New Efficient Route to Dissymmetric 2,4-Di(het)aryl-pyrido[3,2-<i>d</i>]pyrimidines via Regioselective Cross-Coupling Reactions
作者:Abdellatif Tikad、Sylvain Routier、Mohamed Akssira、Jean-Michel Leger、Christian Jarry、Gérald Guillaumet
DOI:10.1021/ol7014434
日期:2007.11.1
The first access to dissymmetric 2,4-di(het)aryl-pyrido[3,2-d]pyrimidines III is reported. Two mild alternative routes led to the rarely targeted compounds from 2,4-dichloro- and 2-chloro-4-isopropylsulfanyl-pyrido[3,2-d]pyrimidine by two successive palladium-catalyzed reactions involving an original regioselective chlorine discrimination. Alternatively, type III compounds were elaborated from 2 by
据报道首次接触不对称的2,4-二(杂)芳基-吡啶并[3,2-d]嘧啶III。两条温和的替代路线通过两个连续的钯催化反应(涉及原始的区域选择性氯鉴别),导致很少有针对性的化合物由2,4-二氯-和2-氯-4-异丙基硫烷基-吡啶并[3,2-d]嘧啶形成。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。这些结果为各种双官能化嘧啶系列的创新合成策略开辟了道路。