Revisiting the three component synthesis of isoxazolo[5,4-b]pyridines, 4-aryl-3,7,7-trimethyl-isoxazolo[5,4-b]quinolin-5(6H)-ones and related heterocycles
作者:Anthony R. Lingham、John A. Hawley、Tamar Greaves、Neale Jackson、Frank Antolasic、Helmut M. Hügel
DOI:10.1016/j.poly.2016.09.011
日期:2016.12
microwave assisted synthesis between aromatic aldehydes with tetronic acid or indan-1,3-dione readily formed the Knoevenagel adducts that underwent addition of 3-methylisoxazol-5-amine 1 to form the isoxazolo[5,4-b]pyridine products 8[a,b,d,e,g] in 67–90% yield. The multicomponent reaction using dimedone formed the respective addition products 4-aryl-3,7,7-trimethyl-isoxazolo[5,4-b]quinolin-5(6H)-ones
摘要一步法三组分微波辅助合成芳族醛与四氢邻苯二甲酸或茚满-1,3-二酮很容易形成Knoevenagel加合物,然后加3-甲基异恶唑-5-胺1形成异恶唑[5,4]。 -b]吡啶产物8 [a,b,d,e,g],收率67-90%。使用二甲酮的多组分反应形成各自的加成产物4-芳基-3,7,7-三甲基-异恶唑[5,4-b]喹啉-5(6H)-酮8 [c,f,h](36-79 %)。相反,芳基醛和二甲酮与等量的甲酸2-羟基铵的超声处理仅通过水-4c产生了诺文AGEl加合物4c。当用3-氨基-5-甲基异恶唑1或3,4,5-三甲氧基苯胺14在乙醇酸-乙酸乙酯(1:1)中进行微波处理时,四氢ac啶酮15 [a,b]的产率很高(88-92%)。重要的,