Reactions of ketene dithioacetal for a new versatile synthesis of 4,5-substituted 3-aminothiophene-2-carboxylate derivatives
作者:Satish M. Chavan、Raghunath B. Toche、Vasant M. Patil、Pankaj B. Aware、Poonam S. Patil
DOI:10.1080/17415993.2016.1156117
日期:2016.7.3
ABSTRACT Poly substituted 3-aminothiophenes were successfully synthesized in good yields by using a one-pot protocol via ketene S,S-acetal as an intermediate in basic medium (K2CO3/N,N-dimethylformamide) followed by Dieckmann condensation with ethyl bromoacetate. Further, chemistry of thiophenes was explored using active functional groups such as C3–NH2, C4–CN and C5–SCH3 on the thiophene nucleus.
摘要 以乙烯酮 S,S-乙缩醛为基础介质 (K2CO3/N,N-二甲基甲酰胺) 中的中间体,然后与溴乙酸乙酯的 Dieckmann 缩合,采用一锅法成功合成了多取代的 3-氨基噻吩。此外,使用噻吩核上的活性官能团如 C3-NH2、C4-CN 和 C5-SCH3 探索了噻吩的化学性质。3-乙酰氨基-4-氰基-5-(甲硫基)噻吩-2-羧酸乙酯衍生物和3-氨基-4-氨基甲酰基-5-(甲硫基)噻吩-2-羧酸乙酯衍生物的合成。图形概要