N-Heterocyclic carbene-palladacyclic complexes: synthesis, characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides
作者:Feng Liu、Yuan-Yuan Hu、Di Li、Quan Zhou、Jian-Mei Lu
DOI:10.1016/j.tet.2018.07.052
日期:2018.9
a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very lowcatalystloadings (0.01 mol%).
Synthesis of N-heterocyclic carbene-Pd(II) complexes and their catalytic activity in the Buchwald-Hartwig amination of aryl chlorides
作者:Zhi-Mao Zhang、Yu-Jue Gao、Jian-Mei Lu
DOI:10.1016/j.tet.2017.11.026
日期:2017.12
Novel N-heterocyclic carbene-palladium(II) complexes using 2-picolinic acid as the ancillary ligand have been successfully developed under mild conditions. Their catalytic activity in organic synthesis has been initially tested in the Buchwald-Hartwig amination of secondary and primary amines with arylchlorides. Various substituents on both substrates can be tolerated, giving the desired coupling
Palladium-Catalysed Amination of Aryl- and Heteroaryl Halides Using<i>tert</i>-Butyl Tetraisopropylphosphorodiamidite as an Easily Accessible and Air-Stable Ligand
作者:Gheorghe-Doru Roiban、Gerlinde Mehler、Manfred T. Reetz
DOI:10.1002/ejoc.201301789
日期:2014.4
phosphorus compound tert-butyl tetraisopropylphosphorodiamidite, prepared from bis(diisopropylamino)chlorophosphine, is an excellent ligand for palladium-catalysed Buchwald–Hartwig amination of aryl- and heteroaryl chlorides and bromides. Based on its ready accessibility and air-stability, this amination protocol is a practical approach to the synthesis of industrially important aryl- and heteroarylamines.
Formamide as an Unconventional Amine Protecting Group for PET Radiochemistry
作者:Jimmy Erik Jakobsson、Gaute Grønnevik、Waqas Rafique、Karoline Hartvig、Patrick Johannes Riss
DOI:10.1002/ejoc.201800554
日期:2018.8.1
yielding radiochemistry adapted protocol utilising formamides as masking groups for secondary and tertiary amines. Selective reducing conditions were devised using borane reagents. In this protocol formamide functionalities were found to have an orthogonal reactivity to most other carbonyl functions, while effectively protectingamines from oxidative degradation. We exemplify the newly developed methodology
Switching between mono and doubly reduced odd alternant hydrocarbon: designing a redox catalyst
作者:Jasimuddin Ahmed、Paramita Datta、Arpan Das、Stephy Jomy、Swadhin K. Mandal
DOI:10.1039/d0sc05972b
日期:——
orbital (HMO) calculations in 1950, it has been well known that the odd alternant hydrocarbon (OAH), the phenalenyl (PLY) system, can exist in three redox states: closed shell cation (12π e−), mono-reduced open shell neutral radical (13π e−) and doubly reduced closed shell anion (14π e−). Switching from one redox state of PLY to another leads to a slight structural change owing to its low energy of disproportionation