反应详情

To a stirred mixture of 1.21 g of 3-(N-benzyl-N-methylamino)methyl-5-cyanomethyl-1,2,4-oxadiazole prepared in Example 95 and 1.25 g of methyl 2-(3-nitrobenzylidene)acetoacetate in 10 ml of ethanol was added 0.1 ml of piperidine. The reaction mixture was heated under reflux for 3 hours and then concentrated in vacuo. The residue was triturated with 10 ml of ethyl acetate and the insoluble crystals were collected by filtration. Treatment of a solution of this base in chloroform with etherial hydrogen chloride afforded 820 mg of methyl 2-amino-3-[3-(N-benzyl-N-methylamino)methyl-1,2,4-oxadiazol-5-yl]-6-methyl-4-(3-nitrophenyl)-4H-pyran-5-carboxylate as pale yellow powder, m.p. 201.5° C. (decomp.).

1. temperatureThe reaction mixture was heated
2. temperatureunder reflux for 3 hours
3. concentrationconcentrated in vacuo
4. customThe residue was triturated with 10 ml of ethyl acetate
5. filtrationthe insoluble crystals were collected by filtration