Lanthanum‐Catalyzed Enantioselective Trifluoromethylation by Using an Electrophilic Hypervalent Iodine Reagent
作者:Albert Granados、Iván Rivilla、Fernando P. Cossío、Adelina Vallribera
DOI:10.1002/chem.201900598
日期:2019.6.21
A highlyenantioselectivecatalytic method for the synthesis of quaternary α‐trifluoromethyl derivatives of 3‐oxo esters is described. The reactionuses lanthanum(III) triflate and chiral PyBOX‐type C2‐symmetric ligands to generate intermediate LaIII complexes that incorporate an enolate moiety of the starting 3‐oxo ester and the trifluoromethylation transferreagent. The enantioselectivity of the
Highly Enantioselective Copper-Catalyzed Electrophilic Trifluoromethylation of β-Ketoesters
作者:Qing-Hai Deng、Hubert Wadepohl、Lutz H. Gade
DOI:10.1021/ja3039773
日期:2012.7.4
Enantioselective Cu-catalyzed trifluoromethylation of β-ketoesters using commercially available trifluoromethylating reagents is reported. A number of α-CF(3) β-ketoesters are obtained with up to 99% ee. The trifluoromethylated products were then transformed diastereoselectively to α-CF(3) β-hydroxyesters with two adjacent quaternary stereocenters via a Grignard reaction.
报道了使用市售三氟甲基化试剂对 β-酮酯进行对映选择性 Cu 催化的三氟甲基化。获得了许多具有高达 99% ee 的 α-CF(3) β-酮酯。然后通过格氏反应将三氟甲基化产物非对映选择性地转化为具有两个相邻季立体中心的 α-CF(3) β-羟基酯。