据报道,从相应的2,4-二氯吡啶并嘧啶1开始,通过区域选择性官能化钯催化的CC偶联反应,合成了2,4-二取代的吡啶并[2,3- d ]嘧啶III的新颖有效途径。连续的钯催化反应,涉及原始的区域选择性氯鉴别。或者,通过C-2氯从2进一步修饰III型化合物,进一步取代用作临时C-4保护基的C-4异丙基硫烷基。进一步的Suzuki-Miyaura交叉偶联反应导致C-2和C-4双取代的化合物。
method for the preparation of 2,4-disubstituted pyrido[2,3-d]pyrimidines is reported from 2,4-dimethylsulfanyl-pyrido[2,3-d]pyrimidines through a Liebeskind-Sroglcoupling reaction involving an original selective methyl sulfanyl discrimination using UV light as a source of energy. Our strategies involve a two-step and a one-pot approach with reaction times of 11-18 h and yields ranging between 72 and 94%