Sodium cyanoborohydride → HCID 19913707, compound

Participants

Reaction Steps

0.34 g of methyl 7-oxo-8-phenyl-7H-pyrido[1,2-b]thieno[2,3-d]pyridazine-10-carboxylate in 10 ml of formic acid are treated dropwise under argon at 25°-30° with 0.31 g of sodium cyanoborohydride in 2 ml of tetrahydro-furan. The mixture is left to stir at room temperature for 24 hours. The solution is poured into 50 ml of ice-water. The yellowish crystals are removed by filtration and washed with water. After drying in vacuo, recrystallization is carried out from ethyl acetate. There is obtained methyl 4,5-dihydro-5-methyl-7-oxo-8-phenyl-7H-pyrido[1,2-b]thieno-[2,3-d]pyridazine-10-carboxylate of m.p. 180°-181°.

Provenance & Evidence