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中文摘要：
报道了以2-甲（乙）基苯胺1a，1b为原料经Sandmeyer反应得到7-甲（乙）基靛红2a，2b;再以环境友好的聚乙二醇-400为溶剂，N-溴代丁二酰亚胺（NBS）为绿色溴代试剂对2a，2b进行5位溴代，得到5-溴-7-甲（乙）基靛红3a，3b；2a，2b，3a，3b进一步氮烃基化得到1-烃基-7-甲（乙）基靛红4a~4j和1-烃基-5-溴-7-甲（乙）基靛红5a~5j．2a，2b，3a，3b，4a～4j，5a～5j分别与硫代氨基脲，在以二氧六环为溶剂，碳酸钾存在的条件下回流反应，简便地合成了24种5H-[1，2，4]三嗪并[5，6-b]吲哚-3-硫醇类杂环化合物6a~6x．大部分化合物未见文献报道，其结构经红外光谱、质谱、核磁氢辫（碳谱1和儿素分析确认．
英文摘要：
2-Methyl（ethyl）aniline la, lb were first underwent the Sandmeyer reaction to give 7-methyl （ethyl） isatins 2a, 2b. The resulting 2a, 2b were then subjected to the bromination reaction with N-bromosuccinimide （NBS） using eco-friendly PEG-400 as solvent at room temperature to afford 5-bromo-7-methyl （ethyl） isatins 3a, 3b. Compounds 2a, 2b, 3a, 3b were further alkylated at the nitrogen atom to give the corresponding 1-alkylation-7-methyl （ethyl） isatins 4a~ 4j, and 1-alkylation-5-bromo-7-methyl（ethyl）isatins 5a~Sj. Finally, 2a, 2b, 3a, 3b, 4a~4j, 5a~Sj were subjected to the condensation reaction with thiosemicarbazide using dioxane as solvent and potassium carbonate as alkali to successfully synthesize 24 kinds of 5H-[1,2,4]triazine[5,6-b]indole-3-thiol derivatives 6a~6x. Most of compounds were new and their structures were confirmed by IR, MS, ^1H NMR and ^13C NMR spectra and elemental analyses.
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