Ethyl 2,2-bis(4-methylphenylsulfonamido)acetate to aromatic α-amino acids: stable substrates for catalytic arylation reactions
摘要:
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.
Palladium-Catalyzed Enantioselective Three-Component Synthesis of α-Arylglycines
作者:Tamara Beisel、Andreas M. Diehl、Georg Manolikakes
DOI:10.1021/acs.orglett.6b02045
日期:2016.8.19
A general Pd-catalyzed, enantioselectivethree-componentsynthesis of α-arylglycines starting from sulfonamides, glyoxylic acid derivatives, and boronic acids was developed. This operationally straightforward procedure enables the preparation of a wide variety of α-arylglycines in high yields and excellent levels of enantioselectivity from a simple set of readily available starting materials. Incorporation
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.