Cyanoacetamide in heterocyclic chemistry: Synthesis, antitumor and antioxidant activities of some new benzothiophenes
作者:Serry A. A. El Bialy、Moustafa A. Gouda
DOI:10.1002/jhet.634
日期:2011.11
Cyanoacylation of 2‐amino‐tetrahydrobenzothiophene‐3‐carboxylate ethyl ester with 3‐(3,5‐dimethyl‐1H‐pyrazol‐1‐yl)‐3‐oxopropanenitrile afforded cyanoacetamide 2. The later was utilized as key intermediate for the synthesis of 3‐substituted 2‐iminocoumarins 3, 4, 5, 6 and acrylamides 7a, b via Knoevenagel condensation with 2‐hydroxy‐1‐naphthaldehyde; 2‐hydroxybenzaldehyde; 1‐nitrosonaphthalen‐2‐ol; 7‐hydr
2-氨基-四氢苯并噻吩-3-羧酸乙酯与3-(3,5-二甲基-1H-吡唑-1-基)-3-氧代丙烷腈的氰化反应可得到氰基乙酰胺2。在后来被用作关键中间体的3-取代的2- iminocoumarins合成3,4,5,6和丙烯酰胺图7a,b 通过Knoevenagel缩合用2-羟基-1-萘醛; 2-羟基苯甲醛; 1-亚硝基萘-2-醇; 7-羟基-5-甲氧基-2-甲基-4-氧代-4 H-色烯-6-甲醛; 4-二甲氨基苯甲醛; 和4-哌啶-1-基苯甲醛的乙醇/哌啶溶液。导数7a,b用苯肼处理后不提供吡唑8a,b。此外,将2与4-氨基-1,5-二甲基-2-苯基-1 H-吡唑-3(2 H)-one和4,6-二甲基-1 H-吡咯并[2,3- b ]偶联吡啶-3-胺分别提供了derivatives衍生物9和10。将后来的衍生物10在乙酸中环化,得到吡啶并吡唑并三嗪11。最后,将2用二甲基甲酰胺-二甲基乙缩醛(