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
3,3‘-Bis(trisarylsilyl)-Substituted Binaphtholate Rare Earth Metal Catalysts for Asymmetric Hydroamination
作者:Denis V. Gribkov、Kai C. Hultzsch、Frank Hampel
DOI:10.1021/ja058287t
日期:2006.3.1
Chiral 3,3'-bis(trisarylsilyl)-substituted binaphtholate rare earth metal complexes (R)-[LnBinol-SiAr3}(o-C6H4CH2NMe2)(Me2NCH2Ph)] (Ln = Sc, Lu, Y; Binol-SiAr3 = 3,3'-bis(trisarylsilyl)-2,2'-dihydroxy-1,1'-binaphthyl; Ar = Ph (2-Ln), 3,5-xylyl (3-Ln)) and (R)-[LaBinol-Si(3,5-xylyl)3}E(SiMe3)2}(THF)2] (E = CH (4a), N (4b)) are accessible via facile arene, alkane, and amine elimination. They are efficient
Organolanthanide-catalyzed hydroamination. A kinetic, mechanistic, and diastereoselectivity study of the cyclization of N-unprotected amino olefins
作者:Michel R. Gagne、Charlotte L. Stern、Tobin J. Marks
DOI:10.1021/ja00027a036
日期:1992.1
regiospecific Cpsup prime}}sub2}LnR (Cpsup prime}} = eta}sup 5}-Mesub 5}Csub 5};R = H, CH(TMS)sub2}, eta}sup 3}-Csub3}Hsub 5}, N(TMS)sub2}; Ln-La,Nd,Sm,Y,Lu)-catalyzed hydroamination/cyclization of the amino olefins Hsub2}NCHRsup 1}Rsup 2}CH=CHsub2} to yield heterocycles. Kinetic isotope effects are observed for some of the cyclizations. The complexes were synthesized to model
N-<i>t</i>-Butoxycarbonyl Protection of Primary and Secondary Amines in the Hydroboration Reaction: Synthesis of Amino Alcohols
作者:George W. Kabalka、Nan-Sheng Li、R. David Pace
DOI:10.1080/00397919508015894
日期:1995.7
Abstract The use of the BOC group as a protecting group in the hydroboration of aminoalkenes is described. The isolated yields of amino alcohols via the hydroboration-oxidation sequence are excellent.
Intramolecular Hydroamination of Aminoalkenes by Calcium and Magnesium Complexes: A Synthetic and Mechanistic Study
作者:Mark R. Crimmin、Merle Arrowsmith、Anthony G. M. Barrett、Ian J. Casely、Michael S. Hill、Panayiotis A. Procopiou
DOI:10.1021/ja9003377
日期:2009.7.22
aminoalkenes. The reactions proceeded under mild conditions, allowing the synthesis of five-, six-, and seven-membered heterocyclic compounds. Qualitative assessment of these reactions revealed that the ease of catalytic turnover increases (i) for smaller ring sizes (5 > 6 > 7), (ii) substrates that benefit from favorable Thorpe-Ingold effects, and (iii) substrates that do not possess additional substitution