A three‐step, one‐pot tandem reaction including radical nucleophilic alkylation/cyclization/aromatization was developed using 0.3 equivalents of silver(I) acetate (AgOAc) as the catalyst and 2 equivalents of ammonium persulfate [(NH4)2S2O8] as the oxidant. This strategy is highly efficient for the assembly of pentacyclic complex carbazoles from aryl‐fused bromobenzoquinones and indol‐3‐ylpropanoic
使用0.3当量的乙酸银(I)(AgOAc)作为催化剂和2当量的过硫酸铵[(NH 4)2 S 2 O 8 ]作为氧化剂。这种方法对于从芳基稠合的溴苯醌和吲哚-3-基丙酸组装五环复合咔唑的总收率(三步)为52-72%,效率很高。该新方法相对于先前报道的方法提供了显着改进,并且将极大地促进五环复合咔唑的类似物文库的构建,并有利于这些化合物的进一步生物学评估。
A concise synthesis of novel naphtho[a]carbazoles and benzo[c]carbazoles
作者:Rakhi Pathak、Johanna M. Nhlapo、Sameshnee Govender、Joseph P. Michael、Willem A.L. van Otterlo、Charles B. de Koning
DOI:10.1016/j.tet.2006.01.012
日期:2006.3
Starting from simple indole precursors the synthesis of naphtho[a]carbazoles and benzo[c]carbazoles is described. Key steps include the use of the Suzuki–Miyaura reaction to afford 2- or 3-aryl substituted indoles, as well as a potassium t-butoxide and light assisted aromatic ring-forming reaction.
从简单的吲哚前体开始,描述了萘并[ a ]咔唑和苯并[ c ]咔唑的合成。关键步骤包括使用Suzuki-Miyaura反应提供2-或3-芳基取代的吲哚,以及叔丁醇钾和光辅助的芳香环形成反应。