Chiral Base-Catalyzed Enantioselective Synthesis of 4-Aryloxyazetidinones and 3,4-Benzo-5-oxacephams
作者:Anna Koziol̷、Bartl̷omiej Furman、Jadwiga Frelek、Magdalena Woźnica、Elisa Altieri、Marek Chmielewski
DOI:10.1021/jo900821b
日期:2009.8.7
Readily available 4-formyloxyazetidinone was enantioselectively transformed into 3,4-benzo-2-hydroxy-5-oxacephams and 4-phenyloxyazetidinones upon treatment with 0.1 equiv of the cinchona alkaloid in toluene via intermolecular nucleophilic trapping of N-acyliminium intermediate by the hydroxyl moiety of phenols or o-hydroxybenzaldehydes. Additionally, the absolute configuration of title compounds was
通过将0.1当量的金鸡纳生物碱处理在甲苯中,通过分子间的亲核N-酰基lim中间体的分子间捕集,将现成的4-甲酰氧基氮杂环丁酮通过对映体选择性地转化为3,4-苯并-2-羟基-5-氧杂环丁烷和4-苯基氧基氮杂环丁酮。酚或邻羟基苯甲醛。另外,通过CD光谱法确定了标题化合物的绝对构型。