Traceless solid-phase synthesis of 2,6,9-trisubstituted purines from resin bound 6-thiopurines
作者:Virginie Brun、Michel Legraverend、David S Grierson
DOI:10.1016/s0040-4020(02)00905-5
日期:2002.9
adapted to solid support, wherein 23 is connected to Merrifield resin via a 6-thiovaleric ester linker. The presence of the linker, in combination with the use of palladacycle type catalysts improved the yield of palladium(0)-catalyzed Suzuki and Sonogashira cross-coupling reactions. This strategy opens a new route to combinatorial chemistry library synthesis of trisubstituted purines on the solid support
由6-氯嘌呤在三个高产率步骤中获得了6-氯-2-碘-9-四氢吡喃基嘌呤(2)的制备。然后,该衍生物通过与苄硫醇反应在C-6处选择性取代,得到3,这是一种通用的中间体,用于合成2,6,9-三取代的嘌呤。钯催化的交叉偶联反应中3的反应(包括室温下的Sonogashira偶联)以及在C-2处选择性地发生胺类亲核取代。通过氧化成相应的砜将6-硫代苄基取代基活化,并用各种苄基或苯胺代替。此策略随后适应了坚实的支持,其中23通过6-硫代戊酸酯连接基连接到Merrifield树脂。连接子的存在,结合使用palladacycle型催化剂,提高了钯(0)催化的Suzuki和Sonogashira交叉偶联反应的收率。该策略为固体载体上三取代嘌呤的组合化学文库合成开辟了一条新途径。