Chemo- and regioselective synthesis of polysubstituted 2-aminothiophenes by the cyclization of<i>gem</i>-dibromo or<i>gem</i>-dichloroalkenes with β-keto tertiary thioamides
作者:Xuxue Zhang、Chuan Liu、Yupian Deng、Song Cao
DOI:10.1039/d0ob01821j
日期:——
A facile and practical method for the synthesis of 2,3,4-trisubstituted 2-aminothiophenes by the cyclization ofgem-dibromoalkenes orgem-dichloroalkenes with β-keto tertiary thioamides has been developed.
Synthesis of N,N-disubstituted 2-aminothiophenes by the cyclization of gem-difluoroalkenes with β-keto thioamides
作者:Xuxue Zhang、Mingsheng Wu、Juan Zhang、Song Cao
DOI:10.1039/c7ob00368d
日期:——
gem-difluoroalkenes with β-keto tertiary thioamides is described. The reactions proceed smoothly with the assistance of K2CO3 under transition-metal-free conditions, affording a variety of valuable N,N-disubstituted 2-aminothiophenes in moderate to good yields.
描述了一种新的有效的方法,该方法可通过用β-酮基叔硫酰胺环合宝石-二氟烯烃来构建高度官能化的氨基噻吩。在无过渡金属的条件下,反应在K 2 CO 3的帮助下顺利进行,以中等至良好的收率提供了各种有价值的N,N-二取代的2-氨基噻吩。
A Novel Route to Methyl 3-(3,4-Disubstituted 5-alkylthio/amino-2-thienyl) propenoates
作者:A. Datta、H. Ila、H. Junjappa
DOI:10.1055/s-1988-27638
日期:——
The 3-oxodithioesters 1 and 3-oxothioamides 6 are shown to undergo base catalyzed S-alkylation with methyl 4-bromocrotonate followed by intramolecular condensation to give the corresponding methyl 3-(3,4-disubstituted 5-alkylthio/amino-2-thienyl) propenoates 5 and 7 in good yields.