N-(2-hydroxy-1,1-dimethylethyl)-N'-[4-[4-(4-methoxyphenyl)-1-piperazinyl]phenyl]thiourea → 4,5-dihydro-N-[4-[4-(4-methoxyphenyl)-1-piperazinyl]phenyl]-4,4-dimethyl-2-thiazolamine

Participants

Reaction Conditions

Reaction Steps

A mixture of 74 parts of N-(2-hydroxy-1,1-dimethylethyl)-N'-[4-[4-(4-methoxyphenyl)-1-piperazinyl]phenyl]thiourea and 360 parts of formic acid was stirred for 4 hours at 70° C. The reaction mixture was evaporated and the residue was dissolved in 260 parts of dichloromethane. The whole was neutralized with a sodium hydrogen carbonate solution. The precipitated product was filtered off, washed with water and dichloromethane and purified by column chromatography over silica gel using a mixture of trichloromethane and methanol, saturated with ammonia, (99:1 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was crystallized from 4-methyl-2-pentanone. The product was filtered off and dried, yielding 44.1 parts (62.4%) of 4,5-dihydro-N-[4-[4-(4-methoxyphenyl)-1-piperazinyl]phenyl]-4,4-dimethyl-2-thiazolamine; mp. 232.0° C. (int. 8).

Provenance & Evidence