A short route to functionalized imidazo[4,5- c ]carbazoles. Synthesis of the first example of the imidazo[4,5- c ]β-carboline ring system
作者:Said Achab、Khalid Diker、Pierre Potier
DOI:10.1016/s0040-4039(01)01915-3
日期:2001.12
A new synthetic route to functionalized imidazo[4,5-c]carbazoles (4) via intramolecular electrocyclization of indolo-1,3,5-hexatriene system (3a) is described. Thermally induced ring-closure of 2-ethylcarboxylate-(4-amino-5-imidazolyl)-3-indole (3d) led to the previously unknown imidazo[4,5-c]β-carboline ring system (5). These heterocycles were efficiently converted into analogs of both the marine
描述了一种通过吲哚-1,3,5-己三烯体系(3a)的分子内电环化合成功能化咪唑并[4,5- c ]咔唑(4)的新途径。热诱导的2-乙基羧酸酯-(4-氨基-5-咪唑基)-3-吲哚的闭环(3d)导致了以前未知的咪唑并[4,5 - c ]β-咔啉环系统(5)。这些杂环被有效地转化为海洋细胞毒性剂Grossularines-1和-2(1)和抗菌生物碱eudistomin U(2)的类似物。