An iridium-catalyzed C–H allylation of acrylamides with conjugated dienes was developed, using NH-Ts amide as the directing group. The ligand- and additive-free protocol provided a convenient and atom economic synthesis of branched 1,4-diene skeletons, enabling the tolerance of a wide scope of functionalities such as OMe, F, Cl, Br and CF3. The utility of this protocol is also demonstrated by a preparative
A practical and atom-economic protocol for the stereoselective preparation of various 1,4- and 1,3-diene skeletons through iridium-catalyzed directed olefinic C–H allylation and alkenylation of NH-Ts acrylamides in water was developed. This reaction tolerated a wide scope of substrates under simple reaction conditions and enabled successful gram-scale preparation. Furthermore, an asymmetric variant
Annulation of α,β-unsaturatedamides with electron-deficient 1,3-dienes gave 5,6-dihydropyridin-2(1H)-ones in the presence of a hydroxoiridium catalyst. The reaction proceeded via direct C–H alkyla...
Highly Regioselective Rh<sup>III</sup>-Catalyzed Thiolation of <i>N</i>-Tosyl Acrylamides: General Access to (<i>Z</i>)-β-Alkenyl Sulfides
作者:Can Liu、Yi Fang、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/acs.orglett.8b02552
日期:2018.10.5
with good tolerance of functional groups. Turnover numbers (TONs) of up to 7100 were obtained utilizing 0.01 mol % RhIII catalyst. In addition, diphenyldiselenide was also successfully applied to this reaction for the construction of (Z)-β-alkenyl selenides under identical conditions.
Directing-Group-Assisted Copper-Catalyzed Olefinic Trifluoromethylation of Electron-Deficient Alkenes
作者:Chao Feng、Teck-Peng Loh
DOI:10.1002/anie.201307245
日期:2013.11.18
Assistance provided: The directing group in the title reaction not only activates the substrates but also allows the stereospecific formation of cis‐trifluoromethylated products. The reaction is operationally simple and tolerates a wide variety of functional groups, thus providing an efficient method for the stereoselective synthesis of β‐CF3‐functionalized acrylamide derivatives.