作者:Jaehun Jung、Eunjin Kim、Youngmin You、Eun Jin Cho
DOI:10.1002/adsc.201400542
日期:2014.9.15
Difluoroalkylated aromatics are important structural motifs in pharmaceutical and agrochemical applications. Herein, we report their synthesis by a mild, efficient, and convenient method using visible light photoredox catalysis. A variety of unactivated aromatics were difluoroalkylated with ethyl 2‐bromo‐2,2‐difluoroacetate (BrCF2CO2Et) in the presence of the triscyclometalated Ir complex fac‐[Ir(ppy)3]
在医药和农业化学应用中,二氟烷基化的芳族化合物是重要的结构基序。在本文中,我们报告了使用可见光光氧化还原催化的温和,有效和方便的方法合成它们。在室温下可见光下,在三环金属化Ir络合物fac- [Ir(ppy)3 ]存在下,将各种未活化的芳族化合物用2-溴-2-2,2-二氟乙酸乙酯(BrCF 2 CO 2 Et)进行二氟烷基化。结果表明,含有CF 2 CO 2 Et部分的反应产物可以转化为多种其他含CF 2的芳烃,证明了本方法的合成效用。
Palladium-Catalyzed C–H Ethoxycarbonyldifluoromethylation of Electron-Rich Heteroarenes
first Pd-catalyzed C–H ethoxycarbonyldifluoromethylation with BrCF2CO2Et has been developed. The use of a bidentate phosphine ligand (Xantphos) is critical for the reaction to occur. A variety of electron-richheteroarenes, including indoles, furans, thiophenes, and pyrroles, can be ethoxycarbonyldifluoromethylated in moderate to excellent yields. The reactions take place at the C–H bonds adjacent to
已经开发出了第一个由BrCF 2 CO 2 Et催化的Pd催化的C–H乙氧基羰基二氟甲基化反应。双齿膦配体(Xantphos)的使用对于反应的发生至关重要。各种电子富集的杂芳烃,包括吲哚,呋喃,噻吩和吡咯,都可以以中等至极好的收率被乙氧基羰基二氟甲基化。反应发生在杂原子附近的CH键上,具有很高的区域选择性。该方法为将二氟烷基引入富电子杂芳烃提供了新的协议。