Bromine → methyl 2-bromo-4,5-dihydro-7-oxo-8-phenyl-7H-thieno[2,3-a]quinolizine-10-carboxylate

Participants

Reaction Steps

1.8 g of methyl 4,5-dihydro-7-oxo-8-phenyl-7H-thieno[2,3-a]quinolizine-10-carboxylate are dissolved in 32 ml of chloroform, whereupon the solution was treated at 0° with 0.55 ml of bromine in 1 ml of chloroform and stirred at room temperature overnight. After washing with 2N sodium hydroxide solution and saturated sodium chloride solution, drying over magnesium sulfate and evaporation, the residue in toluene/ethyl acetate (4:1) was chromatographed on silica gel. There was obtained pure methyl 2-bromo-4,5-dihydro-7-oxo -8-phenyl-7H-thieno[2,3-a]quinolizine-10-carboxylate of m.p. 170.5°-171° (from isopropanol).

Provenance & Evidence