Synthesis of 2,5-Dihydroxy-3-(indol-3-yl)benzoquinones by Acid-Catalyzed Condensation of Indoles with 2,5-Dichlorobenzoquinone
作者:Michael C. Pirrung、Liu Deng、Zhitao Li、Kaapjoo Park
DOI:10.1021/jo0204597
日期:2002.11.1
conjugate addition of indoles to 2,5-dichlorobenzoquinone have been developed. A wide variety of indoles substituted with halogen, alkyl, alkoxy, and aryl groups participate in anaerobic condensation reactions promoted by HCl, H2SO4, or CH3CO2H. The hydroquinone product is partially oxidized by excess dichlorobenzoquinone and fully converted to the 2,5-dichloro-3-(indol-3-yl)benzoquinone targets by
已经开发了三种将吲哚偶联到2,5-二氯苯醌上的方法。各种被卤素,烷基,烷氧基和芳基取代的吲哚参与HCl,H2SO4或CH3CO2H促进的厌氧缩合反应。对苯二酚产物被过量的二氯苯醌部分氧化,并通过DDQ或Ag2CO3氧化完全转化为2,5-二氯-3-(吲哚-3-基)苯醌目标。可以通过碱水解从二氯化物获得2,5-二羟基-3-(吲哚-3-基)苯醌。在这些反应中产生的联芳基键的旋转特性已经通过理论和光谱方法进行了检验。