Targeted Synthesis of 4-Chloro-3-formylthieno[2,3-b]pyridine and/or 4-Chlorothieno[2,3-b]pyridine by Reaction between N-Protected 3-Acetyl-2-aminothiophenes and Vilsmeier–Haack Reagent
作者:Gilbert Kirsch、Ahmed Abdelwahab、Atef Hanna
DOI:10.1055/s-0036-1588992
日期:2017.7
unprotected aminothiophene. Formylated chlorothieno[2,3-b]pyridine derivatives were synthesized by reaction between N-protected 3-acetyl-2-aminothiophenes and Vilsmeier–Haack reagent under classical conditions. These products were not accessible without N-protection of the starting materials or by reaction between the reagent and 4-chlorothieno[2,3-b]pyridine under any conditions. The conditions of the
摘要 在经典条件下,通过N保护的3-乙酰基-2-氨基噻吩与Vilsmeier-Haack试剂之间的反应,合成了甲酰化的氯噻吩并[2,3- b ]吡啶衍生物。没有起始原料的N-保护或在任何条件下通过试剂与4-氯噻吩并[2,3- b ]吡啶之间的反应,都无法获得这些产物。可以改变反应条件以产生比未保护的氨基噻吩反应更好的收率的未甲酰化衍生物。 在经典条件下,通过N保护的3-乙酰基-2-氨基噻吩与Vilsmeier-Haack试剂之间的反应,合成了甲酰化的氯噻吩并[2,3- b ]吡啶衍生物。没有起始原料的N-保护或在任何条件下通过试剂与4-氯噻吩并[2,3- b ]吡啶之间的反应,都无法获得这些产物。可以改变反应条件以产生比未保护的氨基噻吩反应更好的收率的未甲酰化衍生物。