Temperature-Dependent Regioselective Synthesis of 1,2,4-Triazino[2,3-b]indazoles and 3H-1,4-Benzodiazepines by Domino-Staudinger/Aza-Wittig/Isomerization Reaction
作者:Hai Xie、Jian-Bo Yu、Ming-Wu Ding
DOI:10.1002/ejoc.201100710
日期:2011.12
o-Azidobenzaldimine 8 reacted with triphenylphosphane at 0 °C with warming to room temperature to give 1,2,4-triazino[2,3-b]indazoles 12 by a domino-Staudinger/aza-Wittig/isomerization reaction. However, when heated to 80 °C the same reaction mixture afforded 3H-1,4-benzodiazepines 14 by a tandem-Staudinger/aza-Wittig reaction.
o-叠氮苯二亚胺 8 在 0 °C 下与三苯基膦反应,同时升温至室温,通过多米诺-施陶丁格/氮杂-Wittig/异构化反应得到 1,2,4-三嗪基 [2,3-b] 吲唑 12。然而,当加热到 80 °C 时,相同的反应混合物通过串联-施陶丁格/氮杂-维蒂希反应得到 3H-1,4-苯二氮卓类 14。