HCID 23282476, compound → HCID 70126041, compound

Participants

Reaction Steps

To a solution of 2-(2-hydroxyethyl)-8-nitro-2,3,4,5-tetrahydro-1H-2-benzazapine hydrochloride (1.51 g, 5.54 mmol) in ethanol (100 ml) was added 10% Pd--C (0.2 g) and the solution was hydrogenated at 50 psi for 2 h. The reaction mixture was filtered and the filtrate was concentrated to give an oil. Evaporation with absolute ethanol gave 2-(2-hydroxyethyl)-2,3,4,5-tetrahydro-1H-2-benzazapin-8-amine hydrochloride as an amorphous solid (1.70 g, 110%) which was used without further purification. A solution of this salt (1.64 g, corrected to 1.50 g, 5.37 mmol) and S-methyl-2-thiophenethiocarboximide hydroiodide (1.91 g, 6.71 mmol) in N-methylpyrrolidinone (8.0 ml) was heated at 45° C. for 6 h. The reaction mixture was poured into water, basified, and extracted with dichloromethane. The dried (magnesium sulfate) organic phase was concentrated to give an oil. Column chromatography on silica gel, using 2% methanol in chloroform saturated with ammonia to 10% methanol in chloroform as eluent, gave a yellow oil (1.69 g, 100%). This oil (1.02 g, 3.23 mmol) was dissolved in ethanol and fumaric acid (0.82 g, 7.91 mmol) was added and the solution was heated at reflux for 0.5 h. Upon cooling, the product was collected to give the monofumarate salt (0.68 g), m.p. 172-4° C.

Provenance & Evidence