷-1-基、哌啶基、吗啉代、二乙氨基和N-甲基苯胺基;6-杂芳基)的新合成ε-氧代烯基 N,S-乙缩醛 1 与 β-取代的 β-锂氨基丙烯腈 2 反应生成 ϋ苯基、茴香基、2-噻吩基;2-杂芳基 ώ甲基、苯基、2-呋喃基和 2-噻吩基) ,通过锂乙腈的自缩合或通过其与取代的乙腈的反应而原位生成。