The preliminary results of a regiospecific synthesis of (Z)-1-(2-nitrobenzylidene)isochroman-3-ones by gold(I)-catalyzed cycloisomerization of phenylethynylacetic acids under mild conditions is described. These novel lactones proved to be suitable starting materials for a new, general access to 5H-benzo[b]carbazole-6,11-diones.
本文介绍了在温和条件下通过
金(I)催化
苯乙炔基
乙酸的环异构化反应,以区域特异性合成 (Z)-1-(2-nitrobenzylidene)isochroman-3-ones 的初步结果。这些新型内酯被证明是一种新的、通用的 5H-苯并[b]
咔唑-6,11-二酮的合适起始原料。