Palladium(II)-Catalyzed One-Pot Enantioselective Synthesis of Arylglycine Derivatives from Ethyl Glyoxylate,p-Toluenesulfonyl Isocyanate and Arylboronic Acids
作者:Huixiong Dai、Miao Yang、Xiyan Lu
DOI:10.1002/adsc.200700362
日期:2008.1.25
A palladium(II)-catalyzed, one-potenantioselectivesynthesis of arylglycinederivativesfromethylglyoxylate, p-toluenesulfonylisocyanate and arylboronicacids giving moderate to good yields and enantioselectivity has been developed. This reaction provides a convenient and efficient method for the synthesis of arylglycines.
Ethyl 2,2-bis(4-methylphenylsulfonamido)acetate to aromatic α-amino acids: stable substrates for catalytic arylation reactions
作者:Carolina S. Marques、Anthony J. Burke
DOI:10.1016/j.tet.2013.09.053
日期:2013.11
This paper reports the development of a novel methodology for the catalytic synthesis of aromatic alpha-amino acids, which involves the addition of aryl-organoboron reagents to alpha,alpha-ditosylamino esters derived from ethyl glyoxylate, using transition metal catalysts, like Rh and Pd. A library of alpha-amino esters (12 with Pd and 8 with Rh), was synthesized with moderate to excellent yields. A highest enantioselectivity of 30% ee was obtained using Hayashi's ligand. This method was applied to the synthesis of phenylglycine. (C) 2013 Elsevier Ltd. All rights reserved.
The invention relates to a nanoparticulate material comprising long ultrathin metal nanowires, and to processes for making it. The nanoparticulate material may be used as a catalyst and, in the presence of a chiral modifier, can catalyse enantioselective reactions.
NANOSTRUCTURED METALS
申请人:Ying Jackie Y.
公开号:US20120136164A1
公开(公告)日:2012-05-31
The invention relates to a nanoparticulate material comprising long ultrathin metal nanowires, and to processes for making it. The nanoparticulate material may be used as a catalyst and, in the presence of a chiral modifier, can catalyse enantioselective reactions.
Enantioselective Fluorination of Organic Molecules. I. Synthetic Studies of the Agents for Electrophilic, Enantioselective Fluorination of Carbanions.
作者:Yoshio TAKEUCHI、Akira SATOH、Takanori SUZUKI、Ayako KAMEDA、Masahiro DOHRIN、Toshihiro SATOH、Toru KOIZUMI、Kenneth L. KIRK
DOI:10.1248/cpb.45.1085
日期:——
develop novel methods for electrophilic and enantioselectivefluorination of active methine compounds, preliminary experiments were carried out. The N-tosyl derivative 5 obtained from D-phenylglycine was fluorinated with FClO3 or diluted F2 gas to give the N-fluoro-N-tosyl derivative 6. N-tosyl- or N-mesyl-(S)-alpha-phenethylamine 7 or 8 was subjected to FClO3 fluorination to produce the corresponding