TfOH-Promoted Transition-Metal-Free Cascade Trifluoroethylation/Cyclization of Organic Isothiocyanates by Phenyl(2,2,2-trifluoroethyl)iodonium Triflate
作者:Cheng-Long Zhao、Qiu-Yan Han、Cheng-Pan Zhang
DOI:10.1021/acs.orglett.8b02793
日期:2018.10.19
An efficient and transition-metal-free method for the synthesis of the structurally diversified trifluoroethylthiol phenanthridines and 3,4-dihydroisoquinolines is described. Various 2-isothiocyanobiaryls and aryl alkyl isothiocyanates reacted with phenyl(2,2,2-trifluoroethyl)iodonium triflate in CH2Cl2 in the presence of trifluoromethanesulfonic acid at 40 °C to form the corresponding trifluoroet
描述了一种有效且无过渡金属的方法,用于合成结构上多样化的三氟乙基硫醇菲和3,4-二氢异喹啉。在三氟甲磺酸存在下,在40°C下,在CH 2 Cl 2中,各种2-异硫氰基联芳基和异硫氰酸芳基烷基酯与三氟苯基苯基(2,2,2-三氟乙基)碘鎓反应,形成相应的三氟乙基化/环化产物,其定量收率良好。 。这项工作代表了在不存在过渡金属催化剂的情况下,通过一锅法从异硫氰酸酯构建三氟乙基硫醇菲啶和异喹啉衍生物的第一个方法。