Published in Zeitschrift für Naturforschung B
A variety of new polyfunctionally substituted pyridines, naphthopyrans and pyrazolopyrimidines were prepared via reacting ylidenemalononitriles with thiophenol, thionaphthol, naphthols and or aminopyrazoles.
Single-stranded M13mp18 phage DNA was methylated with dimethylsulfate (DMS), and further treated with alkali to ring-open N7-methylguanine residues and yield 2-6-diamino-4-hydroxy-5N-methylformamidopyrimidine (Fapy) residues. Nucleotide incorporation during in vitro DNA synthesis on methylated template using E. coli DNA polymerase Klenow fragment (...
In contrast to thymine and 5-fluorouracil (FUra) which were cleared from the bloodstream within 2-4 h after their i.p. administration (200 mumol/kg) to rat, (E)-5-(2-bromovinyl)uracil (BVUra) maintained a concentration of 50-70 microM for at least 6 h and was still present in the plasma 24 h after its administration. In vitro experiments with rat l...
Published in Zeitschrift für Naturforschung B
In the presence of alkali and LAuCl one or two -NH - groups of a purine or pyrimidine base can be transformed into - N(AuL)- groups giving stable and soluble compounds containing one or two two-coordinated gold(I) nuclei; mononuclear LAu - Q' or binuclear LAu - Q - AuL with a monodentate Q'- or an exobidentate O-- ligand, resp. (Q'H = adenine, guan...
Published in Zeitschrift für Naturforschung C
Hydrogen atoms from the radiolysis of water at pH 1.6 add to the 5,6-double bond of pyrimidines. The preferential site of attack is the C(5) position (values in brackets) in the case of 6-methyluracil (87%), 1,3-dimethyluracil (71%), uracil (69%) and poly(U) (60%). This reaction yields a radical of reducing properties which can be monitored by its...
Published in Zeitschrift für Naturforschung B
2-Mercapto-4-amino-5-cyano-6-arylpyrimidines (1a, b), 2-hydroxy derivatives 1c, d and 2-methylmercapto derivatives 4 a, b were synthesised via the reaction of either a mixture of malononitrile and aromatic aldehyde or arylidene malononitrile with thiourea, urea and S-methylisothiourea, respectively. 1c, d could also be obtained by the action of hyd...
