An improved procedure for the regiospecific synthesis of electron deficient 4- and 6-substituted isatins
作者:Erica A. Kraynack、Jackline E. Dalgard、Federico C.A. Gaeta
DOI:10.1016/s0040-4039(98)01719-5
日期:1998.10
The regiospecific synthesis of 4- and 6-substituted isatins 5a-g in four steps from halonitrobenzenes 1a-g has been investigated for a variety of substrates (Scheme 1). The procedure makes use of readily available, easily handled materials and in most cases purification of neither intermediates nor final products is required. Yields of isatins are between 26 and 75% (Table 1). Improved yields of known
对于各种底物,已经研究了由卤代硝基苯1a-g分四步合成4和6取代的isatins 5a-g的区域特异性合成(方案1)。该程序利用易于获得,易于处理的材料,并且在大多数情况下,不需要纯化中间体或最终产物。伊斯兰素的收率在26%至75%之间(表1)。据报道,已知的靛红的产率提高了,并且以前没有报道过的靛红的合成也得到了报道。该方法与已知方法一起提供了合成的完整的靛红区域异构体。