Diastereoselective Additive Trifluoromethylation/Halogenation of Isoxazole Triflones: Synthesis of All-Carbon-Functionalized Trifluoromethyl Isoxazoline Triflones
作者:Hiroyuki Kawai、Yutaka Sugita、Etsuko Tokunaga、Hiroyasu Sato、Motoo Shiro、Norio Shibata
DOI:10.1002/open.201300044
日期:2014.2
Highly functionalized 5‐trifluoromethyl‐2‐isoxazoline derivatives featuring a triflyl (SO2CF3) group at the 4‐position were successfully synthesized via diastereoselective trifluoromethylation and halogenation of isoxazole triflones using the Ruppert– Prakash reagent. The trifluoromethylation is quite general in terms of the substrates including 3,5‐diaryl isoxazole triflones and 3‐aryl‐5‐styrylisoxazole
使用 Ruppert-Prakash 试剂,通过异恶唑三氟酮的非对映选择性三氟甲基化和卤化,成功合成了在 4 位具有三氟甲基 (SO 2 CF 3 )基团的高度功能化的 5-三氟甲基-2-异恶唑啉衍生物。三氟甲基化对于包括3,5-二芳基异恶唑三氟酮和3-芳基-5-苯乙烯基异恶唑三氟酮在内的底物而言非常普遍,可提供高产率和优异的非对映选择性的产物。高功能化的5-三氟甲基-2-异恶唑啉衍生物有望成为一类新型抗寄生虫剂。因此,三氟甲磺酸基团既能激活异恶唑,又能激活CF 3加合物的4位,具有潜在的生物学功能。