Catalytic Enantioselective Access to Dihydroquinoxalinones via Formal α‐Halo Acyl Halide Synthon in One Pot
作者:Chiara Volpe、Sara Meninno、Carlo Crescenzi、Michele Mancinelli、Andrea Mazzanti、Alessandra Lattanzi
DOI:10.1002/anie.202110173
日期:2021.10.25
An enantioselective one-pot catalytic strategy to dihydroquinoxalinones, featuring novel 1-phenylsulfonyl-1-cyano enantioenriched epoxides as masked α-halo acyl halide synthons, followed by a domino ring-opening cyclization (DROC), is documented. A popular quinine-derived urea served as the catalyst in two out of the three steps performed in the same solvent using commercially available aldehydes,
记录了二氢喹喔啉酮的对映选择性一锅催化策略,其特征是新型 1-苯磺酰基-1-氰基对映体富集环氧化物作为掩蔽 α-卤代酰卤合成子,然后进行多米诺骨牌开环环化 (DROC)。一种流行的奎宁衍生尿素在使用市售醛、(苯磺酰基)乙腈、氢过氧化异丙苯和1,2-苯二胺的同一溶剂中进行的三个步骤中的两个步骤中充当催化剂。医学相关的 3-芳基/烷基取代的杂环通常以良好至高的总收率和高对映选择性(高达 99% ee)进行分离。展示了有机催化剂在氧化条件下大规模大规模重复使用的罕见例子。从机理上讲,不稳定的 α-酮砜已被检测为 DROC 过程中涉及的中间体。对关键环氧化步骤的理论计算使观察到的立体控制合理化,突出了磺基所发挥的重要作用。