An effective and applicable deuteration method for alkyl-substituted aromatic compounds using a heterogeneous Pd/C and Pt/C mixed catalyst in deuterium oxide in the presence of a small amount of hydrogen gas was developed. Mixing a heterogeneous palladium and platinum catalyst provides an interesting synergistic effect in the H-D exchange reaction and leads to full H-D exchange results even on sterically hindered sites, which indicated only low-deuterium efficiencies when either Pd/C or Pt/C were used independently as a catalyst. We investigated the synergistic effect using a variety of substrates and proved the broad generality of the heterogeneous Pd-Pt-D2O-H2 system in the H-D exchange reaction. Furthermore, this system could be applied to a multigram scale synthesis of useful deuterium-labeled compounds, such as deuterium-labeled bis-aniline derivatives as raw materials for polyimides, aryl iodides as synthetic building blocks, and biologically active compounds.
一种有效且适用的
氘化方法被开发,用于烷基取代的芳香化合物,采用在
氘氧化物中使用小量
氢气的非均相Pd/C和Pt/C混合催化剂。混合的非均相
钯和
铂催化剂在氢-
氘交换反应中提供了有趣的协同效应,并且即使在空间位阻较大的位点上也能实现完全的氢-
氘交换,而当单独使用Pd/C或Pt/C作为催化剂时,仅能获得低
氘效率。我们使用多种底物研究了这种协同效应,并证明了非均相Pd-Pt-D2O-H2体系在氢-
氘交换反应中的广泛适用性。此外,该体系可以应用于多克级有用
氘标记化合物的合成,如
氘标记的双
苯胺衍
生物,作为聚
酰亚胺的原材料,芳基
碘化物作为合成构件,以及
生物活性化合物。