Complete structural assignment in a series of thieno[3,4-b]quinoxalines by means of 2D NMR

The structure of pyrrolo ([4,5-b]-1′,2′,3′,4′-tetrahydroquinoxaline) [1,2,3-Im]- 1 - methyl - 3 - propyl - 1, 3, 3a, 4, 9, 9a - hexahydrothieno[3,4-b]quinoxaline 2,2-dioxide, isolated in the course of a study on a series of thieno[3,4,-b]quinoxalines, was assigned on the basis of a spectral 1H-13C correlated inverse chemical shift experiment.