Isoquinolines (IQs) and their derivatives are present in many natural products and biologically active small molecules. Herein, we report a modified procedure for the classical Pomeranz-Fritsch protocol, which expands the scope of 1,2-dihydroisoquinoline (DHIQ) products. 1,2-DHIQs are an attractive branch point for the synthesis of IQs, but because of their innate reactivity, they have remained difficult
异喹啉(IQ)及其衍
生物存在于许多
天然产物和具有
生物活性的小分子中。在此,我们报告了经典Pomeranz-Fritsch协议的修改程序,该程序扩展了1,2-二
氢异喹啉(DHIQ)产品的范围。1,2-DHIQ是合成IQ的一个有吸引力的分支点,但是由于其先天的反应性,它们仍然很难制备。我们证明了结合三
甲基甲
硅烷基
三氟甲磺酸酯(
TMSOTf)和胺碱的Fujioka / Kita条件,可以在足够温和的条件下活化Pomeranz-Fritsch环化所需的二
甲基缩醛,以制备各种1,2-DHIQ产品。我们还通过进一步功能化为还原的
四氢异喹啉(THIQ)或完全芳香化的IQ
天然产品来证明这些DHIQ的合成价值。