Chiral ligands 2,2′-bis(dicyclohexylphosphinoamino)-1,1′-binaphthyl and 2,2′-bis[bis(3,5-dimethylphenyl)phosphinoamino]-1,1′-binaphthyl were synthesized by reacting 1,1′-binaphthyl-2,2′-diamine with dicyclohexylchlorophosphine and bis(3,5-dimethylphenyl)chlorophosphine, respectively. Application of these ligands to the Rh-catalyzed asymmetrichydrogenation of a variety of amidoacrylic acids and esters
Asymmetric Synthesis XXVIII: Novel Chiral Aminophosphine Phosphinite Ligand and Its Application in Homogenous Catalytic Asymmetric Hydrogenation of Dehydroamino Acid Derivatives
作者:Aiqiao Mi、Rongliang Lou、Yaozhong Jiang、Jingen Deng、Yong Qin、Fangmin Fu、Zhi Li、Wenhao Hu、Albert S. C. Chan
DOI:10.1055/s-1998-1821
日期:1998.8
Novel chiral aminophosphine phosphinite, DPAMPP was designed and synthesized from (1S,2R)-1,2-diphenyl-2-aminomethanol. Its cationic rhodium complex has been found to be an excellent catalyst for enantioselective hydrogenation of dehydroamino acids (more than 95.0% e.e.).
Highly Efficient Rhodium/Monodentate Phosphoramidite Catalyst and Its Application in the Enantioselective Hydrogenation of Enamides and α-Dehydroamino Acid Derivatives
作者:Xian Jia、Xingshu Li、Lijin Xu、Qian Shi、Xinsheng Yao、Albert S. C. Chan
DOI:10.1021/jo026869c
日期:2003.5.1
derived from BINOL, (S)-2,2'-O,O-(1,1'-binaphthyl)-dioxo-N,N-diethylphospholidine, was examined in the hydrogenation of both enamides and alpha-dehydroamino acid derivatives. The catalyst provided remarkably high enantioselectivities (up to 99.6% ee for enamides and >99.9% ee for alpha-dehydroamino acid derivatives).
A practical and efficient two reaction sequence one-pot process for the synthesis of Z-α-benzoylamino-acrylic acid methyl esters was developed. The process involves a potassium phosphate-catalyzed Erlenmeyerreaction of aromatic aldehydes with hippuric acid followed by an oxazolone ring-opening methanolysis. This process afforded a good overall yield and an excellent product quality via a simple workup
The synthesis of new chiral phosphine–phosphinites, phosphine–phosphoramidite, and phosphine–phosphite ligands and their applications in asymmetric hydrogenation
New chiral phosphine-phosphinite, phosphine–phosphoramiditeligands and phosphine–phosphite 1a, 1b, 2 and 3 have been synthesized and examined in the enantioselective hydrogenation of dehydroamino acid derivatives and α-aryl enamides. The results demonstrate that both rhodium-1b and rhodium-2 complexes were highly efficient catalysts in asymmetric hydrogenation reactions (up to 99.6% ee was obtained)