Two Annulated Azaheterocyclic Cores Readily Available from a Single Tetrahydroisoquinolonic Castagnoli–Cushman Precursor
作者:Elizaveta Karchuganova、Olga Bakulina、Dmitry Dar’in、Mikhail Krasavin
DOI:10.3390/molecules25092049
日期:——
A novel approach to indolo[3,2-c]isoquinoline and dibenzo[c,h][1,6]naphthyridine tetracyclic systems was discovered based on switchable reduction of 2-methoxy-3-(2-nitrophenyl)-1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxylic acid prepared via Castagnoli–Cushman reaction. Reduction with ammonium formate resulted in the expected selective transformation of the nitro group (thus providing access to
基于 2-甲氧基-3-(2-硝基苯基)-1-氧代的可切换还原,发现了一种用于吲哚[3,2-c]异喹啉和二苯并[c,h][1,6]萘啶四环系统的新方法-1,2,3,4-四氢异喹啉-4-羧酸通过 Castagnoli-Cushman 反应制备。用甲酸铵还原导致硝基的预期选择性转化(从而通过环化和脱氢获得取代的二苯并[c,h][1,6]萘啶)。然而,尝试用硫化钠还原引发了以前未知的反应级联反应,包括双重还原、环化和脱羧,导致在一个合成步骤中形成吲哚 [3,2-c] 异喹啉多杂环。