A Versatile Construction of the 8H-Quino[4,3-b]carbazole Ring System as a Potential DNA Binder
摘要:
A short synthesis of the quino[4,3-b]- and quino[3,4-b]carbazoles is reported. The key step of the synthesis involves the preparation of suitable 2,3-divinylindoles by consecutive Wittig reactions. The thermal electrocyclic reaction of the divinylindole with concomitant dehydrogenation in the presence of Pd-C gave the (nitroaryl)carbazole which on reductive cyclization led to the quinocarbazole. The cleavage of the phenylsulfonyl group followed by phosphorus oxychloride treatment and subsequent displacement of the chlorine with 3-(dimethylamino)-1-propylamine gave the title compound in 25% overall yield.
DOI:
10.1021/jo00112a011
作为产物:
描述:
5-Methoxy-3-(β-Carbethoxyvinyl)-1-(phenylsulfonyl)-2-<β'-(2'-nitrophenyl)vinyl>indole 在
palladium on activated charcoal palladium on activated charcoal 作用下,
以
xylene 为溶剂,
以75%的产率得到6-Methoxy-3-carbethoxy-9-(phenylsulfonyl)-2-(2'-nitrophenyl)carbazole
参考文献:
名称:
A Versatile Construction of the 8H-Quino[4,3-b]carbazole Ring System as a Potential DNA Binder
摘要:
A short synthesis of the quino[4,3-b]- and quino[3,4-b]carbazoles is reported. The key step of the synthesis involves the preparation of suitable 2,3-divinylindoles by consecutive Wittig reactions. The thermal electrocyclic reaction of the divinylindole with concomitant dehydrogenation in the presence of Pd-C gave the (nitroaryl)carbazole which on reductive cyclization led to the quinocarbazole. The cleavage of the phenylsulfonyl group followed by phosphorus oxychloride treatment and subsequent displacement of the chlorine with 3-(dimethylamino)-1-propylamine gave the title compound in 25% overall yield.