Barghi-Lish, Azam Farzaneh, Sina Mamaghani, Manouchehr One-pot, three-component, catalyst-free synthesis of novel derivatives of pyrido-[2,3-<i>d</i>]pyrimidines under ultrasonic irradiations <p>Novel derivatives of pyrido-[2,3-<i>d</i>] pyrimidines were synthesized via an efficient and catalyst- free, one-pot, three-component reaction of 3-(1-methyl-<i>1H</i>-pyrrol-2-yl)-3-oxopropanenitrile, 6-amino-(ethylthio)pyrimidine-4(<i>3H</i>)-one, and arylaldehydes under ultrasonic irradiations. This practical method furnished the desired pyridopyrimidines in high yields (79–89%) and short reaction times (25–40 min).</p> 6-Amino-(ethylthio)pyrimidine-4(3H)-one;3-(1-methyl-1H-pyrrol-2-yl)-3-oxopropanenitrile;pyrido–[2,3-d] pyrimidines;three-component reaction;ultrasonic irradiation 2016-07-13
    https://tandf.figshare.com/articles/journal_contribution/One-Pot_Three-Component_Catalyst-Free_Synthesis_of_Novel_Derivatives_of_pyrido-_2_3-_i_d_i_pyrimidines_Under_Ultrasonic_Irradiations/3413374
10.6084/m9.figshare.3413374.v2