A method for esterification of one or more carboxylic acid groups in a compound containing one or more carboxylic acid groups wherein the esterification reagent is a diazo-compound of formula:
wherein the R1 and R2 groups of the diazo compound are selected such that the corresponding organic compound of formula:
exhibits a —C—H pKa value between 18 and 29 as measured in DMSO. Specific reagents and methods for esterification are provided. The esterification reagents provided exhibit high selectivity for esterification of carboxylic acid groups over reaction with amine, alcohol or thiol groups in the compound containing one or more carboxylic acid groups. The method can be used to selectively esterify carboxylic acid groups in peptides or proteins.
Microgranulés chargés en une substance active, constitués essentiellement d'un triglycéride d'acides gras saturés et leur utilisation par voie topique dans le domaine thérapeutique
申请人:CENTRE INTERNATIONAL DE
RECHERCHES DERMATOLOGIQUES GALDERMA - CIRD GALDERMA
公开号:EP0376852A1
公开(公告)日:1990-07-04
Microgranulés chargés en une substance thérapeutiquement active sur les désordres cutanés et fondant par application sur la peau.
Ils sont essentiellement formés, par granulation de ladite substance active, à l'aide d'au moins un triglycéride d'acides gras saturés ayant un point de fusion compris entre 30 et 50°C, lesdits microgranulés ayant un diamètre moyen compris entre environ 5µm et 800µm.
Ces microgranulés trouvent une application dans le traitement des désordres cutanés.
A method for esterification of one or more carboxylic acid groups in a compound containing one or more carboxylic acid groups wherein the esterification reagent is a diazo-compound of formula:
wherein the R
1
and R
2
groups of the diazo compound are selected such that the corresponding organic compound of formula:
exhibits a —C—H pKa value between 18 and 29 as measured in DMSO. Specific reagents and methods for esterification are provided. The esterification reagents provided exhibit high selectivity for esterification of carboxylic acid groups over reaction with amine, alcohol or thiol groups in the compound containing one or more carboxylic acid groups. The method can be used to selectively esterify carboxylic acid groups in peptides or proteins.
Versatile Palladium-Catalyzed Approach to Acyl Fluorides and Carbonylations by Combining Visible Light- and Ligand-Driven Operations
作者:Yi Liu、Cuihan Zhou、Meijing Jiang、Bruce A. Arndtsen
DOI:10.1021/jacs.2c01951
日期:2022.6.1
We describe the development of a general palladium-catalyzed carbonylative method to synthesize acyl fluorides from aryl, heteroaryl, alkyl, and functionalized organic halides. Mechanistic analysis suggests that the reaction proceeds via the synergistic combination of visible light photoexcitation of Pd(0) to induce oxidative addition with a ligand-favored reductive elimination. These together create