Synthesis of 3?-1,2,4-triazolo- and 3?-1,3,4-thiadiazoliminothymidines

Thiosugar nucleosides. Synthesis and biological activity of 1,3,4-thiadiazole, thiazoline and thiourea derivatives of 5-thio-D-glucose

New acylated 5-thio-beta-D-glucopyranosylimino-disusbstituted 1,3,4-thiadiazols 8, and 11 were prepared, via spontaneous rearrangements, by cycloaddition of the glycosyl isothiocyanate 2 with the reactive intermediates 1-aza-2-azoniaallene hexachloroantimonates 4 and 6, respectively. Reaction of 2 with aminoacetone or chloroethylamine afforded the acylated 5-thio-beta-D-glucopyranosyl-4-imidazoline-2-thione nucleoside 16 and glucopyranosylamino-2-thiazoline derivative 18, respectively. Deblocking of 8, 11, 17 and 19 furnished the free nucleoside analogues 9, 12, 18 and 20, respectively. Analogously, treatment of 2 with chloroethylamine in the 1:2 ratio afforded the thioureylendisaccharide 21. No in vitro antiviral activity against HIV-1, HIV-2, human cytomegallovirus (HMCV), has been found for the new synthesized compounds.

Synthesis, antitumor and antiviral properties of some 1,2,4-triazole derivatives

A series of 1,5-dialkyl-1,2,4-triazole derivatives of acetic acid alkylidene hydrazides 8-12, the acid 13, 1,5-dialkyl-3-(5-mercapto-4-N-aryl-1H-[1,2,4]-triazol-3-ylmethylene)-1H-[1,2,4] triazoles 14-16, their 1,3,4-oxadiazole analogues 17-21, as well as the 1,2,4-triazolo-indoles 25 and 27 were prepared. The Z/E conformations of some acetic acid alkylidene derivatives were studied by NMR spectroscopy. Most of the target compounds were evaluated in a series of human cancer cell in cultures and none have shown activity except 25 which exhibited remarkable activity against nine cancer types. No in vitro antiviral activity against HIV-1, HIV-2, HSV-1, HSV-2, SV, CV-B4, RSV, P3V, RV, SinV, PTV has been found for all the synthesized compounds.

DNA-directed alkylating agents: synthesis, antitumor activity and DNA affinity of bis-N,N′-trisubstituted 1,2,4-triazolo-piperazines

A series of 1,4-bis-(1,5-dialkyl-1H-1,2,4-triazol-ylmethyl)piperazines and N-methyl-piperazine analogs were prepared spontaneously from the cycloaddition of various reactive cumulenes with the piperazino-1,4-(bis-ethanenitrile) and 1-cyanomethyl-4-methyl-piperazine, respectively. The new compounds were evaluated for their DNA affinity and antitumor activity.