本文描述了一种有效的方法,将可见光驱动的异氰酸酯基自由基二氟甲基化处理,以使用各种二氟甲基化菲啶和异喹啉。在光氧化还原催化下,亲电S-(二氟甲基)二芳基ulf盐被证明是良好的二氟甲基自由基前体。在温和的条件下,宽范围的异氰化物可以中等至极好的收率提供相应的二氟甲基化菲啶,异喹啉,呋喃[3,2- c ]吡啶和吡啶并[3,4- b ]吲哚。还提出了一个合理的机制。
Selective synthesis of 5,6-dihydrophenanthridines, 5,6-dihydrobenzo[c][1,8]naphthyridines and their fully aromatized analogues via the Pictet–Spengler reaction mediated by peptide coupling agent propylphosphonic anhydride (T3P)
A new method has been developed for the selective synthesis of 5,6-dihydrophenanthridines, 5,6-dihydrobenzo[c][1,8]naphthyridines and their fully aromatized analogues via the Pictet–Spengler reaction mediated by propylphosphonic anhydride (T3P). The method, which uses less toxic and readily available T3P, generally seems to be more flexible, efficient in the preparation of 5,6-dihydrophenanthridine
已开发出一种新方法,用于通过丙基膦酸酐(T3P)介导的Pictet-Spengler反应选择性合成5,6-二氢菲啶,5,6-二氢苯并[ c ] [1,8]萘啶及其完全芳构化的类似物。使用毒性较小且易于获得的T3P的方法通常似乎更灵活,更有效地制备5,6-二氢菲啶衍生物,并且与制备吡啶的常规方法相辅相成。
Photoredox-catalyzed addition of isocyanides with boracene-based alkylborate: Construction of 6-alkylphenanthridine
作者:Li Liu、Xingkang Yu、Wenyan Zhao、Shuo Yuan、Qian Liu、Yage Zhang、Chunping Dong、Jian Li
DOI:10.1016/j.tetlet.2023.154881
日期:2024.1
An efficient synthesis of a variety of 6-alkylated phenanthridine via a cyclization reaction by photoredox catalysis between 2 and isocyanobiaryls and alkylborates is reported. A range of 2-isocyanobiaryls was tolerated well. This cyclization reaction displays excellent functional group tolerance and broad substrate scope, allowing access to desired products in good to excellent yields.