A Broadened Scope for the Use of Hydrazones as Neutral Nucleophiles in the Presence of H-Bonding Organocatalysts
作者:Daniel Pettersen、Raquel P. Herrera、Luca Bernardi、Franscesco Fini、Valentina Sgarzani、Rosario Fernandez、José M. Lassaletta、Alfredo Ricci
DOI:10.1055/s-2005-922791
日期:——
Using thioureas as H-bonding organocatalysts, nitroalkenes can be activated for the conjugate addition of hydrazones as neutral nucleophiles. Formaldehyde derivatives react at the azomethine carbon as expected, whereas hydrazones from enolizable aldehydes behave as ene-hydrazines and react at the α-carbon instead. Ionic liquids were found to decrease the reaction times considerably compared to
使用硫脲作为 H 键合有机催化剂,硝基烯烃可以被激活,用于腙作为中性亲核试剂的共轭加成。正如预期的那样,甲醛衍生物在偶氮甲碱碳上反应,而来自可烯醇化醛的腙则表现为烯肼并在 α-碳上反应。发现与常用溶剂相比,离子液体可显着减少反应时间,而路易斯酸的替代活化导致反应物分解。