An efficient and practical synthesis of 2,4-substituted pyrido[4,3-d]pyrimidin-5(6H)-ones
作者:Xinrong Tian、Dominic P. Suarez、William Hoi Hong Li、Allison K. McSherry、Robert M. Sanchez、Michael L. Moore、Jeffrey M. Axten
DOI:10.1016/j.tetlet.2019.151312
日期:2019.12
We describe an efficient synthesis of 2,4-substituted pyrido[4,3-d]pyrimidin-5(6H)-ones, which involves the acid-promoted cyclization of cyano enamine 15 to afford 2,4-bis-thiomethyl pyrido[4,3-d]pyrimidin-5(6H)-one 17 as a key intermediate. Selective displacement of the 4-methylthio group by a wide range of anilines followed by oxidation of the 2-methylthio group and subsquent substitution by amines
我们描述了2,4-取代的吡啶并[4,3- d ]嘧啶-5(6 H)-ones的有效合成,其中涉及酸促成氰基烯胺15的环化反应,从而提供2,4-双-硫代甲基吡啶基并[4,3- d ]嘧啶-5(6 ħ) -酮17,为关键中间体。通过广泛的苯胺选择性置换4-甲硫基,然后氧化2-甲硫基并随后被胺取代,使得能够合成各种2,4-二取代的吡啶并[4,3- d ]嘧啶- 5(6 H)-个。