A copper-catalyzed diastereoselective [4 + 2] cyclolization of α,β-unsaturated ketoxime acetates and trifluoromethyl ketones affords various 3-trifluoromethylated 3-hydroxy-cylcohexan-1-ones smoothly. This reaction features the selective functionalization of a less acidic C(sp3)–H bond by an internal oxdative C(sp3)–H functionalization strategy. Preliminary investigations revealed that α,β-unsaturated
The first oxidative C(sp3)−H/C(sp3)−H cross‐dehydrogenative coupling (CDC) reaction promoted by an internal oxidant is reported. This copper‐catalyzed CDC reaction of oxime acetates and trifluoromethylketones provides a simple and efficient approach towards 2‐trifluoromethyldihydropyrrol‐2‐ol derivatives in a highly diastereoselective manner by cascade C(sp3)−C(sp3) bond formation and cyclization
Highly Efficient Synthesis of Chiral α-CF<sub>3</sub> Amines via Rh-Catalyzed Asymmetric Hydrogenation
作者:Jun Jiang、Wenxin Lu、Hui Lv、Xumu Zhang
DOI:10.1021/acs.orglett.5b00087
日期:2015.3.6
Highly enantioselective catalyticasymmetrichydrogenation of α-CF3-enamides has been achieved by employing rhodium–DuanPhos as the catalyst, which provides a readily accessible method for the synthesis of chiral trifluoromethylated amines. The reaction has a broad substrate scope; both aryl- and alkyl-substituted α-CF3-enamides worked smoothly and afford the corresponding chiral amines in high yields
An intermolecularC(sp3)−Hamination reaction is reported that is promoted by internal oxidants and occurs via a C=N bond formation step. This intermolecularC(sp3)−Hamination reaction of trifluoromethyl ketones and aryldiazonium tetrafluoroborates affords various valuable trifluoroacetylated hydrazones in high yields with excellent E/Z selectivities. The salient features of this reaction type is