Copper and In Situ-Generated Triflic Acid Relay-Promoted Four-Component Cascade Reaction for the Construction of Polysubstituted Cycloguanidines
作者:Yiming Zhao、Run Yang、Canming Wu、Shihan Wang、Xinghua Liu、Jihui Li、Shuying Xu
DOI:10.1021/acs.joc.3c00415
日期:2023.7.7
An unprecedented copper and in situ-generated triflic acid relay-promoted four-component cascade reaction of cyanamides, diaryliodonium triflates, propargylic amines, and H2O was established for rapid and concise construction of diverse five-membered cycloguanidines. Copper-catalyzed guanidination/intramolecular hydroamination and in situ-generated HOTf-accelerated hydration proceeded sequentially
建立了前所未有的铜和原位生成的三氟甲磺酸中继促进的氰胺、二芳基碘鎓三氟甲磺酸盐、炔丙胺和H 2 O的四组分级联反应,用于快速、简洁地构建多种五元环胍。铜催化的胍基化/分子内氢胺化和原位生成的HOTf加速水合顺序进行,具有高水平的化学选择性和区域选择性,并且以高产率同时构建了6个新键。因此,二芳基碘鎓三氟甲磺酸盐不仅用作芳基化试剂,而且还用作内部酸促进剂,为高效利用二芳基碘鎓三氟甲磺酸盐建立了替代策略。