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。