Biomedical subjects
Publications and source records attributed to I L Plikhtiak.
A synthesis of the derivatives of bis(indolyl)furan and bis(indolyl)pyrrole, which contain an acyclic fragment or a residue of D-ribo-, D-xylo-, L-arabino-, D-galactopyranose, or D-lactose was described. Bis(indole) aglycone was created using 1-glycosylindoles, which were synthesized by the indoline-indole method.
The reaction of 5'-amino-2',5'-dideoxyuridine and 5'-amino-5'-deoxy-2',3'-O-ethoxymethyliden-6- azauridine with 3-(3-indolyl)propionic or 1-nitroanthraquinon-2-carboxylic acids in THF in the presence of 2-ethoxy-1-ethoxycarbonyl-1,2-dihydroquinoline (EEDQ) resulted in the corresponding amide derivatives. The reaction conditions of the standard procedure for the removal of the O-alkylidene protecting group turned out to be too severe for the 5'-N-acylamide derivatives of 6-azauridine. 5'-Deoxy-5'-[3-(3-indolyl)propionyl-amino]-6-azauridine was synthesized from 5'-amino-5'-deoxy-6-azauridine and 3-(3-indolyl)propionic acid in THF in the presence of EEDQ. A reaction between 5'-O-tosyl-2',3'-O-ethoxymethyliden-6-azauridine and 3-aminopropanol gave 3-(3-hydroxypropylamino)-2-(2',3'-O-ethoxymethylidene-beta- D-ribofuranosyl)-as-triazine-5(2H)-one, the structure of which was confirmed also by synthesis from O2,5'-anhydronucleoside and 3-aminopropanol followed by further chemical transformations. A reaction of 3-(3-hydroxypropylamino) derivative obtained with nicotinoyl chloride prepared in situ, or with 1-nirtoanthraquinon-2-carboxylic acid in the presence of DCC with subsequent deprotection, afforded 3-[(3-pyridin-3-ylcarboxy)propylamino]- or 3-[3-(1-nitroanthraquinon-2-carboxy)propylamino]-2-beta-D-ribof ura nosyl-as- triazine-5(2H)-one, respectively. Structures of the nucleosides prepared were examined by 1H NMR spectroscopy. 2',5'-Dideoxy-5'-[(1-nitroanthraquinon-2-carbonyl)amino]uridine at a 10(-4) M concentration was shown to inhibit thymidine incorporation into cell DNA (CE50 10(-5) M) by 72%.
Interaction of nicotinoyl chloride in situ with 2'-deoxyuridine, its 3'-O-acetyl-, or 5'-O-trityl derivatives led to 3'-O-nicotinoyl-, 5'-O-nicotinoyl-, 3',5'-di-O-nicotinoyl-, and N3,3'-di-O-nicotinoyl-2'-deoxyuridine. Similarly, 5'-O-nicotinoyl-6-azauridine resulted from the reaction of 2',3'-O-ethoxymethylidene-6-azauridine followed by the deprotection. Reaction of 5'-amino-5'-deoxy-2',3'-O-ethoxymethylidene-6-azauridine with nicotinic acid in the presence of 2-ethoxy-1-ethoxycarbonyl-1,2-dihydroquinoline followed by the cleavage of the 2',3'-O-protecting group gave 5'-deoxy-5'-nicotinamido-6-azauridine. The same compound was obtained from 5'-amino-5'-deoxy-6-azauridine and N-succinimidyl nicotinate. Structures of the compounds obtained were corroborated by 1H NMR spectra. It is shown that 3',5'-di-O-nicotinoyl-2'- deoxyuridine and 5'-deoxy-5'-O-nicotinamido-6-azauridine are cytotoxic toward CaOv cells in vitro (CE50 10(-5) M).
New derivatives of 2-C-/(indolyl-3)methyl/-beta-L-threo-L-glycero-3-hexulofuranosono- 1,4-lactone, vis. 1'-ethylascorbigen, 1'-benzylascorbigen and 1',2'-dimethyl-5'-methoxyascorbigen were obtained. In aquous solutions at physiological temperature and pH values ascorbigens disintegrate rather rapidly to yield L-ascorbic acid, the rate of the latter's formation depending on the substituent in the indole nucleus and increasing with growth of pH and temperature. Intraperitoneal injection of 1'-methylascorbigen to mice leads to steady rise of L-ascorbic acid level in blood plasma.
A synthesis of 3-(1H-3-indolyl)-4-(1-glycosyl-3-indolyl)furan-2,5-diones and -1H-pyrrole-2,5-diones modified with the residues of D-ribo-, D-xylo-, L-arabino-, D-galactopyranose, and D-lactose was described. Influence of the compounds prepared on DNA biosynthesis in CaOv cells was studied.