Über die Synthese von 4,9-Dihydro-9-(2-dimethylaminoäthyl)-4-methyl-thieno[3,4-b][1,5]benzodiazepin-10-on

The synthesis of the title compound6 c, starting with the condensation of o-phenylenediamine and methyl 4-oxotetrahydrothiophene-3-carboxylate (1) to 1.3.4.9-tetrahydrothieno3.4-b] 1.5]benzodiazepin-10-one (2), is described. The structures of other products of this condensation, 1.3-dihydro-1-3-(2.5-dihydrothienyl)]-benzimidazol-2-one (3) and 1.3-dihydro-1-3-(2.3-dihydrothienyl)]-benzimidazol-2-one (4), are confirmed by their¹H-NMR-spectra and by the¹H-NMR-spectra of their desulfurization products.