Facile synthesis of new thiazinanones derived by acenaphythylenone

In an attempt to develop new thiazinanones, 2-oxoacenaphthylen-1(2H)-ylidene)hydrazineylidene)-5,6-diphenyl-1,3-thiazinan-4-ones were synthesized via the reaction of oxoacenaphthylen-hydrazinecarbothioamide derivatives with 2,3-diphenylcycloprop-2-enone in ethanol and catalyzed by triethyl amine. The structure of the obtained thiazinanones was elucidated by spectral data (IR, MS, ¹H and ¹³C NMR spectra) in addition to elemental analysis. The mechanism describes the reaction pathway was also discussed.