CORTICOID-17,21-DICARBOXYLIC ESTERS AND CORTICOSTEROID 17-CARBOXYLIC ESTER 21-CARBONIC ESTERS, PROCESSES FOR THEIR PREPARATION AND PHARMACEUTICALS CONTAINING THESE COMPOUNDS
申请人:——
公开号:US20020103392A1
公开(公告)日:2002-08-01
Corticoid 17,21-dicarboxylic esters and corticosteroid 17-carboxylic ester 21-carbonic esters, processes for their preparation and pharmaceuticals containing these compounds
Corticoid 17,21-dicarboxylic esters and corticoid 17-carboxylic ester 21-carbonic esters of the formula I
1
are described, in which A is CHOH and CHCl, CH
2
, C═O or 9(11) double bond; Y is H, F or Cl; Z is H, F or methyl; R(1) is aryl or hetaryl; R(2) is alkyl and R(3) is H or methyl. They are obtained, inter alia, by reacting a compound of the formula II,
2
in which R(5) is OH, with an activated carboxylic acid of the formula III,
R(6)—CO—(O)
n
[(C
1
-C
4
)-alkyl]
m
-R(1) III.
They have a very strong local and topical antiinflammatory action and exhibit a very good ratio of local to systemic antiinflammatory effects. They are used, inter alia, as agents for treating inflammatory dermatoses.
Nickel-Catalyzed Three-Component Reductive Alkylacylation of Electron-Deficient Activated Alkenes
作者:Lin Wang、Chuan Wang
DOI:10.1021/acs.orglett.0c03210
日期:2020.11.20
alkylacylation of electron-deficient activated alkenes with tertiary alkyl bromides and acid anhydrides. This method enables the efficient preparation of a variety of ketones with broad substrate scope and high functionality tolerance starting from simple precursors. On the basis of the preliminary mechanistic investigations, a catalytic cycle involving the synergistic interaction of nickel, zinc, and MgCl2
Synthesis of Aryl Amides from Acyl-Bunte Salts and Aryl Azides
作者:Li-Jia Chen、Chia-Jou Kuo、Chien-Fu Liang
DOI:10.1021/acs.joc.3c00477
日期:2023.8.4
In this study, we developed an efficient method for the synthesis of aryl amides from sodium thiosulfate pentahydrate, organic anhydrides, and aryl azides. Sodium thiosulfate may be used as the sulfur source, which reacts with anhydrides to generate acyl-Bunte salt; this salt reacts with aryl azides via the in situ generation of thiocarboxylate. Using our method, we successfully synthesized a key bioactive