N-Unsubstituted Sulfenamides by Electrophilic Amination of mercapto compounds
摘要:
Potential mercapto compounds derived from electron deficient heterocycles as 2- and 4-thiouracils, pyridines and pyridine-1-oxide are aminated by the oxaziridine 1 to new sulfenamides (6, 9, 11 and 15 or the isothiazolo-pyridine 14) which add to phenylisocyanates forming sulfenylureas (7, 10, 12 and 16). Several other mercapto compounds gave disulfides. Attempts of oxidation of the sulfenamides and the sulfenylureas were unsuccessful. The methylmercapto compound 19 after amination was hydrolyzed to the sulfoxide 20.
We developed an electrochemicaltrifluoromethylation of thiophenols without the use of metal catalysts and oxidants. This reaction features mild reaction conditions, readily available substrate, as well as moderate to good yields. In addition, this protocol can be easily scaled up with moderate efficiency.
Starting from a 3D-model for the antineoplastic activity of diarylsulfonylureas several new features were proposed and tested. Both types of assayed compounds, the N-(2-pyridylsulfonyl)urea and N-(2-pyridylsulfenyl)urea derivatives, inhibited by 50% the growth of the CCRF-CEM cell line at a dosage near to 1 microM. The N -(2-pyrimidinyl) derivative of the sulfenylurea 6c showed a better profile against