Antidermatophytic activity of 2-thiotetrahydro-1,3,5-thiadiazines and isothiocyanates

Synthesis of New Functionalised Derivatives of [1,2,4]triazolo[4,3-a]Pyrimidine and Pyrimido[2,1-b][1,3,5]Thiadiazine as Aromatase Inhibitors

New functionalised 3,4-dihydropyrimido[2,1-b][1,3,5]thiadiazine-6,8-(2H,7H)-dione and [1,2,4]triazolo[4,3-a]pyrimidine-5,7-(1H,6H)-dione derivatives were synthesised through the reaction of thiobarbituric acid with aromatic amines and formaldehyde and from thiobarbituric acid and hydrazonoyl halides, respectively. The structures of the target compounds were confirmed by 1H NMR, IR and MS spectra. Moreover, the newly synthesised products were tested for their aromatase inhibition activities and the results obtained were promising compared with the drug letrozole, a non-steroidal aromatase inhibitor.

Design and synthesis of pyrido[2,1-b][1,3,5]thiadiazine library via uncatalyzed Mannich-type reaction

This Research Article describes the synthesis of an over 700-member library of (8R/8S)-3-R-8-aryl-6-oxo-3,4,7,8-tetrahydro-2H,6H-pyrido[2,1-b][1,3,5]thiadiazin-9-carbonitriles by uncatalyzed Mannich-type reaction of N-methylmorpholinium (4R/4S)-4-aryl-3-cyano-6-oxo-1,4,5,6-tetrahydropyridin-2-thiolates with a set of primary amines and excessive HCHO. The scope and limitations of the reaction were studied. Starting thiolates were obtained in yields of 53-82% by multicomponent reaction of aromatic aldehydes, cyanothioacetamide, 2,2-dimethyl-1,3-dioxane-4,6-dione (Meldrum's acid), and N-methylmorpholine, followed by heterocyclization of the resulting Michael adducts.