作者:Anton Tverdokhlebov、Alexander Denisenko、Andrey Tolmachev、Yulian Volovenko
DOI:10.1055/s-2007-983713
日期:2007.6
2-(1-Substituted-2-amino-4,5-dihydro-4-oxopyrrol-3-yl)-1,3-dimethylbenzimidazolium and -3-methylbenzothiazolium chlorides were prepared by reaction of 2-(2,3-dihydro-1,3-dimethylbenzimidazol-2-ylidene)- and 2-(3-methylbenzothiazol-2-ylidene)-4-chloro-3-oxobutanenitriles with primary amines. The salts obtained were reduced to 4-(2,3-dihydro-1,3-dimethylbenzimidazol-2-yl)- and 4-(2,3-dihydro-3-methylbenzothiazol-2-yl)-1-substituted-5-aminopyrrol-3(2H)-ones. These pyrrole derivatives were shown to serve as synthetic equivalents of the corresponding 2-aminopyrrole-3-carboxaldehydes. Thus, their treatment with phenylhydrazine yielded 1-substituted 2-amino-4,5-dihydro-4-oxopyrrole-3-carboxaldehyde phenylhydrazones, whereas condensation with malonodinitrile afforded 1-substituted 6-amino-2,3-dihydro-3-oxopyrrolo[2,3-b]pyridine-5-carbonitriles.
2-(1-取代-2-氨基-4,5-二氢-4-氧代吡咯-3-基)-1,3-二甲基苯并咪唑鎓和-3-甲基苯并噻唑鎓氯化物是通过2-(2,3-二氢-1,3-二甲基苯并咪唑-2-亚基)-和2-(3-甲基苯并噻唑-2-亚基)-4-氯-3-氧代丁腈与伯胺反应制备的。所得盐被还原为4-(2,3-二氢-1,3-二甲基苯并咪唑-2-基)-和4-(2,3-二氢-3-甲基苯并噻唑-2-基)-1-取代-5-氨基吡咯-3(2H)-酮。这些吡咯衍生物被证明可作为相应2-氨基吡咯-3-甲醛的合成等价物。因此,它们与苯肼反应可生成1-取代2-氨基-4,5-二氢-4-氧代吡咯-3-甲醛苯肼,而与丙二腈缩合则生成1-取代6-氨基-2,3-二氢-3-氧代吡咯并[