2,2,2-trifluoroethanol-promoted access to symmetrically 3,3-disubstituted quinoline-2,4-diones
作者:Marcel Manke Selvero、Gabriela N. Ledesma、Ulrich Abram、Ernesto Schulz-Lang、Ademir Farias Morel、Enrique L. Larghi
DOI:10.1016/j.jfluchem.2020.109520
日期:2020.6
unprecedented use of 2,2,2-trifluoroethanol as reaction solvent provided a facile and convenient access to symmetrically 3,3-disubstitued quinoline-2,4-diones in moderate to excellent yields and high regioselectivity, by reaction of 4-hydroxy-2-quinolones with electrophiles like methyl iodide, as well as benzyl and allyl bromides in the presence of K2CO3. Silver (I) oxide is required to increase the yield of
通过2,2,2-三氟乙醇作为反应溶剂的空前使用,通过4-羟基-苯酚的反应,以中等至极好的收率和高区域选择性提供了一种方便且便捷的途径,可对称地获得3,3-二取代的喹啉-2,4-二酮。在K 2 CO 3存在下,具有亲电试剂的2-喹诺酮类化合物,如甲基碘,以及苄基和烯丙基溴。需要氧化银(I)以增加甲基化的产率。