Synthetic exploitation of the ring-opening of 3,4-dinitrothiophene. Access to 1,4-disubstituted 2,3-dinitro-1,3-butadienes and 2,3-butanedione dioximes
作者:Carlo Dell'Erba、Andrea Mele、Marino Novi、Giovanni Petrillo、Paola Stagnaro
DOI:10.1016/s0040-4020(01)80449-x
日期:1992.1
The optimized ring-opening reaction of 3,4-dinitrothiophene 1 with either primary or secondary amines leads to 1,4-bis(alkylamino)- and 1,4-bis(arylamino)- 2 or 1,4-bis(dialkylamino)-2,3-dinitro-1,3-butadienes 3 in satisfactory to excellent yields. While compounds 2 in solution appear to be mixtures of (Z,Z), (Z,E) and (E,E) stereoisomers, whose composition is influenced by the nature of the solvent
3,4-二硝基噻吩1与伯胺或仲胺的优化开环反应可生成1,4-双(烷基氨基)-和1,4-双(芳基氨基)-2或1,4-双(二烷基氨基) -2,3-二硝基-1,3-丁二烯3具有令人满意的优异收率。溶液中的化合物2似乎是(Z,Z),(Z,E)和(E,E)立体异构体的混合物,其组成受溶剂性质的影响,而化合物3却显示为单一的(E,E)异构体。的反应3与THF中的各种有机金属化合物表示未知的新型接入(E,E)-1,4-二烷基和(E,E)-1,4-二芳基-2,3-二硝基-1,3-丁二烯4。最后,4的两个硝基乙烯基官能团的Pb还原有效地导致相应的对称的1,4-二取代的2,3-丁二酮二肟5。