A palladium-catalyzedthree-componentcouplingreaction of 2-fluoroallylic acetates with phenols, and imides is disclosed. The reaction was effectively catalyzed by [Pd(C3H5)Cl]2/DPPF in the presence of Cs2CO3, and phenols and imides were introduced onto the allyl unit through the C–F bond activation. Furthermore, the reaction proceeds with both high regioselectivity and high Z-selectivity.
公开了2-氟烯丙基乙酸酯与酚和酰亚胺的钯催化的三组分偶联反应。该反应在Cs 2 CO 3存在下被[Pd(C 3 H 5 )Cl] 2 /DPPF有效催化,通过C-F键活化将酚和酰亚胺引入到烯丙基单元上。此外,反应以高区域选择性和高Z选择性进行。
Iridium Catalysts with Chiral Imidazole-Phosphine Ligands for Asymmetric Hydrogenation of Vinyl Fluorides and other Olefins
作者:Päivi Kaukoranta、Mattias Engman、Christian Hedberg、Jonas Bergquist、Pher G. Andersson
DOI:10.1002/adsc.200800062
日期:2008.5.5
New chiral bidentate imidazole-phosphine ligands have been prepared and evaluated for the iridium-catalysed asymmetric hydrogenation of olefins. The imidazole-phosphine-ligated iridiumcatalysts hydrogenated trisubstituted olefins with the same sense of enantiodiscrimination as known iridiumcatalysts possessing oxazole and thiazole as N-donors. The imidazole-based catalysts were shown to hydrogenate
We investigated the intermolecular coupling reaction of 2-fluoroallylic acetates with simple phenols by the [Pd(C3H5)Cl]2, DPPF, and KHMDS at 100 °C for 16 h, and succeeded in obtaining 2-substituted benzofuran derivatives in good to high yield through the C–F bond activation and intermolecular cyclization.
我们研究了[Pd(C 3 H 5)Cl] 2,DPPF和KHMDS在100°C下16 h的2-氟烯丙基乙酸酯与简单酚的分子间偶联反应,并成功获得了2-取代的苯并呋喃衍生物。通过CF键活化和分子间环化,具有良好至高产的效果。
Palladium-Catalyzed Regioselective Hydroalkylation of 2-Fluoroallyl Acetates: Synthesis of Vinylmalonic Acid Ester Derivatives
The palladium-catalyzed hydroalkylation of 2-fluoroallyl acetates with the malonate anion and hydride was developed. The reaction proceeded through the C–F bond activation and provided vinylmalonic acid ester derivatives by the regioselective substitutions with the carbon nucleophile and hydride.
palladium-catalyzed double substitution of 2-haloallylic acetates with nitrogen nucleophiles. During the Pd2(dba)3/DPPE-catalyzed reaction of 2-fluoroallylic acetates with N-substituted-p-toluenesulfonamide, two equivalents of nitrogen nucleophiles were introduced to the allyl unit with a Z-selectivity through the carbon–fluorine bond cleavage. We further demonstrated the reaction of 2-chloroallylic acetates