作者:Xiang Ji、Zheng Huang、Jean-Philip Lumb
DOI:10.1021/acs.joc.9b02987
日期:2020.1.17
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。