Water → (+/-)-ethyl alpha-ethyl-4,5-dihydro-4-[4-[4-(4-methoxyphenyl)-1-piperazinyl]phenyl]-5-oxo-1H-1,2,4-triazol-1-acetate

Participants

Reaction Conditions

Reaction Steps

A mixture of 2,4-dihydro4-[4-[4-(4-methoxyphenyl)-1-piperazinyl]phenyl]-3H-1,2,4-triazol-3-one (0.05 mol), 2-bromo-butanoic acid ethyl ester (0.055 mol) and Na2CO3 (0.15 mol) in 1-methyl-2-pyrrolidinone (250 m1) was stirred at 75° C. over 2-Bromobutanoic acid ethyl ester (0.015 mol) was added again. The mixture was stirred at 75° C. for 6 hours, at room temperature for 48 hours, poured out into H2O and stirred for 30 minutes. The precipitate was filtered off and dissolved in CH2Cl2. The solution was filtered. The filtrate was dried, filtered and the solvent was evaporated. The residue was triturated in diisopropylether and ethylacetate, filtered off and dried, yielding 10 g (43%) of (±)-ethyl α-ethyl-4,5-dihydro-4-[4-[4-(4-methoxyphenyl)-1-piperazinyl ]phenyl]-5-oxo- 1H-1,2,4-triazol-1-acetate (interm. 1).

Provenance & Evidence