Synthesis of 6,8,9-Tri- and 2,6,8,9-Tetrasubstituted Purines by a Combination of the Suzuki Cross-coupling, N-Arylation, and Direct C−H Arylation Reactions
作者:Igor Čerňa、Radek Pohl、Blanka Klepetářová、Michal Hocek
DOI:10.1021/jo8018126
日期:2008.11.21
methodology of synthesis of a several types of di-, tri-, and tetraarylpurine derivatives by a combination of regioselective Suzuki cross-coupling reactions and/or Cu-catalyzed N-arylation with direct C-H arylations was developed. 6,8-Diaryl- and 2,6,8-triaryl-9-isopropylpurines were prepared by one or two cross-couplings of 6-chloro- or 2,6-dichloro-9-isopropylpurine with arylboronic acids followed by
通过区域选择性的Suzuki交叉偶联反应和/或Cu催化的N-芳基化与直接CH芳基化的组合,开发了几种类型的二芳基,三芳基和四芳基嘌呤衍生物的合成的新型实用方法。通过将6-氯-或2,6-二氯-9-异丙基嘌呤与芳基硼酸进行一次或两次交叉偶联,然后进行Pd催化,可制备6,8-二芳基-和2,6,8-三芳基-9-异丙基嘌呤由芳基卤化物进行CH芳基化至位置8。6-氯嘌呤和腺嘌呤与硼酸进行Cu催化的N-芳基化至位置9,然后与AlMe3交叉偶联和/或CH芳基化获得8,9-二芳基-6-甲基嘌呤或8,9-二芳基腺嘌呤(在位置6处带有腺嘌呤的部分N-芳基化产物)。该方法适用于构建修饰嘌呤的小型文库。