A simple synthesis of 1,3-dialkylpyrido(2,3-d)pyrimidines.
作者:TSUNEO ITOH、TOSHIHIKO IMINI、HARUO OGURA、NORIO KAWAHARA、TAKAKO NAKAJIMA、KYOICHI A. WATANABE
DOI:10.1248/cpb.33.1375
日期:——
A new and convenient synthesis of 1, 3-dialkylpyrido [2, 3-d] pyrimidine-2, 4 (1H, 3H)-diones from 6-allylamino-and 6-(substituted allyl) aminouracils by PdCl2-CuCl-O2-catalyzed oxidative cyclization is described. Further, 1, 3-dimethylpyrido [2, 3-d] pyrimidine 2, 4 (1H, 3H)-dione (4a) was prepared by the reaction of 6-allylamino-1, 3-dimethyluracils (3a) with (AcO)2 Pd and by the thermal cyclization of 3a.
描述了一种新颖且便利的合成方法,通过PdCl2-CuCl-O2催化的氧化环化反应,从6-烯丙基氨基和6-(取代烯丙基)氨基尿嘧啶合成1, 3-二烷基吡啶[2, 3-d]嘧啶-2, 4(1H,3H)-二酮。此外,1, 3-二甲基吡啶[2, 3-d]嘧啶-2, 4(1H,3H)-二酮(4a)是通过6-烯丙基氨基-1, 3-二甲基尿嘧啶(3a)与(AcO)2 Pd反应以及3a的热环化反应制备的。