Asymmetric arylation of aldimines catalyzed by heterogeneous chiral rhodium nanoparticles has been developed. The reaction proceeded in aqueousmedia without significant decomposition of the imines by hydrolysis to afford chiral (diarylmethyl)amines in high yields with outstanding enantioselectivities. This catalyst system exhibited the highest turnover number (700) in heterogeneous catalysts reported
Lewis Acid-Catalyzed Direct Amination of Benzhydryl Alcohols
作者:Vincent Terrasson、Sylvain Marque、Marie Georgy、Jean-Marc Campagne、Damien Prim
DOI:10.1002/adsc.200600236
日期:2006.10
The Lewis acid-mediated directamination of benzylic alcohols is described, providing various benzylic amine derivatives in good yields under mild and environmentally benign conditions. Among the different Lewis acids tested, gold(III) proved to be the catalyst of choice for both chemical (yield, conversion) and practical reasons (a filtration over a silica pad is generally sufficient to obtain the
The first example of simple Re2O7-catalyzed direct dehydrative coupling between allylic alcohols with electron-deficient amines has been achieved under mild and open flask conditions. The protocol has also been successfully applied to benzylic and propargylic alcohols. The mechanistic proof for the SN1-type process has also been provided.
在温和和开放的烧瓶条件下,已经实现了烯丙基醇与缺电子的胺之间简单的Re 2 O 7催化的直接脱水偶合的第一个例子。该协议也已成功应用于苄醇和炔丙基醇。还提供了用于S N 1型过程的机理证明。
Dehydrative Amination of Alcohols in Water Using a Water-Soluble Calix[4]resorcinarene Sulfonic Acid
作者:Shoichi Shimizu、Seiji Shirakawa
DOI:10.1055/s-2008-1078416
日期:2008.6
A protocol for the dehydrative amination of alcohols in water using a water-soluble calix[4]resorcinarene sulfonic acid as a reusable multifunctional catalyst was developed.
Catalytic Enantioselective Arylation of <i>N</i>-Tosylarylimines with Arylboronic Acids Using <i>C</i><sub>2</sub>-Symmetric Cationic <i>N</i>-Heterocyclic Carbene Pd<sup>2+</sup> Diaquo Complexes
作者:Guang-Ning Ma、Tao Zhang、Min Shi
DOI:10.1021/ol802861s
日期:2009.2.19
The asymmetric arylation of N-tosylimines with arylboronic acids was realized by using chiral cationic C-2-symmetric N-heterocyclic carbene (NHC) Pd2+ diaquo complex 5b as the catalyst in combination with 1.0 equiv of K3PO4 center dot 3H(2)O in THF at 4 degrees C in the presence of powdered 4 angstrom MS to afford the corresponding adducts in excellent yields (up to 99%) and good to high enantioselectivities (up to 94% ee).