Highly Enantioselective Copper(I)-Catalyzed Conjugate Addition of Terminal Alkynes to 1,1-Difluoro-1-(phenylsulfonyl)-3-en-2-ones: New Ester/Amide Surrogates in Asymmetric Catalysis
作者:Amparo Sanz-Marco、Andrea García-Ortiz、Gonzalo Blay、Isabel Fernández、José R. Pedro
DOI:10.1002/chem.201303920
日期:2014.1.13
highly enantioselective copper‐catalyzed conjugate alkynylation of monoactivated enones, namely 1,1‐difluoro‐1‐(phenylsulfonyl)‐3‐en‐2‐ones, is described. The reaction products are obtained with good yields and excellent enantioselectivities (from 92 to 99% ee). The β‐alkynylated difluoro(phenylsulfonyl) ketones can be converted into the corresponding β‐alkynylated difluoro‐ and trifluoromethyl ketones
描述了单活化的烯酮,即1,1-二氟-1-(苯磺酰基)-3-烯-2-酮的高度对映选择性的铜催化共轭烷基化。得到的反应产物具有良好的收率和优异的对映选择性(从92%至99%ee)。β-炔基化的二氟(苯磺酰基)酮可以转化为相应的β-炔基化的二氟和三氟甲基酮,酯和酰胺。这是在对映选择性反应中使用1,1-二氟-1-(苯磺酰基)-3-烯-2-酮作为底物的第一个例子,已证明是新的酯/酰胺替代物。