Synthesis of Some New l,3-Disubstituted-4,9-dithia-1,2,6-triazaspiro[4,4]nonan-2-ene-7-one: Site Selectivity in Reactions of Nitrilimines with Polyfunctional Dipolarophile

摘要

Some new 1,3-disubstituted-4,9-dithia-1,2,6-triazaspiro[4,4]nonan-2-ene-7-one (6, 9 and 11) were synthesized from the cycloaddition reaction of nitrilimines 2 to 3-phenyl-5-phenylmethylene-2-thtooxothiazolidine-4-one (1), 5-phenylmethylene-2-thiooxothiazolidine-4-one (7) and 3-phenyl-2-thiooxothiazolidine-4-one (8), respectively. The new compounds were characterized using IR, ~1H NMR, ~(13)C NMR and mass spectra.