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.
Alkylation of aryl 3-oxopropanedithioate and 3-amino-1-aryl-3-thioxo-1-propanones as an effective tool for the construction of differently substituted thiophenes and annulated thiophenes
The alkylation of aryl 3-oxopropanedithioate with α-haloketones under different reaction conditions afforded substituted aryl[2-(methylsulfanyl)-4-phenyl-3-thienyl]methanones and [3-aryl-5-(methylsulfanyl)-2-thienyl](phenyl)methanones. The same strategy was extended to 3-amino-1-aryl-3-thioxo-1-propanones to afford aryl[2-amino-4-phenyl-3-thienyl]methanones and ethyl 3-phenyl-5-piperidino-2-thiophene
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。
Direct Synthesis of 2-(Cycloalkylamino)-3,4-Substituted Thiophenes via Selective Deprotonation-Cyclization of Aroyl Ketene N,S-Acetals
作者:Kethiri R. Reddy、Mandava V. Basaveswara Rao、Hiriyakkanavar Ila、Hiriyakkanavar Junjappa
DOI:10.1080/00397919608004653
日期:1996.11
Acyclic and cyclic aroyl ketene N,S-acetals undergo regioselective deprotonation-cyclization viadipolestabilizedcarbanion in the presence of LDA/THF to afford the corresponding 2-(cycloalkylamino)-4-aryl or 3,4-annelated thiophenes in moderate to good yields.