Facile Synthesis of Substituted 4-Alkoxy-2-oxazolines and Exploration of the Reaction Mechanism
作者:Bo Li、Jiye Shi、Weiliang Zhu、Jianming Zhu、Xiaolong Li、Guimin Wang、Zhijian Xu、Shikai Tian、Adrian Hall、Jingshan Shen
DOI:10.1055/s-0035-1561386
日期:——
4-alkoxy-2-oxazolines. The proposed reaction mechanism has been validated by quantum chemistry calculations, key intermediate synthesis, and NMR spectra. Substituted 4-alkoxy-2-oxazolines have been synthesized via the reaction of nitriles with beta-hydroxyacetals promoted by trifluoromethanesulfonic acid. The reaction is proposed to be initiated by the protonation of the acetals to produce carbocations that are then
摘要 通过腈与由三氟甲磺酸促进的β-羟基缩醛的反应合成了取代的4-烷氧基-2-恶唑啉。提议该反应通过缩醛的质子化来引发,以产生碳阳离子,然后该碳阳离子被腈的氮原子攻击,随后进行分子内环化反应以形成4-烷氧基-2-恶唑啉。所提出的反应机理已通过量子化学计算,关键中间体合成和NMR光谱进行了验证。 通过腈与由三氟甲磺酸促进的β-羟基缩醛的反应合成了取代的4-烷氧基-2-恶唑啉。提议该反应通过缩醛的质子化来引发,以产生碳阳离子,然后该碳阳离子被腈的氮原子攻击,随后进行分子内环化反应以形成4-烷氧基-2-恶唑啉。所提出的反应机理已通过量子化学计算,关键中间体合成和NMR光谱进行了验证。