DABCO-mediated decarboxylative cyclization of isatoic anhydride with aroyl/heteroaroyl/alkoylacetonitriles under microwave conditions: Strategy for the synthesis of substituted 4-quinolones
作者:Mugada Sugunakara Rao、Sahid Hussain
DOI:10.1016/j.tetlet.2021.153187
日期:2021.7
An efficient, 1,4-diazabicyclo[2.2.2]octane(DABCO)-mediated decarboxylative cyclization of isatoic anhydrides with active methylene groups namely aroyl/heteroaroyl/alkoylacetonitriles under microwave condition was developed for the synthesis of substituted 4-quinolones. This method utilizes commercially available substrates, occurs under mild conditions, short reaction time, good to excellent yields
开发了一种有效的 1,4-二氮杂双环 [2.2.2] 辛烷 (DABCO) 介导的具有活性亚甲基的靛红酸酐的脱羧环化反应,即在微波条件下芳酰基/杂芳酰基/烷酰基乙腈用于合成取代的 4-喹诺酮类。该方法使用市售的底物,在温和的条件下进行,反应时间短,产率好到极好,易于放大,并且与广泛的底物范围兼容。4-喹诺酮类 ( 3) 通过这种 DABCO 介导的方法获得的进一步探索,以评估它们的合成适用性。最初,4-喹诺酮衍生物被有效地转化为相应的 4-Chloro-2-phenyl-quinoline-3-carbonitriles。此外,通过钯催化的 Suzuki-Miyaura 交叉偶联 4-Chloro-2-phenyl-quinoline-3-carbonitrile 与芳基硼酸制备 2,4-Diphenyl-quinoline-3-carbonitriles。