Über eine neue Methode zur positionsselektiven Einführung von Trifluormethyl-Gruppen in Heteroaromaten, Teil 3.<sup>1</sup>Lineare und angulare Verknüpfung von Ringsystemen sowie Herstellung anellierter trifluormethyl-substituierter Fünfring-Heterocyclen.
作者:Klaus Burger、Klaus Geith、Dieter Hübl
DOI:10.1055/s-1988-27511
日期:——
A New Method for Regioselective Introduction of Trifluoromethyl Groups into Heteroarenes; Part 3. Formation of Linearly and Angularly Coupled Ring Systems and Synthesis of Ring-fused Trifluoromethyl-1,3-azoles. Treatment of 4,4-bis(trifluoromethyl)-substituted hetero-1,3-dienes such as N-(hexafluoroisopropylidene)carboxamides, -thiocarboxamides, and (open-chain or hemicyclic) -amidines [e.g., 2-(hexafluoroisopropylidenamino) pyridines] with tin(II) chloride provides a new strategy for synthesis of coupled ring systems containing at least one 1,3-azole ring and of trifluoromethyl-substituted heterocyclic-fused 1,3-azoles such as imidazo[1,2-a]pyridines, imidazo[2,1-a]isoquinolines, imidazo [1,2-c]-pyrimidines, imidazo[1,2-a]pyrazines, imidazo[2,1-b]benzothiazoles, and imidazo[1,2-b][1,2,4]triazines.
向杂环烯中引入三氟甲基的区域选择性新方法;第 3 部分。线性和角度耦合环系统的形成及环融三氟甲基-1,3-唑的合成。 处理 4,4-双(三氟甲基)取代的杂-1,3-二烯,如 N-(六氟异丙亚基)羧酰胺、-硫代羧酰胺和(开链或半环状)-酰胺[如:2-(六氟异丙亚基)羧酰胺、-硫代羧酰胺和(开链或半环状)-酰胺]、2-(hexafluoroisopropylidenamino) pyridines]提供了一种新的策略,用于合成含有至少一个 1,3-azole 环的偶联环系统和三氟甲基取代的杂环融合 1、3-唑,如咪唑并[1,2-a]吡啶、咪唑并[2,1-a]异喹啉、咪唑并[1,2-c]嘧啶、咪唑并[1,2-a]吡嗪、咪唑并[2,1-b]苯并噻唑和咪唑并[1,2-b][1,2,4]三嗪。