New Methods for the Synthesis of 2-Aminothiazolones
摘要:
[GRAPHICS]Two new methods for the synthesis of 2-aminothiazolones from 2-(4-methoxybenzylthio)acetic acids are described. A single reagent and simple experimental conditions are used in the key tandem deprotection-cyclization process. In the first approach 2-aminothiazolones are directly accessed via cyclization of the corresponding N-acylisothioureas. The second complementary approach provides access to a variety of 2-thiomethylthiazoiones via cyclization of N-acyldithioimidates. The product 2-thiomethylthiazol ones are then efficiently converted to 2-aminothiazolones via amine displacement.
Guaiacol esters of mercaptopropionic acid derivatives, process for
申请人:——
公开号:US04299842A1
公开(公告)日:1981-11-10
Esters with guaiacol of alpha- and beta-mercaptopropionylalanine and of alpha- and beta-mercaptopropionylglycine, their preparation process and their therapeutic use as mucolytic agents, are disclosed.
[EN] SYNTHESIS OF CYCLIC PEPTIDES<br/>[FR] SYNTHESE AMELIOREE DE PEPTIDES CYCLIQUES
申请人:FERRING B.V.
公开号:WO1995001368A1
公开(公告)日:1995-01-12
(EN) A process for preparing and purifying cyclic peptides having disulfide moieties in a single processing operation which simplifies synthesis and reduces production costs, yet produces high yields of pure peptide obtained by isolating the desired cyclic compound through direct ion exchange chromatography as an integral part of the single process. The improved process is particularly useful for the preparation of vasopressin and oxytocin and their respective derivatives and analogs.(FR) Procédé de préparation et de purification de peptides cycliques comportant des fractions de bisulfure, dans le cadre d'un seul traitement qui simplifie la synthèse et réduit les coûts de production mais fournit, à haut rendement, des peptides purs en isolant le composé cyclique désiré par chromatographie d'échange direct d'ions faisant partie intégrante du procédé. Ce procédé amélioré est particulièrement utile à la préparation de vasopressine et d'oxytocine ainsi que de leurs dérivés et analogues respectifs.
Guaiacol esters of alpha- and beta-mercaptopropionylalanine and alpha- and beta-mercaptopropionylglycine, process for their preparation and pharmaceutical compositions containing same
Gualacol esters of alpha- and beta-mercaptopropionyl alanine and of alpha- and beta-mercaptopropionyl glycine having formulae:
wherein R is hydrogen or methyl and Y is hydrogen or an acyl radical (acetyl, benzoyl or methoxycarbonyl).
Pharmaceutical compositions containing these guaiacol esters have mucolytic activity.
The process for manufacturing these guaiacol esters comprises preparing in a known per se manner a sulhydryl group-containing intermediate wherein the sulfhydryl is protected by a trityl or p-methoxybenzyl group, and removing the protective group under acid conditions.
α-和β-巯基丙酰基丙氨酸以及α-和β-巯基丙酰基甘氨酸的愈创木酚酯,其化学式为
其中 R 是氢或甲基,Y 是氢或酰基(乙酰基、苯甲酰基或甲氧基羰基)。
含有这些愈创木酚酯的药物组合物具有粘液溶解活性。
制造这些愈创木酚酯的工艺包括以已知的本身方式制备含巯基的中间体,其中的巯基被三苯甲基或对甲氧基苄基保护,然后在酸性条件下去除保护基。
Vasopressin analogs, processes for their production and a method of treating mammals
申请人:Cort, Joseph H.
公开号:EP0029659A2
公开(公告)日:1981-06-03
Novel vasopressin analogs have the general schematic formula:
wherein X is selected from the group consisting of H and NH2 and Y is selected from the group consisting of -S-S-, -CH2Sand -SCH2- and A = L when B = D and A = D when B = L. They can be administered to increase the level of Factor VIII and plasminogen activator in a subject's blood. The 1-desamino-1- and 1-desamino-6-monocarba [9-D-Ala-NH2]-arginine-vasopressin analogs can be prepared by coupling a respective select group of amino acid residues in a predetermined sequence. Such a method includes the use of an amino acid residue which can be prepared by reacting beta-mercaptopropionic acid with 4-methylbenzyl bromine in the presence of triethylamine and a mutual solvent.