SYNTHESIS AND PROPERTIES OF 14-SUBSTITUTED 1,4- THIAZINODIQUINOLINES
摘要:
4,4'-Dichloro-3,3'-diquinolinyl sulfide 1 reacted with aryl-, heteroaryl- and alkylamines in MEDG or phenol to Ii-substituted thiazino[2,3-c;6,5-c']diquinolines 2. Reaction with ammonia, ammonium carbonate or benzylamine led to unsubstituted thiazine 2a. Alkylation of thiazine 2a with alkyl halides gave 14-alkyl-I,4-thiazinodiquinolines 2b, 2c and 2f. The nature of the 14-substituent has a significant effect on H-1 NMR and MS spectral properties.
SYNTHESIS AND PROPERTIES OF 14-SUBSTITUTED 1,4- THIAZINODIQUINOLINES
摘要:
4,4'-Dichloro-3,3'-diquinolinyl sulfide 1 reacted with aryl-, heteroaryl- and alkylamines in MEDG or phenol to Ii-substituted thiazino[2,3-c;6,5-c']diquinolines 2. Reaction with ammonia, ammonium carbonate or benzylamine led to unsubstituted thiazine 2a. Alkylation of thiazine 2a with alkyl halides gave 14-alkyl-I,4-thiazinodiquinolines 2b, 2c and 2f. The nature of the 14-substituent has a significant effect on H-1 NMR and MS spectral properties.
Synthesis of quinoline/naphthalene-containing azaphenothiazines and their potent in vitro antioxidant properties
作者:Małgorzata Jeleń、Eugenia I. Bavavea、Maria Pappa、Angeliki P. Kourounakis、Beata Morak-Młodawska、Krystian Pluta
DOI:10.1007/s00044-014-1247-y
日期:2015.4
New tetracyclic and pentacyclic azaphenothiazines containing one or two quinoline rings instead of benzene rings were obtained in the original reactions of isomeric diquinodithiins, dichlorodiquinolinyl sulfides, and disulfide with aromatic amines. The type of ring fusion in the azaphenothiazine system was concluded from the H-1 NMR spectra. The obtained azaphenothiazines were evaluated in vitro for their antioxidant activity on rat hepatic microsomal membranes for protection of non-enzymatic lipid peroxidation promoted by the Fe2+/ascorbic acid redox system. Most compounds exhibited a very significant antioxidant activity with IC50 values between 1 and 23 mu M. The degree of antioxidant activity depends on the lipophilicity and molecular size as well as the (non)substitution of the thiazine nitrogen atom and type of ring system fusion. It is the first time to our knowledge that azaphenothiazines are shown to exhibit such potent antioxidant activity.