In the presence of a Pd catalyst and a base, 6- and 2-iodopurine derivatives undergo reductive C-C dimerization with the formation of the corresponding 6,6'- or 2,2'-dimers. The best results of the dimerization were obtained in the presence of i-Pr2NEt as a base in DMF. Phosphine-free catalysts as well as catalysts containing phosphines can be used. In the presence of catalytic systems containing PPh3 the dimerization does not proceed. This dimerization may become an important side reaction in the Stille or the Suzuki-Miyaura reactions of iodopurines.
在Pd催化剂和碱存在下,6-和
2-碘嘌呤衍
生物经过还原性C-C二聚反应,形成相应的6,6'-或2,2'-二聚体。在
DMF中,使用
-Pr2NEt作为碱时,可以得到最佳的二聚化结果。可以使用不含膦的催化剂以及含膦的催化剂。在含有PPh
3的催化体系中,二聚化反应不会进行。这种二聚化反应可能成为
碘嘌呤的Stille或Suzuki-Miyaura反应的重要副反应。