Synthetic exploitation of the ring-opening of 3,4-dinitrothiophene. Part 7. Access to disubstituted 1,2,5-oxadiazole-2-oxides and 2-phenyl-2H-1,2,3-triazole-1-oxides
作者:Vania Armani、Carlo Dell'Erba、Novi Marino、Giovanni Petrillo、Cinzia Tavani
DOI:10.1016/s0040-4020(96)01086-1
日期:1997.2
3-bis(hydroxyimino)butanes 7, from reduction of the corresponding 1,4-disubstituted 2,3-dinitro-1,3-butadienes 2, are transformed with satisfactory yields into 3,4-disubstituted 1,2,5-oxadiazole-2-oxide 5 and 4,5-disubstituted 2-phenyl-2H-1,2,3-triazole-1-oxides 6. Dinitrobutadienes 2 are obtained from the reaction of 3,4-dinitrothiophene with diethylamine and subsequent treatment of the ensuing bis(
通过还原相应的1,4-二取代的2,3-二硝基-1,3-丁二烯2,将1,4-二烷基-和1,4-二芳基-2,3-双(羟基亚氨基)丁烷7转化为令人满意的产率成3,4-二取代的1,2,5-恶二唑-2-氧化物5和4,5-二取代的2-苯基-2 H -1,2,3-三唑-1-氧化物6。二硝基丁二烯2是由3,4-二硝基噻吩与二乙胺反应,然后用格氏试剂对随后的双(二乙氨基)丁二烯1进行处理而制得的;因此,通过开环闭环策略,整体转化代表了一种针对1,2,5-恶二唑和1,2,3-三唑系统的新颖方法。