Cu(II)-catalyzed highly enantioselective intramolecular cyclization of N-alkenylureas was developed for the concise assembly of chiral vicinal diamino bicyclic heterocycles. Facile removal of carbonyl group of the carbamido moiety allowed for ready access to enantioenriched cyclic vicinal diamines.
I<sub>2</sub>-Mediated oxidative bicyclization of 4-pentenamines to prolinol carbamates with CO<sub>2</sub> incorporating oxyamination of the CC bond
作者:Sheng Wang、Xiaowei Zhang、Chengyao Cao、Chao Chen、Chanjuan Xi
DOI:10.1039/c7gc01992k
日期:——
oxyamination reaction of alkenes with ambient CO2 is reported. In the presence of I2 and DBU, CO2 is applied in situ as a protectinggroup to regulate the nucleophilicity of the aminogroup and facilitate the bicyclization of 4-pentenamines with high chemoselectivity. Moreover, this reaction provided a feasible approach to prepare prolinol carbamates with good tolerance of functional groups and high efficiency
Palladium(II)-Catalyzed Intramolecular Diamination of Unfunctionalized Alkenes
作者:Jan Streuff、Claas H. Hövelmann、Martin Nieger、Kilian Muñiz
DOI:10.1021/ja055190y
日期:2005.10.1
Intramolecular diamination reactions are described which yield cyclic ureas as direct products of an oxidative alkene transformation in the presence of palladium acetate and iodosobenzenediacetate as terminal oxidant. The reaction is truly catalytic in metal catalyst and represents the proof of principle for this elusive type of alkene oxidation.
Bis(imidazolin-2-iminato) Rare Earth Metal Complexes: Synthesis, Structural Characterization, and Catalytic Application
作者:Alexandra G. Trambitas、Daniel Melcher、Larissa Hartenstein、Peter W. Roesky、Constantin Daniliuc、Peter G. Jones、Matthias Tamm
DOI:10.1021/ic300407u
日期:2012.6.18
Sc, Y, Lu). The molecular structures of all three compounds were established by single-crystal X-ray diffraction analyses. The coordination spheres around the pentacoordinate metal atoms are best described as trigonal bipyramids. Reaction of YbI2 with 2 equiv of LiCH2SiMe3 and 2 equiv of the imino ligand ImDippNH in tetrahydrofuran did not result in a divalent complex, but instead the Yb(III) complex
作者:Paul Benndorf、Jelena Jenter、Larissa Zielke、Peter W. Roesky
DOI:10.1039/c0cc04962j
日期:——
Enantiomerically pure lutetium complexes were synthesized as the first rare earth metal complexes containing a chiral amidinate ligand. The catalytic activity and the enantioselectivity in hydroamination reactions were studied.