Synthesis Of Glucosylamino Heterocycles By Desulfurization-Condensation Of Glucosyl Isothiocyanates With Jv-Substituted Amino Acids

Novel and efficient synthesis of 4-dimethylamino-2-glycosylaminoquinazolines by cyclodesulfurization of glycosyl thioureas with dimethylcyanamide

4-dimethylamino-2-glycosylaminoquinazoline derivatives were synthesized by cyclodesulfurization of N-aryl-N'-glycosyl thioureas with dimethylcyanamide in the presence of silver triflate in good yields.

A New Approach to Imidazo[1,5-a]indole Derivatives

Reaction of indole-2-carbonyl isothiocyanate (1) with sodium methanethiolate afforded 1-thioxo-1H-imidazo[1,5-a]indol-3(2H)-one (3). Its methylation with methyl iodide in the presence of lithium hydride in dimethylformamide, or potassium carbonate in acetone resulted in the formation of corresponding S- and N-methyl derivatives 4 and 5. N-(Indole-2-carbonyl)thiocarbamates and N-(indole-2-carbonyl)thioureas prepared by treatment of isothiocyanate 1 with corresponding nucleophilic reagents were S-methylated with methyl iodide in acetone in the presence of potassium carbonate. The obtained N-(indole- 2-carbonyl) substituted thiocarbonimidates 15, 16 and isothioureas 17-20 afforded by treatment with lithium hydride in dimethylformamide the derivatives of imidazo[1,5-a]- indol-3-one 23-28 in 49-87% yields. Antifungal activity of the prepared compounds has been examined, using the fungus Bipolaris leersiae. 1-Methylsulfanyl-3H-imidazo-[1,5-a]- indol-3-one (4) exhibited the highest antifungal activity.