Visible-Light-Induced Photocatalytic Aerobic Oxidative C<sub>sp3</sub>–H Functionalization of Glycine Derivatives: Synthesis of Substituted Quinolines
作者:Xiaorong Yang、Liqi Li、Ying Li、Yuan Zhang
DOI:10.1021/acs.joc.6b02683
日期:2016.12.16
with unactivated alkenes has been accomplished. This visible light-driven protocol has been successfully applied to a broad scope of glycine esters and simple alkenes, giving rise to diverse substitutedquinoline derivatives in 18–84% yield under mild (at room temperature under air atmosphere) and operationally simple reaction conditions.
Production of an ester of one enantiomer of an .alpha.-amino acid in the
申请人:Glaxo Laboratories Limited
公开号:US03976680A1
公开(公告)日:1976-08-24
A process for the production of an ester of one enantiomer of an .alpha.-amino acid in the form of a salt with an optically active acid, which comprises reacting an ester of the opposite enantiomer of said .alpha.-amino acid (which may be in admixture with an ester of the desired enantiomer) with said optically active acid and an aldehyde or ketone, whereby an ester of the desired enantiomer separates out in the form of the said salt. The free .alpha.-amino acid and/or its salts may be obtained by hydrolysis of the ester thus formed. Optically active .alpha.-amino acids and their esters are of use in the synthesis of physiologically active compounds e.g. antibiotics of the penicillin and cephalosporin types. The present invention provides a relatively cheap, high yield process for the production of esters of optically active .alpha.-amino acids and for the production of optically active .alpha.-amino acids thereform. Certain novel compounds are disclosed.
OPTICALLY-ACTIVE 2-AMINO-PHOSPHONOALKANE ACID, OPTICALLY-ACTIVE 2-AMINOPHOSPHONOALKANE ACID SALT, AND HYDRATES OF THESE
申请人:NAHLS CORPORATION CO., LTD.
公开号:US20200131207A1
公开(公告)日:2020-04-30
A novel compound has pharmacological activities comparable to those of Nahlsgen and is storable excellently stably. The compound can be produced by a method according to the present invention for producing an optically active 2-amino-phosphonoalkanoic acid salt. In the method, a starting material DL-2-amino-phosphonoalkanoic acid represented by Formula (1) or a hydrate thereof is reacted with an optically active basic compound other than an optically active lysine, to give a diastereomeric salt mixture including a first salt (including a hydrate salt) between a D-2-amino-phosphonoalkanoic acid represented by Formula (1-1) and the optically active basic compound, and a second salt (including a hydrate salt) between an L-2-amino-phosphonoalkanoic acid represented by Formula (1-2) and the optically active basic compound. The diastereomeric salt mixture is fractionally crystallized to isolate one of the first and second diastereomeric salts.
The present invention relates to a crystalline form of an intermediate for cefoperazone of formula (1) and to a process for the preparation thereof by enzymatic condensation of a 3′-thiosubstituted β-lactam nucleus with a phenylglycine derivative.