反应详情

A mixture of 2.55 parts of 1,4-dihydro-1-(2-iodoethyl)-4-methyl-5H-tetrazol-5-one, 3.45 parts of N-[4-(methoxymethyl)-4-piperidinyl]-N-phenylpropanamide, 2 parts of sodium carbonate, 0.2 parts of potassium iodide and 160 parts of 4-methyl-2-pentanone is stirred and refluxed overnight with water-separator. The reaction mixture is cooled, 100 parts of water are added and the layers are separated. The aqueous phase is extracted with dichloromethane. The combined organic phases are dried, filtered and evaporated. The residue is purified by column-chromatography over silica gel using a mixture of trichloromethane and methanol (97:3 by volume) as eluent. The pure fractions are collected and the eluent is evaporated. The residue is converted into the ethanedioate salt in 2-propanone. The salt is filtered off and crystallized from 2-propanone, yielding 2.1 parts (42%) of N-{1-[2-(4,5-dihydro-4-methyl-5-oxo-1H-tetrazol-1-yl)ethyl]-4-(methoxymethyl)-4-piperidinyl}-N-phenylpropanamide ethanedioate (1:1); mp. 155.9° C.

1. temperatureThe reaction mixture is cooled
2. customthe layers are separated
3. extractionThe aqueous phase is extracted with dichloromethane
4. customThe combined organic phases are dried
5. filtrationfiltered
6. customevaporated
7. customThe residue is purified by column-chromatography over silica gel using
8. additiona mixture of trichloromethane and methanol (97:3 by volume) as eluent
9. customThe pure fractions are collected
10. customthe eluent is evaporated
11. filtrationThe salt is filtered off
12. customcrystallized from 2-propanone