AbstractVarious indole-containing compounds have shown impressive pharmaceutical activities against a variety of diseases. However, the functionalization of indoles usually relies on systems that use organic solvents, which do not meet the criteria for green and sustainable chemical development. To address this issue, regiospecific sulfenylation, selenylation, and telluration of indoles were developed using H2O as solvent. The highly efficient chalcogenylation of indoles was achieved utilizing CsOH as a promoter, thus avoiding the use of expensive transition-metal catalysts. This newly developed protocol is characterized by its outstanding features including simple operation, mild conditions, wide substrate scope, excellent functional group tolerance, and recyclability, leading to the convenient synthesis of 3-chalcogenyl-indoles.
摘要 各种含吲哚的化合物在治疗多种疾病方面表现出令人印象深刻的药物活性。然而,吲哚的功能化通常依赖于使用有机溶剂的体系,这不符合绿色和可持续化学发展的标准。为解决这一问题,我们以 H2O 为溶剂,开发了吲哚的区域特异性亚硫酰化、硒化和碲化反应。利用 CsOH 作为促进剂实现了吲哚的高效缩醛化,从而避免了使用昂贵的过渡金属催化剂。这一新开发的方案具有操作简单、条件温和、底物范围广、官能团耐受性好和可回收等突出特点,可方便地合成 3-醛基吲哚。