The present invention provides novel N-substituted fluorooxindoles having the general Formula I
wherein the wavy bond
represents the racemate, the (R)-enantiomer or the (S)-enantiomer and m, n, p, q, A, B, D, Q, X, and Z are as defined below, or a nontoxic pharmaceutically acceptable salt or solvate thereof and are useful in the treatment of disorders which are responsive to the opening of potassium channels.
N-protected alanine esters with LDA, and subsequent addition of various metal salts, most likely results in the formation of chelated metal enolates. Aldol reactions of these enolates with aldehydes afford the anti isomers of α-methyl α-amino-β-hydroxy acid derivatives in a highly diastereoselectiv fashion. Best results are obtained with tin enolates of N-sulfonylated alanine esters, which give excellent
Polyol-amino acid compounds having anti-helicobacter pylori activity
申请人:Takeda Chemical Industries, Inc.
公开号:US06423869B1
公开(公告)日:2002-07-23
A compound of the formula (I):
wherein R1 represents an amino group which may be substituted; R2 represents a carboxy group which may be esterified or amidated; R3, R4, R5 and R6 each represent a hydroxy group which may be protected; Q represents an aryl group which may be substituted; or a salt thereof is disclosed. The compound (I) possesses ant-Helicobacter pylori activity, and is useful in the prevention or treatment of various diseases associated with Helicobacter bacteria, such as duodenal ulcer, gastric ulcer, chronic gastritis and cancer of the stomach.
Studies on Separation of Amino Acids and Related Compounds. V. A Racemization Test in Peptide Synthesis by the Use of an Amino Acid Analyzer
作者:Nobuo Izumiya、Masako Muraoka、Haruhiko Aoyagi
DOI:10.1246/bcsj.44.3391
日期:1971.12
residues are DL-alanine, L-valine, L-leucine, L-phenyl-alanine, L-proline, and L-serine have been synthesized and the separation of each glycyltripeptide diastereomers by an aminoacid analyzer have been studied. Among six peptides studied, diastereomeric mixtures of H-Gly-DL-Ala-L-Val-OH and H-Gly-DL-Ala-L-Leu-OH were separated completely. A procedure to determine the amounts of LL and DL diastereomer
Untersuchungen über die Kinetik der Spaltung von Di- und Tripeptiden
作者:H. Hartmann.、J. Heintges、H. Jung、J. Heidberg
DOI:10.1515/znb-1962-0301
日期:1962.3.1
Arrhenius sehen Aktivierungsenergien und Aktionskonstanten der alkalischen Hydrolyse einer Reihe von Di- und Tripeptiden. Die zur Gewinnung der kinetischen Daten führende quantitative Analyse der Hydrolysate gelang, indem die Peptide vor ihrer Hydrolyse geeignet mit 14C markiert, die Hydrolysate mit Hilfe der Papierchromatographie bzw. der Zonenelektrophorese getrennt und die isolierten Hydrolyseprodukte
Wir ermittelten die Geschwindigkeitskonstanten sowie die Arrhenius sehen Aktivierungsenergien und Aktionskonstanten deralkalischen Hydrolyse einer Reihe von Di- und Tripeptiden。Die zur Gewinnung der kinetischen Daten führende 定量分析 der Hydrolyzate gelang, indem die Peptide vor ihrer Hydrolyse geeignet mit 14C markiert, die Hydrolyzate mit Hilfe der Papierchromatographie bzw。der Zonenelektrophorese getrennt