N,N′-Dibenzosuberyl-1,1′-Binaphthyl-2,2′-diamine: A Highly Effective Supporting Ligand for the Enantioselective Cyclization of Aminoalkenes Catalyzed by Chelating Diamide Complexes of La(III) and Y(III)
作者:Tom Livinghouse、Khoi Huynh、Helena Lovick
DOI:10.1055/s-0033-1340186
日期:——
Enantioselective hydroamination/cyclization of representative aminoalkenes catalyzed by chelating diamide complexes of La(III) and Y(III) are described. It is noteworthy that the La(III) complex derived from the sterically demanding ( R )- N , N ′-dibenzosuberyl-1,1′-binaphthyl-2,2′-diamine proligand provides enantioselectivities that are in many cases significantly higher than those obtained with
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.
Base-catalysed asymmetric hydroamination/cyclisation of aminoalkenes utilising a dimeric chiral diamidobinaphthyl dilithium salt
作者:Patricia Horrillo Martínez、Kai C. Hultzsch、Frank Hampel
DOI:10.1039/b518360j
日期:——
A dimeric proline derived diamidobinaphthyl dilithium salt represents the first example of a chiral main group metal based catalyst for asymmetric hydroamination/cyclisation reactions of aminoalkenes.
Intramolecular Alkene Hydroamination with Hybrid Catalysts Consisting of a Metal Salt and a Neutral Organic Base
作者:Philipp C. Stegner、Christian A. Fischer、D. Thao Nguyen、Andreas Rösch、Johanne Penafiel、Jens Langer、Michael Wiesinger、Sjoerd Harder
DOI:10.1002/ejic.202000671
日期:2020.9.22
Schwesinger base tBuP4 catalyse the intramolecular alkene hydroamination of H2C=CHCH2CR2CH2NH2 [CR2=CPh2, C(CH2)5, CMe2]. Activities decrease along the row: Ca > Sr >> Mg > Ba. Hybrid catalysts consisting of tBuP4 and ZnI2, AlI3, FeCI3 or NaI were found to be fully inactive. Also, the hybrid catalyst tBuP3/CaI2 was not active which means that the base strength of the non‐nucleophilic organic base must be
由碱土金属碘化物(AeI 2)和Schwesinger碱t Bu P4组成的杂化催化剂催化H 2 C = CHCH 2 CR 2 CH 2 NH 2 [CR 2 = CPh 2,C(CH 2)5, CMe 2 ]。活性沿行减少:Ca> Sr >> Mg> Ba。发现由t Bu P4和ZnI 2,AlI 3,FeCl 3或NaI组成的杂化催化剂是完全惰性的。另外,杂化催化剂t BuP3 / CaI 2没有活性,这意味着非亲核有机碱的碱基强度必须高于t Bu P3的碱基强度(p K a BH + = 38.6)。发现t Bu P4与CaX 2(X = Cl,Br,O i Pr,OTf,NTf 2)的组合是完全无活性的,这部分可以由溶解性差解释。因此,混合催化方法仅限于t Bu P4 / CaI 2的组合但是碘化物配体可以被手性配体部分或完全代替。杂化催化剂的手性改性使分子内烯烃加氢胺ee值高达33%。