Enantiopure 3-Amino-Substituted 1-Indanones, 1-Tetralones, and 1-Benzosuberones via Friedel–Crafts Cyclisation of ω-Aryl-β-benzamido Acids
摘要:
Conjugate addition of enantiopure lithium (R)-N-benzyl-N-(-methylbenzyl)amide to a range of -aryl-,-unsaturated esters gives the corresponding -aryl--amino esters as single diastereoisomers in high yields. Friedel-Crafts cyclisation of the pendant carbonyl group onto the -aryl ring then gives a range of 3-amino-substituted 1-indanones, 1-tetralones, and 1-benzosuberones, representing an efficient and short protocol for the preparation of these benzo-fused carbocycles in enantiopure form.
Three cis-chelating di-N-heterocyclic carbene palladium(II) complexes [PdX2(diNHC)] (X = I, 1; X = SCN, 2; X = CF3CO2, 3) bearing different anionic co-ligands were synthesized and fully characterized. A comparison of their catalytic activities in the Mizoroki–Heckreaction and conjugate addition of arylboronic acids to cyclic enones revealed increasing efficiency in the order SCN− < I− < CF3CO2−. The
三顺-chelating二- ñ -杂环卡宾钯(II)配合物[PDX 2(diNHC)](X = I,1 ; X = SCN,2 ; X = CF 3 CO 2,3)带有不同阴离子共配位合成并充分表征。在Mizoroki-Heck反应和共轭加成的芳基硼酸环状烯酮它们的催化活性的比较显示提高效率的顺序SCN -
Methionine-functionalized chitosan-Pd(0) complex: A novel magnetically separable catalyst for Heck reaction of aryl iodides and aryl bromides at room temperature in water as only solvent
作者:Abdol R. Hajipour、Zeinab Tavangar-Rizi
DOI:10.1002/aoc.3638
日期:2017.7
We report a novel catalyst system with an immobilized palladium metal‐containing magnetic nanoparticle core (ImmPd(0)‐MNPs) for the Heckreaction. ImmPd(0)‐MNPs was found to be an exceptionally mild and versatile catalyst for the Heckreaction of aryl iodides and bromides at room temperature. The catalyst was simply recovered using an external magnet from the reaction mixture and recycled six times
“TPG-lite”: A new, simplified “designer” surfactant for general use in synthesis under micellar catalysis conditions in recyclable water
作者:Ruchita R. Thakore、Balaram S. Takale、Yuting Hu、Selene Ramer、Jakub Kostal、Fabrice Gallou、Bruce H. Lipshutz
DOI:10.1016/j.tet.2021.132090
日期:2021.5
Using the oxidized, carboxylic acid-containing form of MPEG-750, esterification with racemic vitamin E affords a new surfactant (TPG-lite) that functions as an enabling, nanoreactor-forming amphiphile for use in many types of important reactions in synthesis. The presence of a single ester bond is suggestive of simplified treatment as a component of (eventual) reaction waste water, after recycling
emission spectroscopy (ICP-AES) and thermo gravimetric analysis (TGA). The catalyst has been successfully employed in Suzuki-Miyaura as well as Mizoroki–Heckcross-couplingreactions. The reactions proceed smoothly resulting in the high yields of cross-coupling products (81 to 95%) within short reaction times. The catalyst can be efficiently recovered by simple filtration and reused for multiple cycles
在本工作中,一种新型,高效,可回收的有机-无机杂化多相催化剂(Pd(II)-AMP-Cell @ Al 2 O 3通过将2-氨基吡啶共价接枝在氯丙基改性的纤维素-氧化铝复合材料上,然后与乙酸钯络合来制备)。通过扫描电子显微镜(SEM),透射电子显微镜(TEM),能量色散X射线光谱(EDX),X射线衍射(XRD),电感耦合等离子体原子发射光谱(ICP- AES)和热重分析(TGA)。该催化剂已成功用于Suzuki-Miyaura以及Mizoroki-Heck交叉偶联反应。反应平稳进行,从而在较短的反应时间内获得了高产率的交叉偶联产物(81%至95%)。可以通过简单的过滤有效地回收催化剂,并将其重复使用多次,而不会显着降低催化活性。