Ahluwalia, V. K.; Sharma, Pooja; Goyal, Bindu, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1997, vol. 36, # 10, p. 920 - 922
Acid catalyzed Knoevenagel condensation of thiobarbituric acid and aldehyde at room temperature
作者:Vinod D. Deotale、Madhukar G. Dhonde
DOI:10.1080/00397911.2020.1751203
日期:2020.6.2
Knoevenagel reactions have been performed by the action of various unsymmetrical thiobarbituric acids containing activated methylene carbon and electron deficient center of aromatic aldehydes using small amount of acetic acid as initiator in ethanolic medium. The present protocol proceeded smoothly on roomtemperature stirring using ethyl alcohol as solvent with the help of initiator. The work-up procedure
摘要 在乙醇介质中,以少量乙酸为引发剂,通过各种含有活化亚甲基碳和芳醛缺电子中心的不对称硫代巴比妥酸的作用,进行了Knoevenagel反应。本协议在室温搅拌下使用乙醇作为溶剂在引发剂的帮助下顺利进行。后处理程序非常简单,产品已通过简单的重结晶纯化。因此,该方法学是好的,并且所有合成的分子都通过 1H、13C NMR 和 MS 光谱进行表征。图形概要
Desulfurization of thioureas, benzimidazoline-2-thiones and 1,3-dihydro-1,3-diaryl-2-thioxopyrimidine-4,6(2H,5H)-diones with nickel boride at ambient temperature1
作者:Jitender M. Khurana、Gagan Kukreja、Geeti Bansal
DOI:10.1039/b206398k
日期:2002.11.13
Nickel boride is reported to bring about desulfurization and reductive cleavage of N,N′-diarylthioureas to give corresponding anilines and N-methylanilines while N,N′-dialkylthioureas have been observed to undergo desulfurization to give formamidines; benzimidazoline-2-thiones are reported to undergo desulfurization to benzimidazoles and 1,3-dihydro-1,3-diaryl-2-thioxopyrimidine-4,6(2H,5H)-diones have been observed to yield corresponding hexahydropyrimidine-4,6-diones in high yields in dry methanol at ambient temperature.