The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Cyclization of condensed [1,2,4]triazolo[4,3-b]pyridazine-3(2H)-6(5H)-ones with α,ω-dibromoalkanes afforded a series of novel ring systems including zwitterions and isomeric tetracyclic lactams. The product distribution is controlled by the chain-length of the reagent, the polarity of the solvent and the structure of ring A in the substrate. The observed substrate selectivity was interpreted on the...
BF 3 OEt 2 -catalyzed reaction of chalcones (2) with imidazolidine-2-thione (1) yielded 2,3-dihydro-5,7-diaryl-7H-imidazo[2,1-b][1,3]thiazines (3). The structure of the compounds was confirmed by MS, X-ray and NMR studies. Ab initio and semiempirical theoretical calculations were carried out to corroborate experimental findings concerning the possible conformations of the products.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.