One-Pot Syntheses of Substituted 2-Aminothiazoles and 2-Aminoselenazoles via Meerwein Arylation of Alkyl Vinyl Ketones
作者:Yurii V. Ostapiuk、Andreas Schmidt、Mary Y. Ostapiuk、Oksana V. Barabash、Mykola Kravets、Colin Herzberger、Jan C. Namyslo、Mykola D. Obushak
DOI:10.1055/s-0041-1738070
日期:2022.8
Both one-pot and two-step procedures for the synthesis of substituted 2-aminothiazoles and 2-aminoselenazoles are described. Anilines are first converted into arenediazonium bromides, which are then reacted with methyl vinyl ketone or cyclopropyl vinyl ketone in the presence of copper(II) bromide to give 4-aryl-3-bromobutan-2-ones (40–71%) and 3-aryl-2-bromo-1-cyclopropylpropan-1-ones (41–79%), respectively
描述了合成取代的 2-氨基噻唑和 2-氨基硒唑的一锅法和两步法。首先将苯胺转化为溴化芳基重氮,然后在溴化铜 (II) 存在下与甲基乙烯基酮或环丙基乙烯基酮反应生成 4-aryl-3-bromobutan-2-ones (40–71%) 和 3 -aryl-2-bromo-1-cyclopropylpropan-1-ones (41–79%),分别。这些产物在没有预先分离的情况下与硫脲或硒脲反应以制备4-甲基-和4-环丙基-5-(R-苄基)噻唑-2-胺(14个实施例)及其硒类似物(14个实施例)。一锅法的产率(40-81%)高于两步法的产率(32-70%)。